event-codec: integrate Phase 1 publication artifact - lib

commit 88f8731ac249a09f0d9c4ae911fe0da9fc989a52
parent 4d335832d005e29c675b6109be91eb7eec6cfa0f
Author: triesap <tyson@radroots.org>
Date:   Wed, 22 Jul 2026 04:23:25 +0000

event-codec: integrate Phase 1 publication artifact

- seal Profile and five Phase 1 root publications behind strict authored constructors
- persist exact drafts, authors, Blossom media inventory, and domain-separated digests
- freeze the corrected raw-source predecessor without changing registry v7
- bind canonical vectors and generated authority to the corrected integration base

Diffstat:
M CHANGELOG.md  | 13 +++++++++++++
A contracts/conformance/vectors/publication/phase1_artifact.v1.json  | 335 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M contracts/operations.toml  | 252 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M contracts/releases/1.0.0-alpha.1.toml  | 11 +++++++++++
M crates/event_codec/Cargo.toml  | 2 +-
M crates/event_codec/README  | 23 +++++++++++++++++++++++
A crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.json  | 2387 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json  | 493 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.sha256  | 1 +
M crates/event_codec/src/lib.rs  | 2 +-
M crates/event_codec/src/wire.rs  | 3 +++
A crates/event_codec/src/wire/publication.rs  | 1596 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M crates/event_codec/tests/codec_error_job.rs  | 13 +++++++++++++
A crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json  | 335 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A crates/event_codec/tests/publication_artifact.rs  | 936 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M tools/xtask/src/contract.rs  | 24 +++++++++++++++++++++---
M tools/xtask/src/contract/nip09_reconciliation.rs  | 38 +++++++++++++++++++++++++++++++++++++-
A tools/xtask/src/contract/phase1_publication_artifact.rs  | 1819 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M tools/xtask/src/contract/raw_source_rebuild.rs  | 31 +++++++++++++++----------------
M tools/xtask/src/main.rs  | 19 +++++++++++++++++++

20 files changed, 8311 insertions(+), 22 deletions(-)
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -171,6 +171,19 @@ publish policy both pass for the same source revision.
   The executable raw-rebuild successor contract freezes the SourceMaintenance
   predecessor and the `0001` through `0004` migration inventory; no schema
   migration is added.
+<!-- release-change: phase1-publication-artifact -->
+- The `serde_json` event-codec surface now exposes a sealed Phase 1 publication
+  artifact constructed only from strict authored Profile, Update, PhotoUpdate,
+  Ask, date/time Event, and FoodAvailability models. The exact version-1
+  envelope places the expected NIP-01 id at top level after the frozen draft,
+  exposes only explicit canonical-byte encode/decode operations, and binds all
+  fields except the digest under an ASCII-domain, single-NUL SHA-256 preimage.
+  Construction and reload enforce the 2 MiB artifact, 256 KiB signed-event,
+  and 4,096-reference bounds plus complete case-preserving Blossom URL
+  commitments. Strict reload rejects unknown or duplicate fields, alternate
+  encodings, cross-profile promotion, stale identifiers, media drift, and
+  digest tampering without claiming restored byte verification, upload
+  completion, signature authenticity, or signer authority.
 - Bare-envelope replica ingestion is quarantined behind the explicit,
   non-default `legacy-ingest` feature. Default replica APIs expose emit and sync
   surfaces only; a future product ingest boundary must consume a store-produced
diff --git a/contracts/conformance/vectors/publication/phase1_artifact.v1.json b/contracts/conformance/vectors/publication/phase1_artifact.v1.json
@@ -0,0 +1,335 @@
+{
+  "suite": "phase1_publication_artifact",
+  "contract_version": "1.0.0",
+  "vectors": [
+    {
+      "id": "profile_round_trip",
+      "kind": "publication_artifact.build_profile.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "semantic_variant": "profile",
+        "operation_id": "profile.build_authored_draft",
+        "contract_id": "radroots.profile.metadata.v1",
+        "event_kind": 0,
+        "media_count": 2,
+        "expected_event_id": "a7d081b9c142e3a68245bafe1921b0e0dd88f886406e7165a9729f6c57026289",
+        "artifact_digest": "e296ed63312d58b4e3ee160d4ca3457eb922920d3116329ca498f08e402215b0",
+        "canonical_json_bytes": 1305,
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"profile\",\"authored_operation_id\":\"profile.build_authored_draft\",\"event_contract_id\":\"radroots.profile.metadata.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":0,\"tags\":[],\"content\":\"{\\\"name\\\":\\\"victoria-farm\\\",\\\"display_name\\\":\\\"Victoria Farm\\\",\\\"about\\\":\\\"Seasonal produce from the Saanich Peninsula\\\",\\\"picture\\\":\\\"https://media.example/512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a.png\\\",\\\"banner\\\":\\\"https://media.example/fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145.webp\\\",\\\"nip05\\\":\\\"farm@example.com\\\",\\\"bot\\\":false}\"},\"expected_event_id\":\"a7d081b9c142e3a68245bafe1921b0e0dd88f886406e7165a9729f6c57026289\",\"media_references\":[{\"url\":\"https://media.example/512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a.png\",\"sha256\":\"512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a\",\"size\":15,\"media_type\":\"image/png\"},{\"url\":\"https://media.example/fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145.webp\",\"sha256\":\"fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145\",\"size\":14,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"e296ed63312d58b4e3ee160d4ca3457eb922920d3116329ca498f08e402215b0\"}"
+      }
+    },
+    {
+      "id": "update_round_trip",
+      "kind": "publication_artifact.build_update.valid",
+      "input": { "fixture": "update" },
+      "expected": {
+        "semantic_variant": "update",
+        "operation_id": "social.update.build_authored_draft",
+        "contract_id": "radroots.social.update.v1",
+        "event_kind": 1,
+        "media_count": 0,
+        "expected_event_id": "7f2d9dbbd6d2f3db1e83338ea2e669b2458e62ded159de15a3fa98dcf9f164e3",
+        "artifact_digest": "9ad318496bd4a710fbc7f3e0f6d5a01de808d352db91ca56a12e710904784cc5",
+        "canonical_json_bytes": 525,
+        "canonical_json_sha256": "21be0d18a7f5812f7fa14600f46e0948480d2525eb1dcab416bb4ef99ca731c6",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"update\",\"authored_operation_id\":\"social.update.build_authored_draft\",\"event_contract_id\":\"radroots.social.update.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[],\"content\":\"Carrots harvested today\"},\"expected_event_id\":\"7f2d9dbbd6d2f3db1e83338ea2e669b2458e62ded159de15a3fa98dcf9f164e3\",\"media_references\":[],\"artifact_digest\":\"9ad318496bd4a710fbc7f3e0f6d5a01de808d352db91ca56a12e710904784cc5\"}"
+      }
+    },
+    {
+      "id": "photo_update_round_trip",
+      "kind": "publication_artifact.build_photo_update.valid",
+      "input": { "fixture": "photo_update" },
+      "expected": {
+        "semantic_variant": "photo_update",
+        "operation_id": "social.photo_update.build_authored_draft",
+        "contract_id": "radroots.social.photo_update.v1",
+        "event_kind": 1,
+        "media_count": 2,
+        "expected_event_id": "e592229776cd2a0d0e25a701f4629c0a5dc6e08481a235623d50da6ee8e8f438",
+        "artifact_digest": "9ed6b7a6fcec3b07bd0c9179fd5b6ecf74517390051e3c2bd1659be62a26c197",
+        "canonical_json_bytes": 1415,
+        "canonical_json_sha256": "38caab5242ae70fe2e36b39658dba7e6f723b2bd4fa512c8f166387c17faf69c",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"photo_update\",\"authored_operation_id\":\"social.photo_update.build_authored_draft\",\"event_contract_id\":\"radroots.social.photo_update.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[[\"imeta\",\"url https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"x 51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"m image/webp\",\"dim 1200x900\",\"size 13\",\"alt Fresh strawberries\",\"fallback https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"]],\"content\":\"Strawberries at the farm stand https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"},\"expected_event_id\":\"e592229776cd2a0d0e25a701f4629c0a5dc6e08481a235623d50da6ee8e8f438\",\"media_references\":[{\"url\":\"https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"},{\"url\":\"https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"9ed6b7a6fcec3b07bd0c9179fd5b6ecf74517390051e3c2bd1659be62a26c197\"}"
+      }
+    },
+    {
+      "id": "ask_round_trip_with_fallback",
+      "kind": "publication_artifact.build_ask.valid",
+      "input": { "fixture": "ask" },
+      "expected": {
+        "semantic_variant": "ask",
+        "operation_id": "social.ask.build_authored_draft",
+        "contract_id": "radroots.social.ask.v1",
+        "event_kind": 1,
+        "media_count": 2,
+        "expected_event_id": "bd45fbbb5bfb8a5aa32df81d240e5f3bd56b0f8cde3a20b3f7d455801373fe48",
+        "artifact_digest": "41eddea199bba97adebef4ce433ebfa05d97978ce8464ed3d52762ab717c2a3c",
+        "canonical_json_bytes": 1411,
+        "canonical_json_sha256": "4985ad0919758e3747f0548409854deb77b9734825ab597623e5c6b566e2d5c7",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"ask\",\"authored_operation_id\":\"social.ask.build_authored_draft\",\"event_contract_id\":\"radroots.social.ask.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[[\"t\",\"radroots-ask\"],[\"imeta\",\"url https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"x 51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"m image/webp\",\"dim 1200x900\",\"size 13\",\"alt Fresh strawberries\",\"fallback https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"]],\"content\":\"When will strawberries be ready? https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"},\"expected_event_id\":\"bd45fbbb5bfb8a5aa32df81d240e5f3bd56b0f8cde3a20b3f7d455801373fe48\",\"media_references\":[{\"url\":\"https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"},{\"url\":\"https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"41eddea199bba97adebef4ce433ebfa05d97978ce8464ed3d52762ab717c2a3c\"}"
+      }
+    },
+    {
+      "id": "event_date_round_trip",
+      "kind": "publication_artifact.build_calendar_date_event.valid",
+      "input": { "fixture": "event_date" },
+      "expected": {
+        "semantic_variant": "event_date",
+        "operation_id": "social.calendar_date_event.build_authored_draft",
+        "contract_id": "radroots.calendar.date_event.v1",
+        "event_kind": 31922,
+        "media_count": 1,
+        "expected_event_id": "bea82662b6acf2f1272c8335a24bb0957e35d22c2b29d3e30c094ad7398dc7c7",
+        "artifact_digest": "0ec5162ab80988999aac62329d4cfc9c7efce6a82bbda539a723347d73596eb3",
+        "canonical_json_bytes": 1013,
+        "canonical_json_sha256": "46b015e34556762f3d7ca592cd3dc6d4d5652ff085c7d8a8dc458d5897cf0b22",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"event_date\",\"authored_operation_id\":\"social.calendar_date_event.build_authored_draft\",\"event_contract_id\":\"radroots.calendar.date_event.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":31922,\"tags\":[[\"d\",\"farmers-market-2026\"],[\"title\",\"Moss Street Farmers Market\"],[\"start\",\"2026-07-25\"],[\"end\",\"2026-07-26\"],[\"location\",\"Victoria, BC\"],[\"image\",\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\"]],\"content\":\"Saturday market in Victoria\"},\"expected_event_id\":\"bea82662b6acf2f1272c8335a24bb0957e35d22c2b29d3e30c094ad7398dc7c7\",\"media_references\":[{\"url\":\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\",\"sha256\":\"0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8\",\"size\":10,\"media_type\":\"image/jpeg\"}],\"artifact_digest\":\"0ec5162ab80988999aac62329d4cfc9c7efce6a82bbda539a723347d73596eb3\"}"
+      }
+    },
+    {
+      "id": "event_time_round_trip",
+      "kind": "publication_artifact.build_calendar_time_event.valid",
+      "input": { "fixture": "event_time" },
+      "expected": {
+        "semantic_variant": "event_time",
+        "operation_id": "social.calendar_time_event.build_authored_draft",
+        "contract_id": "radroots.calendar.time_event.v1",
+        "event_kind": 31923,
+        "media_count": 1,
+        "expected_event_id": "2088ed11cd8c1495a82e6f5198ed2ee98e0cbc599f22d7f3380892155dc55894",
+        "artifact_digest": "56bfb4bed87559a58922343905a73c0c96dd0a57f94ff0955caecf0589198638",
+        "canonical_json_bytes": 1013,
+        "canonical_json_sha256": "58e3c7e684bc774c35b08b246075076b5286d51639eb0651ed5b6362d958639e",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"event_time\",\"authored_operation_id\":\"social.calendar_time_event.build_authored_draft\",\"event_contract_id\":\"radroots.calendar.time_event.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":31923,\"tags\":[[\"d\",\"farm-tour-2026\"],[\"title\",\"Saanich Farm Tour\"],[\"start\",\"1785003600\"],[\"end\",\"1785007200\"],[\"D\",\"20659\"],[\"start_tzid\",\"America/Vancouver\"],[\"image\",\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\"]],\"content\":\"A one-hour farm tour\"},\"expected_event_id\":\"2088ed11cd8c1495a82e6f5198ed2ee98e0cbc599f22d7f3380892155dc55894\",\"media_references\":[{\"url\":\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\",\"sha256\":\"0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8\",\"size\":10,\"media_type\":\"image/jpeg\"}],\"artifact_digest\":\"56bfb4bed87559a58922343905a73c0c96dd0a57f94ff0955caecf0589198638\"}"
+      }
+    },
+    {
+      "id": "food_availability_round_trip",
+      "kind": "publication_artifact.build_food_availability.valid",
+      "input": { "fixture": "food_availability" },
+      "expected": {
+        "semantic_variant": "food_availability",
+        "operation_id": "food_availability.build_authored_draft",
+        "contract_id": "radroots.food.availability.v1",
+        "event_kind": 30402,
+        "media_count": 1,
+        "expected_event_id": "76b60f1b178c0dbdc14a87de36151ea6b04a866ce50e34a0ccae2f406f514e81",
+        "artifact_digest": "f0989cb993194af4a2f907ad8337e50378d2757c536a09afb4055a681043a7d8",
+        "canonical_json_bytes": 1132,
+        "canonical_json_sha256": "525dc96e87b79b1ef3aa67c711cccd8b8e6c205665770ebcb8283035b7b496da",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"food_availability\",\"authored_operation_id\":\"food_availability.build_authored_draft\",\"event_contract_id\":\"radroots.food.availability.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":30402,\"tags\":[[\"d\",\"nantes-carrots\"],[\"title\",\"Nantes Carrots\"],[\"summary\",\"Fresh bunches\"],[\"published_at\",\"1784347140\"],[\"location\",\"Central Saanich, BC\"],[\"price\",\"3\",\"CAD\"],[\"radroots:price_unit\",\"lb\"],[\"radroots:quantity\",\"24\",\"lb\"],[\"status\",\"active\"],[\"image\",\"https://food.example/8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e.png\",\"1200x800\"]],\"content\":\"Fresh Nantes carrots available this week.\"},\"expected_event_id\":\"76b60f1b178c0dbdc14a87de36151ea6b04a866ce50e34a0ccae2f406f514e81\",\"media_references\":[{\"url\":\"https://food.example/8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e.png\",\"sha256\":\"8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e\",\"size\":14,\"media_type\":\"image/png\"}],\"artifact_digest\":\"f0989cb993194af4a2f907ad8337e50378d2757c536a09afb4055a681043a7d8\"}"
+      }
+    },
+    {
+      "id": "canonical_json_serialization",
+      "kind": "publication_artifact.to_canonical_json.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "canonical_json_bytes": 1305,
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8"
+      }
+    },
+    {
+      "id": "canonical_json_reload",
+      "kind": "publication_artifact.from_canonical_json.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "semantic_variant": "profile",
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8"
+      }
+    },
+    {
+      "id": "leading_whitespace_is_noncanonical",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "leading_whitespace" },
+      "expected": { "error": "publication_artifact_non_canonical_json" }
+    },
+    {
+      "id": "artifact_exact_byte_limit_reaches_parser",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "artifact_exact_byte_limit" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "artifact_one_byte_over_limit_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "artifact_one_over_byte_limit" },
+      "expected": { "error": "publication_artifact_too_large" }
+    },
+    {
+      "id": "unknown_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "unknown_draft_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_draft_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "nested_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "nested_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "missing_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "missing_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "malformed_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "malformed_expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_invalid" }
+    },
+    {
+      "id": "uppercase_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "uppercase_expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_invalid" }
+    },
+    {
+      "id": "duplicate_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "duplicate_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "unknown_media_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_media_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "json_field_order_is_noncanonical",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "json_field_order" },
+      "expected": { "error": "publication_artifact_non_canonical_json" }
+    },
+    {
+      "id": "unknown_version_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "schema_version" },
+      "expected": { "error": "publication_artifact_version_unsupported" }
+    },
+    {
+      "id": "cross_variant_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "all_cross_variants" },
+      "expected": { "error": "publication_authored_operation_mismatch" }
+    },
+    {
+      "id": "operation_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "operation_id" },
+      "expected": { "error": "publication_authored_operation_mismatch" }
+    },
+    {
+      "id": "contract_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "contract_id" },
+      "expected": { "error": "publication_event_contract_mismatch" }
+    },
+    {
+      "id": "kind_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "kind" },
+      "expected": { "error": "publication_kind_mismatch" }
+    },
+    {
+      "id": "author_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "author" },
+      "expected": { "error": "publication_expected_author_invalid" }
+    },
+    {
+      "id": "created_at_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "created_at" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "draft_tags_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "draft_tags" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "draft_content_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "draft_content" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "noncanonical_nip05_is_rejected_after_id_rebuild",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "noncanonical_nip05" },
+      "expected": { "error": "publication_profile_invalid" }
+    },
+    {
+      "id": "empty_ask_content_is_rejected_after_id_rebuild",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "ask", "mutation": "empty_ask_content" },
+      "expected": { "error": "publication_post_profile_invalid" }
+    },
+    {
+      "id": "expected_event_id_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "digest_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "digest" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "media_order_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_order" },
+      "expected": { "error": "publication_media_inventory_non_canonical" }
+    },
+    {
+      "id": "profile_media_commitment_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_size" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "media_url_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_url" },
+      "expected": { "error": "publication_media_inventory_mismatch" }
+    },
+    {
+      "id": "noncanonical_media_url_casing_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_url_casing" },
+      "expected": { "error": "publication_media_reference_invalid" }
+    },
+    {
+      "id": "media_hash_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_hash" },
+      "expected": { "error": "publication_media_reference_invalid" }
+    },
+    {
+      "id": "media_type_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_type" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "post_media_commitment_must_match_imeta",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "photo_update", "mutation": "media_size" },
+      "expected": { "error": "publication_media_inventory_mismatch" }
+    }
+  ]
+}
diff --git a/contracts/operations.toml b/contracts/operations.toml
@@ -15,6 +15,7 @@ domains = [
   "trade_validation",
   "social",
   "knowledge",
+  "publication",
 ]
 
 [shared_types]
@@ -98,6 +99,13 @@ public = [
   "RadrootsProfileAdmissionError",
   "RadrootsNip05IdentityVerification",
   "RadrootsUnverifiedProfileMediaReference",
+  "RadrootsPhase1PublicationEventVariant",
+  "RadrootsPhase1PublicationSemanticVariant",
+  "RadrootsPhase1PublicationDraft",
+  "RadrootsPhase1PublicationMediaReference",
+  "RadrootsPhase1PublicationArtifactDigest",
+  "RadrootsPhase1PublicationArtifact",
+  "RadrootsPhase1PublicationArtifactError",
   "RadrootsFarm",
   "RadrootsOperationalListing",
   "RadrootsPost",
@@ -254,6 +262,7 @@ public = [
 
 [errors]
 classes = [
+  "none",
   "encode_error",
   "parse_error",
   "validation_error",
@@ -654,6 +663,249 @@ case_kinds = [
   "food_availability.validate_revision.invalid",
 ]
 
+[operations.phase1_publication_artifact_build_profile]
+domain = "publication"
+id = "publication_artifact.build_profile"
+stability = "beta"
+inputs = ["RadrootsAuthoredProfile", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_profile.implementation]
+rust_modules = [
+  "crates/event/src/profile.rs",
+  "crates/event_codec/src/profile/authored.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_profile.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_profile.valid"]
+
+[operations.phase1_publication_artifact_build_update]
+domain = "publication"
+id = "publication_artifact.build_update"
+stability = "beta"
+inputs = ["RadrootsAuthoredUpdate", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_update.implementation]
+rust_modules = [
+  "crates/event/src/post.rs",
+  "crates/event_codec/src/post/authored.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_update.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_update.valid"]
+
+[operations.phase1_publication_artifact_build_photo_update]
+domain = "publication"
+id = "publication_artifact.build_photo_update"
+stability = "beta"
+inputs = ["RadrootsAuthoredPhotoUpdate", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_photo_update.implementation]
+rust_modules = [
+  "crates/event/src/post.rs",
+  "crates/event_codec/src/post/authored.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_photo_update.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_photo_update.valid"]
+
+[operations.phase1_publication_artifact_build_ask]
+domain = "publication"
+id = "publication_artifact.build_ask"
+stability = "beta"
+inputs = ["RadrootsAuthoredAsk", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_ask.implementation]
+rust_modules = [
+  "crates/event/src/post.rs",
+  "crates/event_codec/src/post/authored.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_ask.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_ask.valid"]
+
+[operations.phase1_publication_artifact_build_calendar_date_event]
+domain = "publication"
+id = "publication_artifact.build_calendar_date_event"
+stability = "beta"
+inputs = ["RadrootsAuthoredCalendarDateEvent", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_calendar_date_event.implementation]
+rust_modules = [
+  "crates/event/src/calendar.rs",
+  "crates/event_codec/src/calendar/encode.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_calendar_date_event.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_calendar_date_event.valid"]
+
+[operations.phase1_publication_artifact_build_calendar_time_event]
+domain = "publication"
+id = "publication_artifact.build_calendar_time_event"
+stability = "beta"
+inputs = ["RadrootsAuthoredCalendarTimeEvent", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_calendar_time_event.implementation]
+rust_modules = [
+  "crates/event/src/calendar.rs",
+  "crates/event_codec/src/calendar/encode.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_calendar_time_event.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_calendar_time_event.valid"]
+
+[operations.phase1_publication_artifact_build_food_availability]
+domain = "publication"
+id = "publication_artifact.build_food_availability"
+stability = "beta"
+inputs = ["RadrootsFoodAvailabilityDetails", "u64", "String"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "validation_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_build_food_availability.implementation]
+rust_modules = [
+  "crates/event/src/food_availability.rs",
+  "crates/event_codec/src/food_availability/authored.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationSemanticVariant",
+]
+
+[operations.phase1_publication_artifact_build_food_availability.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.build_food_availability.valid"]
+
+[operations.phase1_publication_artifact_to_canonical_json]
+domain = "publication"
+id = "publication_artifact.to_canonical_json"
+stability = "beta"
+inputs = ["RadrootsPhase1PublicationArtifact"]
+outputs = ["Bytes"]
+error_class = "none"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_to_canonical_json.implementation]
+rust_modules = ["crates/event_codec/src/wire/publication.rs"]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+]
+
+[operations.phase1_publication_artifact_to_canonical_json.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = ["publication_artifact.to_canonical_json.valid"]
+
+[operations.phase1_publication_artifact_from_canonical_json]
+domain = "publication"
+id = "publication_artifact.from_canonical_json"
+stability = "beta"
+inputs = ["Bytes"]
+outputs = ["RadrootsPhase1PublicationArtifact"]
+error_class = "parse_error"
+deterministic = true
+signing = "none"
+transport = "none"
+
+[operations.phase1_publication_artifact_from_canonical_json.implementation]
+rust_modules = [
+  "crates/event_codec/src/calendar/decode.rs",
+  "crates/event_codec/src/food_availability/inbound.rs",
+  "crates/event_codec/src/food_availability/inbound/registry_v7.rs",
+  "crates/event_codec/src/post/authored.rs",
+  "crates/event_codec/src/post/inbound.rs",
+  "crates/event_codec/src/post/inbound/registry_v7.rs",
+  "crates/event_codec/src/wire/publication.rs",
+]
+rust_types = [
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifact",
+  "radroots_event_codec::wire::publication::RadrootsPhase1PublicationArtifactError",
+]
+
+[operations.phase1_publication_artifact_from_canonical_json.conformance]
+vector = "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+case_kinds = [
+  "publication_artifact.from_canonical_json.valid",
+  "publication_artifact.from_canonical_json.invalid",
+]
+
 [operations.profile_build_authored_draft]
 domain = "profile"
 id = "profile.build_authored_draft"
diff --git a/contracts/releases/1.0.0-alpha.1.toml b/contracts/releases/1.0.0-alpha.1.toml
@@ -277,6 +277,17 @@ semver_impacts = [
 summary = "Add one signature-verified event admission operation that preserves typed product admissions, applies complete registry validation to generic contracts, and distinguishes unsupported matching, invalid shapes, Post-to-Reply routing, and kind-30402 profile exclusions."
 
 [[changes]]
+id = "phase1-publication-artifact"
+classification = "feature"
+semver_impacts = [
+  "add_exported_type",
+  "add_exported_function",
+  "add_exported_constant",
+  "add_conformance_vector",
+]
+summary = "Add the authored-only Phase 1 publication artifact with seven typed leaves, exact top-level NIP-01 id placement, explicit canonical-byte encode/decode operations, bounded signed-event and artifact wires, complete Blossom URL commitments, and a single-NUL domain-separated digest."
+
+[[changes]]
 id = "event-store-validity-visibility-split"
 classification = "breaking"
 semver_impacts = [
diff --git a/crates/event_codec/Cargo.toml b/crates/event_codec/Cargo.toml
@@ -16,7 +16,7 @@ readme = "README"
 default = ["std"]
 std = ["radroots_blossom/std", "radroots_core/std", "radroots_event/std"]
 serde = ["dep:serde", "radroots_core/serde", "radroots_event/serde"]
-serde_json = ["serde", "dep:serde_json"]
+serde_json = ["serde", "dep:hex", "dep:serde_json", "dep:sha2"]
 nostr = ["dep:nostr", "std"]
 knowledge = ["serde_json", "radroots_event/knowledge"]
 knowledge-nip54 = ["knowledge", "radroots_event/knowledge-nip54"]
diff --git a/crates/event_codec/README b/crates/event_codec/README
@@ -1,5 +1,28 @@
 # radroots_event_codec
 
+The optional `serde_json` feature includes the sealed Phase 1 publication
+artifact. It accepts only the strict authored Profile, Update, PhotoUpdate,
+Ask, date/time Event, and FoodAvailability models. The seven serialized leaves
+are `profile`, `update`, `photo_update`, `ask`, `event_date`, `event_time`, and
+`food_availability`; Event remains one semantic role with typed date and time
+subvariants.
+
+Persistence crosses only the explicit `to_canonical_json` and
+`from_canonical_json` operations. Schema version 1 orders the envelope as
+`schema_version`, `semantic_variant`, `authored_operation_id`,
+`event_contract_id`, `expected_author`, `draft`, `expected_event_id`,
+`media_references`, and `artifact_digest`. Compact JSON is capped at 2,097,152
+bytes, the eventual signed-event wire at 262,144 bytes, and media commitments
+at 4,096 complete canonical URLs. Primary byte-verified BUD-02 descriptor URLs
+retain their required hash-path extension; post fallbacks may be extensionless.
+
+The artifact digest is SHA-256 over the ASCII domain
+`radroots.phase1.publication-artifact.v1`, one literal NUL byte, and the exact
+canonical envelope through `media_references`. Reloading rejects alternate
+encodings, noncanonical identifiers or URL casing, profile drift, and digest
+tampering, but does not restore byte verification, upload, signing, or
+authenticity capabilities.
+
 This is the README for `radroots_event_codec`, which provides canonical event
 codecs and tag builders for the `radroots` core libraries.
 
diff --git a/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.json b/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.json
@@ -0,0 +1,2387 @@
+{
+  "schema_version": 1,
+  "contract_id": "radroots_event_codec.phase1_publication_artifact_v1",
+  "authority_id": "phase1_publication_artifact_v1",
+  "manifest_schema": {
+    "path": "crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json",
+    "byte_length": 11972,
+    "sha256": "1d72cee2754e7ac45105d79b1ecf7d44251991be7a18ba106166e962000e8320",
+    "hash_algorithm": "sha256_bytes_v1"
+  },
+  "predecessor": {
+    "contract_id": "radroots_event_store.raw_source_rebuild_v1",
+    "manifest": {
+      "path": "crates/event_store/contracts/raw_source_rebuild_v1.manifest.json",
+      "byte_length": 45449,
+      "sha256": "03253ce31dc31d465880a895d2685f5deb1274948e0a4eabe81a2f08f238c483",
+      "hash_algorithm": "sha256_bytes_v1"
+    }
+  },
+  "event_contract_registry": {
+    "version": 7,
+    "inventory": {
+      "path": "contracts/event_store/event_contract_registry_v7.inventory.json",
+      "byte_length": 158021,
+      "sha256": "91595544310f865bdef064ee760c227c870417a95b87b3e27278f8da74fdddea",
+      "hash_algorithm": "sha256_bytes_v1"
+    },
+    "sidecar": {
+      "path": "contracts/event_store/event_contract_registry_v7.inventory.sha256",
+      "byte_length": 65,
+      "sha256": "823081e6f423c149865521b185a8517aea35ce4470fa77c165ad7ca5207f036b",
+      "hash_algorithm": "sha256_bytes_v1"
+    },
+    "evolution": "immutable_registry_v7_plus_additive_publication_authority_v1"
+  },
+  "artifact": {
+    "schema_version": 1,
+    "validator": "validate_phase1_publication_artifact",
+    "semantic_roles": [
+      "profile",
+      "update",
+      "photo_update",
+      "ask",
+      "event",
+      "food_availability"
+    ],
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+    "record_path": "contracts/releases/1.0.0-alpha.1.toml",
+    "change_id": "phase1-publication-artifact",
+    "changelog_path": "CHANGELOG.md",
+    "changelog_marker": "<!-- release-change: phase1-publication-artifact -->"
+  }
+}
diff --git a/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json b/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json
@@ -0,0 +1,493 @@
+{
+  "$defs": {
+    "constructor": {
+      "additionalProperties": false,
+      "properties": {
+        "authored_operation_id": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "constructor": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "event_contract_id": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "event_variant": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "kind": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "publication_operation_id": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "semantic_variant": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "serialized_semantic_variant": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "strict_input": {
+          "minLength": 1,
+          "type": "string"
+        }
+      },
+      "required": [
+        "semantic_variant",
+        "serialized_semantic_variant",
+        "event_variant",
+        "strict_input",
+        "constructor",
+        "publication_operation_id",
+        "authored_operation_id",
+        "event_contract_id",
+        "kind"
+      ],
+      "type": "object"
+    },
+    "file": {
+      "additionalProperties": false,
+      "properties": {
+        "byte_length": {
+          "minimum": 1,
+          "type": "integer"
+        },
+        "hash_algorithm": {
+          "const": "sha256_bytes_v1"
+        },
+        "path": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "sha256": {
+          "pattern": "^[0-9a-f]{64}$",
+          "type": "string"
+        }
+      },
+      "required": [
+        "path",
+        "byte_length",
+        "sha256",
+        "hash_algorithm"
+      ],
+      "type": "object"
+    },
+    "operation": {
+      "additionalProperties": false,
+      "properties": {
+        "error_class": {
+          "enum": [
+            "none",
+            "validation_error",
+            "parse_error"
+          ]
+        },
+        "id": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "output": {
+          "enum": [
+            "RadrootsPhase1PublicationArtifact",
+            "Bytes"
+          ]
+        },
+        "signing": {
+          "const": "none"
+        },
+        "strict_input": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "transport": {
+          "const": "none"
+        }
+      },
+      "required": [
+        "id",
+        "strict_input",
+        "output",
+        "error_class",
+        "signing",
+        "transport"
+      ],
+      "type": "object"
+    },
+    "source": {
+      "additionalProperties": false,
+      "properties": {
+        "byte_length": {
+          "minimum": 1,
+          "type": "integer"
+        },
+        "hash_algorithm": {
+          "const": "sha256_bytes_v1"
+        },
+        "path": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "role": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "sha256": {
+          "pattern": "^[0-9a-f]{64}$",
+          "type": "string"
+        }
+      },
+      "required": [
+        "role",
+        "path",
+        "byte_length",
+        "sha256",
+        "hash_algorithm"
+      ],
+      "type": "object"
+    }
+  },
+  "$id": "https://radroots.org/contracts/event-codec/phase1-publication-artifact-v1.schema.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": false,
+  "properties": {
+    "artifact": {
+      "additionalProperties": false,
+      "properties": {
+        "artifact_max_bytes": {
+          "const": 2097152
+        },
+        "canonical_encoding": {
+          "const": "serde_json_compact_struct_field_order_v1"
+        },
+        "constructors": {
+          "items": {
+            "$ref": "#/$defs/constructor"
+          },
+          "maxItems": 7,
+          "minItems": 7,
+          "type": "array"
+        },
+        "denied_inputs": {
+          "const": [
+            "arbitrary_event_draft",
+            "raw_json",
+            "numeric_kind",
+            "signed_event",
+            "private_key",
+            "signer"
+          ]
+        },
+        "digest_algorithm": {
+          "const": "sha256_domain_nul_canonical_json_v1"
+        },
+        "digest_domain": {
+          "const": "radroots.phase1.publication-artifact.v1"
+        },
+        "digest_domain_terminator": {
+          "const": "0x00"
+        },
+        "digest_preimage": {
+          "const": "ascii_domain_then_single_nul_then_canonical_envelope_without_digest_v1"
+        },
+        "draft_fields": {
+          "const": [
+            "created_at",
+            "kind",
+            "tags",
+            "content"
+          ]
+        },
+        "envelope_fields": {
+          "const": [
+            "schema_version",
+            "semantic_variant",
+            "authored_operation_id",
+            "event_contract_id",
+            "expected_author",
+            "draft",
+            "expected_event_id",
+            "media_references",
+            "artifact_digest"
+          ]
+        },
+        "event_subvariants": {
+          "const": [
+            "date",
+            "time"
+          ]
+        },
+        "media_reference_fields": {
+          "const": [
+            "url",
+            "sha256",
+            "size",
+            "media_type"
+          ]
+        },
+        "media_reference_identity": {
+          "const": "exact_case_preserving_approved_url_with_descriptor_commitment_v1"
+        },
+        "media_reference_max_count": {
+          "const": 4096
+        },
+        "post_fallback_url_requirement": {
+          "const": "approved_blossom_url_extension_optional_v1"
+        },
+        "primary_media_url_requirement": {
+          "const": "blossom_hash_path_extension_required_v1"
+        },
+        "reload_capability": {
+          "const": "persisted_artifact_only_no_prior_capability_restoration_v1"
+        },
+        "schema_version": {
+          "const": 1
+        },
+        "semantic_roles": {
+          "const": [
+            "profile",
+            "update",
+            "photo_update",
+            "ask",
+            "event",
+            "food_availability"
+          ]
+        },
+        "serialized_semantic_variants": {
+          "const": [
+            "profile",
+            "update",
+            "photo_update",
+            "ask",
+            "event_date",
+            "event_time",
+            "food_availability"
+          ]
+        },
+        "signed_event_wire_max_bytes": {
+          "const": 262144
+        },
+        "threat_boundary": {
+          "const": [
+            "detects_accidental_corruption",
+            "detects_payload_only_modification",
+            "detects_digest_only_modification",
+            "does_not_authenticate_actor_rewriting_payload_and_digest",
+            "does_not_survive_validator_binary_or_host_compromise",
+            "does_not_restore_byte_verification_or_upload_completion",
+            "does_not_replace_nip01_id_and_signature_verification"
+          ]
+        },
+        "validator": {
+          "const": "validate_phase1_publication_artifact"
+        }
+      },
+      "required": [
+        "schema_version",
+        "validator",
+        "semantic_roles",
+        "serialized_semantic_variants",
+        "event_subvariants",
+        "canonical_encoding",
+        "artifact_max_bytes",
+        "signed_event_wire_max_bytes",
+        "media_reference_max_count",
+        "envelope_fields",
+        "draft_fields",
+        "media_reference_fields",
+        "media_reference_identity",
+        "primary_media_url_requirement",
+        "post_fallback_url_requirement",
+        "digest_algorithm",
+        "digest_domain",
+        "digest_domain_terminator",
+        "digest_preimage",
+        "constructors",
+        "denied_inputs",
+        "reload_capability",
+        "threat_boundary"
+      ],
+      "type": "object"
+    },
+    "authority_id": {
+      "const": "phase1_publication_artifact_v1"
+    },
+    "contract_id": {
+      "const": "radroots_event_codec.phase1_publication_artifact_v1"
+    },
+    "event_contract_registry": {
+      "additionalProperties": false,
+      "properties": {
+        "evolution": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "inventory": {
+          "$ref": "#/$defs/file"
+        },
+        "sidecar": {
+          "$ref": "#/$defs/file"
+        },
+        "version": {
+          "const": 7
+        }
+      },
+      "required": [
+        "version",
+        "inventory",
+        "sidecar",
+        "evolution"
+      ],
+      "type": "object"
+    },
+    "manifest_schema": {
+      "$ref": "#/$defs/file"
+    },
+    "operations": {
+      "items": {
+        "$ref": "#/$defs/operation"
+      },
+      "maxItems": 9,
+      "minItems": 9,
+      "type": "array"
+    },
+    "predecessor": {
+      "additionalProperties": false,
+      "properties": {
+        "contract_id": {
+          "const": "radroots_event_store.raw_source_rebuild_v1"
+        },
+        "manifest": {
+          "$ref": "#/$defs/file"
+        }
+      },
+      "required": [
+        "contract_id",
+        "manifest"
+      ],
+      "type": "object"
+    },
+    "predecessor_source_supersessions": {
+      "items": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "maxItems": 6,
+      "minItems": 6,
+      "type": "array"
+    },
+    "release": {
+      "additionalProperties": false,
+      "properties": {
+        "change_id": {
+          "const": "phase1-publication-artifact"
+        },
+        "changelog_marker": {
+          "const": "<!-- release-change: phase1-publication-artifact -->"
+        },
+        "changelog_path": {
+          "const": "CHANGELOG.md"
+        },
+        "record_path": {
+          "const": "contracts/releases/1.0.0-alpha.1.toml"
+        }
+      },
+      "required": [
+        "record_path",
+        "change_id",
+        "changelog_path",
+        "changelog_marker"
+      ],
+      "type": "object"
+    },
+    "result_vector": {
+      "additionalProperties": false,
+      "properties": {
+        "byte_length": {
+          "minimum": 1,
+          "type": "integer"
+        },
+        "canonical_path": {
+          "const": "contracts/conformance/vectors/publication/phase1_artifact.v1.json"
+        },
+        "executor_path": {
+          "const": "crates/event_codec/tests/publication_artifact.rs"
+        },
+        "executor_test": {
+          "const": "publication_artifact_conformance_vector_executes_every_case"
+        },
+        "hash_algorithm": {
+          "const": "sha256_bytes_v1"
+        },
+        "invalid_case_ids": {
+          "items": {
+            "type": "string"
+          },
+          "minItems": 24,
+          "type": "array"
+        },
+        "mirror_path": {
+          "const": "crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json"
+        },
+        "sha256": {
+          "pattern": "^[0-9a-f]{64}$",
+          "type": "string"
+        },
+        "valid_case_ids": {
+          "items": {
+            "type": "string"
+          },
+          "minItems": 7,
+          "type": "array"
+        }
+      },
+      "required": [
+        "canonical_path",
+        "mirror_path",
+        "byte_length",
+        "sha256",
+        "hash_algorithm",
+        "executor_path",
+        "executor_test",
+        "valid_case_ids",
+        "invalid_case_ids"
+      ],
+      "type": "object"
+    },
+    "schema_version": {
+      "const": 1
+    },
+    "source_files": {
+      "items": {
+        "$ref": "#/$defs/source"
+      },
+      "minItems": 1,
+      "type": "array"
+    }
+  },
+  "required": [
+    "schema_version",
+    "contract_id",
+    "authority_id",
+    "manifest_schema",
+    "predecessor",
+    "event_contract_registry",
+    "artifact",
+    "operations",
+    "predecessor_source_supersessions",
+    "source_files",
+    "result_vector",
+    "release"
+  ],
+  "title": "Radroots Phase 1 Publication Artifact Contract",
+  "type": "object"
+}
diff --git a/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.sha256 b/crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.sha256
@@ -0,0 +1 @@
+a07aace74f4747ba6e769a99acad7eadaac2d19d26aa0dd1c280ab92454519b5
diff --git a/crates/event_codec/src/lib.rs b/crates/event_codec/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
 #![cfg_attr(coverage_nightly, feature(coverage_attribute))]
 #![forbid(unsafe_code)]
 #[cfg(not(feature = "std"))]
diff --git a/crates/event_codec/src/wire.rs b/crates/event_codec/src/wire.rs
@@ -4,6 +4,9 @@ use alloc::{
     vec::Vec,
 };
 
+#[cfg(feature = "serde_json")]
+pub mod publication;
+
 pub fn canonicalize_tags(tags: &mut Vec<Vec<String>>) {
     tags.retain(|t| t.first().map(|s| !s.trim().is_empty()).unwrap_or(false));
     for t in tags.iter_mut() {
diff --git a/crates/event_codec/src/wire/publication.rs b/crates/event_codec/src/wire/publication.rs
@@ -0,0 +1,1596 @@
+//! Sealed persistence boundary for the Radroots Phase 1 publication set.
+//!
+//! Artifacts can only be created from strict authored models or reloaded from
+//! their exact canonical JSON bytes. Reloading restores a persisted artifact;
+//! it does not restore byte-verification, upload, signing, or authenticity
+//! capabilities.
+//!
+//! The digest detects accidental corruption, payload-only modification, and
+//! digest-only modification. It does not authenticate against an actor able to
+//! rewrite both the payload and digest, replace this validator, compromise the
+//! signer, or control the host/database. NIP-01 id and signature verification
+//! remain the cryptographic authenticity boundary.
+
+#[cfg(not(feature = "std"))]
+use alloc::{
+    format,
+    string::{String, ToString},
+    vec,
+    vec::Vec,
+};
+use core::fmt;
+
+use radroots_blossom::{
+    RadrootsBlossomApprovedBlobUrl, RadrootsBlossomByteVerifiedDescriptor,
+    RadrootsBlossomMediaType, RadrootsBlossomSha256, url::RadrootsBlossomBlobUrl,
+};
+use radroots_event::{
+    RadrootsEventTags,
+    calendar::{
+        RadrootsAdmittedCalendarDateEvent, RadrootsAdmittedCalendarTimeEvent,
+        RadrootsAuthoredCalendarDateEvent, RadrootsAuthoredCalendarTimeEvent,
+        RadrootsParsedNip52CalendarCommon,
+    },
+    food_availability::{RADROOTS_FOOD_AVAILABILITY_CONTRACT_ID, RadrootsFoodAvailabilityDetails},
+    ids::{RadrootsEventId, RadrootsPublicKey},
+    kinds::{
+        KIND_CALENDAR_DATE_EVENT, KIND_CALENDAR_TIME_EVENT, KIND_CLASSIFIED_LISTING, KIND_POST,
+        KIND_PROFILE,
+    },
+    post::{RadrootsAuthoredAsk, RadrootsAuthoredPhotoUpdate, RadrootsAuthoredUpdate},
+    profile::{
+        RADROOTS_PROFILE_METADATA_MAX_CONTENT_BYTES, RadrootsAuthoredProfile,
+        RadrootsNip05Identifier,
+    },
+    wire::{
+        DEFAULT_CONTENT_MAX_BYTES, DEFAULT_RAW_JSON_MAX_BYTES, RadrootsNip01EventWireParts,
+        compute_canonical_nip01_event_id,
+    },
+};
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+
+use crate::{
+    calendar::{decode, encode},
+    food_availability::{authored as food_authored, inbound as food_inbound},
+    post::{authored as post_authored, inbound as post_inbound},
+    profile::authored as profile_authored,
+};
+
+pub const RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION: u32 = 1;
+pub const RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES: usize = 2 * 1024 * 1024;
+pub const RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT: usize = 4096;
+pub const RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES: usize = DEFAULT_RAW_JSON_MAX_BYTES;
+
+const ARTIFACT_DIGEST_DOMAIN: &[u8] = b"radroots.phase1.publication-artifact.v1";
+const ARTIFACT_DIGEST_DOMAIN_TERMINATOR: &[u8] = b"\0";
+const PROFILE_OPERATION_ID: &str = "profile.build_authored_draft";
+const PROFILE_CONTRACT_ID: &str = "radroots.profile.metadata.v1";
+const UPDATE_OPERATION_ID: &str = "social.update.build_authored_draft";
+const UPDATE_CONTRACT_ID: &str = "radroots.social.update.v1";
+const PHOTO_UPDATE_OPERATION_ID: &str = "social.photo_update.build_authored_draft";
+const PHOTO_UPDATE_CONTRACT_ID: &str = "radroots.social.photo_update.v1";
+const ASK_OPERATION_ID: &str = "social.ask.build_authored_draft";
+const ASK_CONTRACT_ID: &str = "radroots.social.ask.v1";
+const CALENDAR_DATE_OPERATION_ID: &str = "social.calendar_date_event.build_authored_draft";
+const CALENDAR_DATE_CONTRACT_ID: &str = "radroots.calendar.date_event.v1";
+const CALENDAR_TIME_OPERATION_ID: &str = "social.calendar_time_event.build_authored_draft";
+const CALENDAR_TIME_CONTRACT_ID: &str = "radroots.calendar.time_event.v1";
+const FOOD_OPERATION_ID: &str = "food_availability.build_authored_draft";
+
+/// The two strict NIP-52 event forms admitted by the Phase 1 Event root.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum RadrootsPhase1PublicationEventVariant {
+    Date,
+    Time,
+}
+
+/// Closed semantic set represented by a Phase 1 publication artifact.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum RadrootsPhase1PublicationSemanticVariant {
+    Profile,
+    Update,
+    PhotoUpdate,
+    Ask,
+    Event(RadrootsPhase1PublicationEventVariant),
+    FoodAvailability,
+}
+
+impl RadrootsPhase1PublicationSemanticVariant {
+    pub const fn as_str(self) -> &'static str {
+        match self {
+            Self::Profile => "profile",
+            Self::Update => "update",
+            Self::PhotoUpdate => "photo_update",
+            Self::Ask => "ask",
+            Self::Event(RadrootsPhase1PublicationEventVariant::Date) => "event_date",
+            Self::Event(RadrootsPhase1PublicationEventVariant::Time) => "event_time",
+            Self::FoodAvailability => "food_availability",
+        }
+    }
+
+    fn parse(value: &str) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        match value {
+            "profile" => Ok(Self::Profile),
+            "update" => Ok(Self::Update),
+            "photo_update" => Ok(Self::PhotoUpdate),
+            "ask" => Ok(Self::Ask),
+            "event_date" => Ok(Self::Event(RadrootsPhase1PublicationEventVariant::Date)),
+            "event_time" => Ok(Self::Event(RadrootsPhase1PublicationEventVariant::Time)),
+            "food_availability" => Ok(Self::FoodAvailability),
+            _ => Err(RadrootsPhase1PublicationArtifactError::UnknownSemanticVariant),
+        }
+    }
+
+    pub const fn authored_operation_id(self) -> &'static str {
+        profile_for_variant(self).operation_id
+    }
+
+    pub const fn event_contract_id(self) -> &'static str {
+        profile_for_variant(self).contract_id
+    }
+
+    pub const fn kind(self) -> u32 {
+        profile_for_variant(self).kind
+    }
+}
+
+#[derive(Clone, Copy)]
+struct PublicationProfile {
+    operation_id: &'static str,
+    contract_id: &'static str,
+    kind: u32,
+}
+
+const fn profile_for_variant(
+    variant: RadrootsPhase1PublicationSemanticVariant,
+) -> PublicationProfile {
+    match variant {
+        RadrootsPhase1PublicationSemanticVariant::Profile => PublicationProfile {
+            operation_id: PROFILE_OPERATION_ID,
+            contract_id: PROFILE_CONTRACT_ID,
+            kind: KIND_PROFILE,
+        },
+        RadrootsPhase1PublicationSemanticVariant::Update => PublicationProfile {
+            operation_id: UPDATE_OPERATION_ID,
+            contract_id: UPDATE_CONTRACT_ID,
+            kind: KIND_POST,
+        },
+        RadrootsPhase1PublicationSemanticVariant::PhotoUpdate => PublicationProfile {
+            operation_id: PHOTO_UPDATE_OPERATION_ID,
+            contract_id: PHOTO_UPDATE_CONTRACT_ID,
+            kind: KIND_POST,
+        },
+        RadrootsPhase1PublicationSemanticVariant::Ask => PublicationProfile {
+            operation_id: ASK_OPERATION_ID,
+            contract_id: ASK_CONTRACT_ID,
+            kind: KIND_POST,
+        },
+        RadrootsPhase1PublicationSemanticVariant::Event(
+            RadrootsPhase1PublicationEventVariant::Date,
+        ) => PublicationProfile {
+            operation_id: CALENDAR_DATE_OPERATION_ID,
+            contract_id: CALENDAR_DATE_CONTRACT_ID,
+            kind: KIND_CALENDAR_DATE_EVENT,
+        },
+        RadrootsPhase1PublicationSemanticVariant::Event(
+            RadrootsPhase1PublicationEventVariant::Time,
+        ) => PublicationProfile {
+            operation_id: CALENDAR_TIME_OPERATION_ID,
+            contract_id: CALENDAR_TIME_CONTRACT_ID,
+            kind: KIND_CALENDAR_TIME_EVENT,
+        },
+        RadrootsPhase1PublicationSemanticVariant::FoodAvailability => PublicationProfile {
+            operation_id: FOOD_OPERATION_ID,
+            contract_id: RADROOTS_FOOD_AVAILABILITY_CONTRACT_ID,
+            kind: KIND_CLASSIFIED_LISTING,
+        },
+    }
+}
+
+/// Exact unsigned NIP-01 state frozen into a publication artifact.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct RadrootsPhase1PublicationDraft {
+    created_at: u64,
+    kind: u32,
+    tags: Vec<Vec<String>>,
+    content: String,
+}
+
+impl RadrootsPhase1PublicationDraft {
+    pub const fn created_at(&self) -> u64 {
+        self.created_at
+    }
+
+    pub const fn kind(&self) -> u32 {
+        self.kind
+    }
+
+    pub fn tags(&self) -> &[Vec<String>] {
+        &self.tags
+    }
+
+    pub fn content(&self) -> &str {
+        &self.content
+    }
+}
+
+/// Persisted media commitment associated with one complete canonical URL.
+///
+/// This type preserves descriptor facts that entered through a byte-verified
+/// authored model. Reloading it does not re-establish byte verification or
+/// prove that the URL was uploaded or remains retrievable.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct RadrootsPhase1PublicationMediaReference {
+    url: RadrootsBlossomApprovedBlobUrl,
+    sha256: RadrootsBlossomSha256,
+    size: u64,
+    media_type: RadrootsBlossomMediaType,
+}
+
+impl RadrootsPhase1PublicationMediaReference {
+    pub fn url(&self) -> &RadrootsBlossomApprovedBlobUrl {
+        &self.url
+    }
+
+    pub const fn sha256(&self) -> RadrootsBlossomSha256 {
+        self.sha256
+    }
+
+    pub const fn size(&self) -> u64 {
+        self.size
+    }
+
+    pub fn media_type(&self) -> &RadrootsBlossomMediaType {
+        &self.media_type
+    }
+
+    fn from_verified(
+        descriptor: &RadrootsBlossomByteVerifiedDescriptor,
+        url: RadrootsBlossomApprovedBlobUrl,
+    ) -> Self {
+        Self {
+            url,
+            sha256: descriptor.sha256(),
+            size: descriptor.size(),
+            media_type: descriptor.media_type().clone(),
+        }
+    }
+
+    fn from_wire(wire: MediaReferenceWire) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let parsed_url = RadrootsBlossomBlobUrl::parse(&wire.url)
+            .and_then(RadrootsBlossomBlobUrl::approve)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidMediaReference)?;
+        if parsed_url.as_str() != wire.url {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidMediaReference);
+        }
+        let sha256 = RadrootsBlossomSha256::from_hex(&wire.sha256)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidMediaReference)?;
+        if parsed_url.as_blob_url().hash_path().hash() != sha256 {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidMediaReference);
+        }
+        let media_type = RadrootsBlossomMediaType::parse(&wire.media_type)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidMediaReference)?;
+        if media_type.as_str() != wire.media_type || !wire.media_type.starts_with("image/") {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidMediaReference);
+        }
+        Ok(Self {
+            url: parsed_url,
+            sha256,
+            size: wire.size,
+            media_type,
+        })
+    }
+
+    fn to_wire(&self) -> MediaReferenceWire {
+        MediaReferenceWire {
+            url: self.url.as_str().to_string(),
+            sha256: self.sha256.to_hex(),
+            size: self.size,
+            media_type: self.media_type.as_str().to_string(),
+        }
+    }
+}
+
+/// Domain-separated SHA-256 identity for the canonical artifact payload.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct RadrootsPhase1PublicationArtifactDigest([u8; 32]);
+
+impl RadrootsPhase1PublicationArtifactDigest {
+    pub const fn as_bytes(&self) -> &[u8; 32] {
+        &self.0
+    }
+
+    pub fn to_hex(self) -> String {
+        hex::encode(self.0)
+    }
+
+    fn parse(value: &str) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        if value.len() != 64
+            || !value
+                .bytes()
+                .all(|byte| byte.is_ascii_hexdigit() && !byte.is_ascii_uppercase())
+        {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidDigest);
+        }
+        let bytes = hex::decode(value)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidDigest)?;
+        let value: [u8; 32] = bytes
+            .try_into()
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidDigest)?;
+        Ok(Self(value))
+    }
+}
+
+impl fmt::Display for RadrootsPhase1PublicationArtifactDigest {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter.write_str(&self.to_hex())
+    }
+}
+
+/// A versioned artifact whose exact canonical bytes are ready for persistence.
+///
+/// There is deliberately no constructor from `RadrootsEventDraft`, arbitrary
+/// wire parts, raw JSON, numeric kind, or a signed event.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct RadrootsPhase1PublicationArtifact {
+    semantic_variant: RadrootsPhase1PublicationSemanticVariant,
+    expected_author: RadrootsPublicKey,
+    draft: RadrootsPhase1PublicationDraft,
+    expected_event_id: RadrootsEventId,
+    media_references: Vec<RadrootsPhase1PublicationMediaReference>,
+    artifact_digest: RadrootsPhase1PublicationArtifactDigest,
+    canonical_json: Vec<u8>,
+}
+
+impl RadrootsPhase1PublicationArtifact {
+    pub fn from_profile(
+        profile: &RadrootsAuthoredProfile,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let parts = profile_authored::authored_profile_to_wire_parts(profile)
+            .map_err(|error| encoding_error(error.code()))?;
+        let mut media = Vec::with_capacity(2);
+        for image in [profile.picture(), profile.banner()].into_iter().flatten() {
+            let descriptor = image.descriptor();
+            media.push(RadrootsPhase1PublicationMediaReference::from_verified(
+                descriptor,
+                descriptor.url().clone(),
+            ));
+        }
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::Profile,
+            created_at,
+            expected_author.as_ref(),
+            parts,
+            media,
+        )
+    }
+
+    pub fn from_update(
+        update: &RadrootsAuthoredUpdate,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::Update,
+            created_at,
+            expected_author.as_ref(),
+            post_authored::authored_update_to_wire_parts(update),
+            Vec::new(),
+        )
+    }
+
+    pub fn from_photo_update(
+        photo_update: &RadrootsAuthoredPhotoUpdate,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::PhotoUpdate,
+            created_at,
+            expected_author.as_ref(),
+            post_authored::authored_photo_update_to_wire_parts(photo_update),
+            post_media_references(photo_update.images()),
+        )
+    }
+
+    pub fn from_ask(
+        ask: &RadrootsAuthoredAsk,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::Ask,
+            created_at,
+            expected_author.as_ref(),
+            post_authored::authored_ask_to_wire_parts(ask),
+            post_media_references(ask.images()),
+        )
+    }
+
+    pub fn from_calendar_date_event(
+        event: &RadrootsAuthoredCalendarDateEvent,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let parts =
+            encode::date_to_wire_parts(event).map_err(|error| encoding_error(error.code()))?;
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::Event(
+                RadrootsPhase1PublicationEventVariant::Date,
+            ),
+            created_at,
+            expected_author.as_ref(),
+            parts,
+            authored_image_reference(event.image()),
+        )
+    }
+
+    pub fn from_calendar_time_event(
+        event: &RadrootsAuthoredCalendarTimeEvent,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let parts =
+            encode::time_to_wire_parts(event).map_err(|error| encoding_error(error.code()))?;
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::Event(
+                RadrootsPhase1PublicationEventVariant::Time,
+            ),
+            created_at,
+            expected_author.as_ref(),
+            parts,
+            authored_image_reference(event.image()),
+        )
+    }
+
+    pub fn from_food_availability(
+        details: &RadrootsFoodAvailabilityDetails,
+        created_at: u64,
+        expected_author: impl AsRef<str>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let parts = food_authored::authored_food_availability_to_wire_parts(details, created_at)
+            .map_err(|error| encoding_error(error.code()))?;
+        let media = details
+            .images()
+            .iter()
+            .map(|image| {
+                let descriptor = image.image().descriptor();
+                RadrootsPhase1PublicationMediaReference::from_verified(
+                    descriptor,
+                    descriptor.url().clone(),
+                )
+            })
+            .collect();
+        Self::from_authored_parts(
+            RadrootsPhase1PublicationSemanticVariant::FoodAvailability,
+            created_at,
+            expected_author.as_ref(),
+            parts,
+            media,
+        )
+    }
+
+    pub const fn schema_version(&self) -> u32 {
+        RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION
+    }
+
+    pub const fn semantic_variant(&self) -> RadrootsPhase1PublicationSemanticVariant {
+        self.semantic_variant
+    }
+
+    pub const fn authored_operation_id(&self) -> &'static str {
+        self.semantic_variant.authored_operation_id()
+    }
+
+    pub const fn event_contract_id(&self) -> &'static str {
+        self.semantic_variant.event_contract_id()
+    }
+
+    pub fn expected_author(&self) -> &RadrootsPublicKey {
+        &self.expected_author
+    }
+
+    pub fn draft(&self) -> &RadrootsPhase1PublicationDraft {
+        &self.draft
+    }
+
+    pub fn expected_event_id(&self) -> &RadrootsEventId {
+        &self.expected_event_id
+    }
+
+    pub fn media_references(&self) -> &[RadrootsPhase1PublicationMediaReference] {
+        &self.media_references
+    }
+
+    pub const fn artifact_digest(&self) -> RadrootsPhase1PublicationArtifactDigest {
+        self.artifact_digest
+    }
+
+    pub fn to_canonical_json(&self) -> Vec<u8> {
+        self.canonical_json.clone()
+    }
+
+    pub fn from_canonical_json(
+        bytes: &[u8],
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        if bytes.len() > RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES {
+            return Err(RadrootsPhase1PublicationArtifactError::ArtifactTooLarge {
+                max: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES,
+                actual: bytes.len(),
+            });
+        }
+        let wire: ArtifactWire = serde_json::from_slice(bytes)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidJson)?;
+        if wire.schema_version != RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION {
+            return Err(
+                RadrootsPhase1PublicationArtifactError::UnsupportedSchemaVersion {
+                    expected: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION,
+                    actual: wire.schema_version,
+                },
+            );
+        }
+        let variant = RadrootsPhase1PublicationSemanticVariant::parse(&wire.semantic_variant)?;
+        let profile = profile_for_variant(variant);
+        if wire.authored_operation_id != profile.operation_id {
+            return Err(RadrootsPhase1PublicationArtifactError::AuthoredOperationMismatch);
+        }
+        if wire.event_contract_id != profile.contract_id {
+            return Err(RadrootsPhase1PublicationArtifactError::EventContractMismatch);
+        }
+        if wire.draft.kind != profile.kind {
+            return Err(RadrootsPhase1PublicationArtifactError::KindMismatch {
+                expected: profile.kind,
+                actual: wire.draft.kind,
+            });
+        }
+        let expected_author = parse_expected_author(&wire.expected_author)?;
+        let expected_event_id = parse_expected_event_id(&wire.expected_event_id)?;
+        let draft = RadrootsPhase1PublicationDraft {
+            created_at: wire.draft.created_at,
+            kind: wire.draft.kind,
+            tags: wire.draft.tags,
+            content: wire.draft.content,
+        };
+        validate_draft_identifier(&expected_author, &draft, &expected_event_id)?;
+        validate_signed_event_wire_size(&expected_author, &draft, &expected_event_id)?;
+
+        if wire.media_references.len() > RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT {
+            return Err(
+                RadrootsPhase1PublicationArtifactError::TooManyMediaReferences {
+                    max: RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT,
+                    actual: wire.media_references.len(),
+                },
+            );
+        }
+        let original_media_wire = wire.media_references;
+        let mut media_references = original_media_wire
+            .iter()
+            .cloned()
+            .map(RadrootsPhase1PublicationMediaReference::from_wire)
+            .collect::<Result<Vec<_>, _>>()?;
+        canonicalize_media_references(&mut media_references)?;
+        if media_references
+            .iter()
+            .map(RadrootsPhase1PublicationMediaReference::to_wire)
+            .ne(original_media_wire.iter().cloned())
+        {
+            return Err(RadrootsPhase1PublicationArtifactError::NonCanonicalMediaInventory);
+        }
+        validate_phase1_publication_profile(variant, &draft, &media_references)?;
+
+        let artifact_digest =
+            RadrootsPhase1PublicationArtifactDigest::parse(&wire.artifact_digest)?;
+        let computed = compute_artifact_digest(
+            variant,
+            &expected_author,
+            &draft,
+            &expected_event_id,
+            &media_references,
+        )?;
+        if computed != artifact_digest {
+            return Err(RadrootsPhase1PublicationArtifactError::DigestMismatch);
+        }
+        let canonical_json = serialize_artifact(
+            variant,
+            &expected_author,
+            &draft,
+            &expected_event_id,
+            &media_references,
+            artifact_digest,
+        )?;
+        if canonical_json != bytes {
+            return Err(RadrootsPhase1PublicationArtifactError::NonCanonicalJson);
+        }
+        Ok(Self {
+            semantic_variant: variant,
+            expected_author,
+            draft,
+            expected_event_id,
+            media_references,
+            artifact_digest,
+            canonical_json,
+        })
+    }
+
+    fn from_authored_parts(
+        variant: RadrootsPhase1PublicationSemanticVariant,
+        created_at: u64,
+        expected_author: &str,
+        parts: RadrootsNip01EventWireParts,
+        mut media_references: Vec<RadrootsPhase1PublicationMediaReference>,
+    ) -> Result<Self, RadrootsPhase1PublicationArtifactError> {
+        let expected_author = parse_expected_author(expected_author)?;
+        let profile = profile_for_variant(variant);
+        if parts.kind != profile.kind {
+            return Err(RadrootsPhase1PublicationArtifactError::KindMismatch {
+                expected: profile.kind,
+                actual: parts.kind,
+            });
+        }
+        if media_references.len() > RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT {
+            return Err(
+                RadrootsPhase1PublicationArtifactError::TooManyMediaReferences {
+                    max: RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT,
+                    actual: media_references.len(),
+                },
+            );
+        }
+        canonicalize_media_references(&mut media_references)?;
+        let expected_event_id = compute_canonical_nip01_event_id(
+            expected_author.as_str(),
+            created_at,
+            parts.kind,
+            &parts.tags,
+            &parts.content,
+        )
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidExpectedAuthor)?;
+        let draft = RadrootsPhase1PublicationDraft {
+            created_at,
+            kind: parts.kind,
+            tags: parts.tags,
+            content: parts.content,
+        };
+        validate_signed_event_wire_size(&expected_author, &draft, &expected_event_id)?;
+        validate_phase1_publication_profile(variant, &draft, &media_references)?;
+        let artifact_digest = compute_artifact_digest(
+            variant,
+            &expected_author,
+            &draft,
+            &expected_event_id,
+            &media_references,
+        )?;
+        let canonical_json = serialize_artifact(
+            variant,
+            &expected_author,
+            &draft,
+            &expected_event_id,
+            &media_references,
+            artifact_digest,
+        )?;
+        if canonical_json.len() > RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES {
+            return Err(RadrootsPhase1PublicationArtifactError::ArtifactTooLarge {
+                max: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES,
+                actual: canonical_json.len(),
+            });
+        }
+        Ok(Self {
+            semantic_variant: variant,
+            expected_author,
+            draft,
+            expected_event_id,
+            media_references,
+            artifact_digest,
+            canonical_json,
+        })
+    }
+}
+
+/// Revalidates a sealed artifact through the same strict persisted-byte path
+/// used by later allowlist and outbox consumers.
+pub fn validate_phase1_publication_artifact(
+    artifact: &RadrootsPhase1PublicationArtifact,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let canonical_json = artifact.to_canonical_json();
+    let reloaded = RadrootsPhase1PublicationArtifact::from_canonical_json(&canonical_json)?;
+    if &reloaded != artifact {
+        return Err(RadrootsPhase1PublicationArtifactError::ArtifactStateMismatch);
+    }
+    Ok(())
+}
+
+#[non_exhaustive]
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum RadrootsPhase1PublicationArtifactError {
+    ArtifactTooLarge { max: usize, actual: usize },
+    EventWireTooLarge { max: usize, actual: usize },
+    TooManyMediaReferences { max: usize, actual: usize },
+    InvalidJson,
+    NonCanonicalJson,
+    UnsupportedSchemaVersion { expected: u32, actual: u32 },
+    UnknownSemanticVariant,
+    AuthoredOperationMismatch,
+    EventContractMismatch,
+    KindMismatch { expected: u32, actual: u32 },
+    InvalidExpectedAuthor,
+    InvalidExpectedEventId,
+    ExpectedEventIdMismatch,
+    InvalidDraft,
+    InvalidProfile,
+    InvalidPostProfile,
+    InvalidCalendarProfile,
+    InvalidFoodAvailabilityProfile,
+    InvalidMediaReference,
+    ConflictingMediaReference,
+    NonCanonicalMediaInventory,
+    MediaInventoryMismatch,
+    InvalidDigest,
+    DigestMismatch,
+    ArtifactStateMismatch,
+    AuthoredEncoding { code: &'static str },
+    Serialization,
+}
+
+impl RadrootsPhase1PublicationArtifactError {
+    pub const fn code(&self) -> &'static str {
+        match self {
+            Self::ArtifactTooLarge { .. } => "publication_artifact_too_large",
+            Self::EventWireTooLarge { .. } => "publication_event_wire_too_large",
+            Self::TooManyMediaReferences { .. } => "publication_media_count_exceeded",
+            Self::InvalidJson => "publication_artifact_invalid_json",
+            Self::NonCanonicalJson => "publication_artifact_non_canonical_json",
+            Self::UnsupportedSchemaVersion { .. } => "publication_artifact_version_unsupported",
+            Self::UnknownSemanticVariant => "publication_semantic_variant_unknown",
+            Self::AuthoredOperationMismatch => "publication_authored_operation_mismatch",
+            Self::EventContractMismatch => "publication_event_contract_mismatch",
+            Self::KindMismatch { .. } => "publication_kind_mismatch",
+            Self::InvalidExpectedAuthor => "publication_expected_author_invalid",
+            Self::InvalidExpectedEventId => "publication_expected_event_id_invalid",
+            Self::ExpectedEventIdMismatch => "publication_expected_event_id_mismatch",
+            Self::InvalidDraft => "publication_draft_invalid",
+            Self::InvalidProfile => "publication_profile_invalid",
+            Self::InvalidPostProfile => "publication_post_profile_invalid",
+            Self::InvalidCalendarProfile => "publication_calendar_profile_invalid",
+            Self::InvalidFoodAvailabilityProfile => "publication_food_profile_invalid",
+            Self::InvalidMediaReference => "publication_media_reference_invalid",
+            Self::ConflictingMediaReference => "publication_media_reference_conflict",
+            Self::NonCanonicalMediaInventory => "publication_media_inventory_non_canonical",
+            Self::MediaInventoryMismatch => "publication_media_inventory_mismatch",
+            Self::InvalidDigest => "publication_artifact_digest_invalid",
+            Self::DigestMismatch => "publication_artifact_digest_mismatch",
+            Self::ArtifactStateMismatch => "publication_artifact_state_mismatch",
+            Self::AuthoredEncoding { code } => code,
+            Self::Serialization => "publication_artifact_serialization",
+        }
+    }
+}
+
+impl fmt::Display for RadrootsPhase1PublicationArtifactError {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::ArtifactTooLarge { max, actual } => write!(
+                formatter,
+                "publication artifact is {actual} bytes; maximum is {max}"
+            ),
+            Self::EventWireTooLarge { max, actual } => write!(
+                formatter,
+                "publication event wire is {actual} bytes; maximum is {max}"
+            ),
+            Self::TooManyMediaReferences { max, actual } => write!(
+                formatter,
+                "publication artifact has {actual} media references; maximum is {max}"
+            ),
+            Self::UnsupportedSchemaVersion { expected, actual } => write!(
+                formatter,
+                "publication artifact schema version must be {expected}, got {actual}"
+            ),
+            Self::KindMismatch { expected, actual } => write!(
+                formatter,
+                "publication artifact kind must be {expected}, got {actual}"
+            ),
+            Self::AuthoredEncoding { code } => {
+                write!(
+                    formatter,
+                    "strict authored encoding failed with code {code}"
+                )
+            }
+            error => formatter.write_str(error.code()),
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for RadrootsPhase1PublicationArtifactError {}
+
+fn encoding_error(code: &'static str) -> RadrootsPhase1PublicationArtifactError {
+    RadrootsPhase1PublicationArtifactError::AuthoredEncoding { code }
+}
+
+fn parse_expected_author(
+    value: &str,
+) -> Result<RadrootsPublicKey, RadrootsPhase1PublicationArtifactError> {
+    let author = RadrootsPublicKey::parse(value)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidExpectedAuthor)?;
+    if author.as_str() != value {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidExpectedAuthor);
+    }
+    Ok(author)
+}
+
+fn parse_expected_event_id(
+    value: &str,
+) -> Result<RadrootsEventId, RadrootsPhase1PublicationArtifactError> {
+    let event_id = RadrootsEventId::parse(value)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidExpectedEventId)?;
+    if event_id.as_str() != value {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidExpectedEventId);
+    }
+    Ok(event_id)
+}
+
+fn validate_draft_identifier(
+    author: &RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &RadrootsEventId,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let computed = compute_canonical_nip01_event_id(
+        author.as_str(),
+        draft.created_at,
+        draft.kind,
+        &draft.tags,
+        &draft.content,
+    )
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidDraft)?;
+    if &computed != expected_event_id {
+        return Err(RadrootsPhase1PublicationArtifactError::ExpectedEventIdMismatch);
+    }
+    Ok(())
+}
+
+#[derive(Serialize)]
+struct SignedEventSizeWire<'a> {
+    id: &'a str,
+    pubkey: &'a str,
+    created_at: u64,
+    kind: u32,
+    tags: &'a [Vec<String>],
+    content: &'a str,
+    sig: &'a str,
+}
+
+fn validate_signed_event_wire_size(
+    author: &RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &RadrootsEventId,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let actual = signed_event_wire_size(author, draft, expected_event_id)?;
+    if actual > RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES {
+        return Err(RadrootsPhase1PublicationArtifactError::EventWireTooLarge {
+            max: RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES,
+            actual,
+        });
+    }
+    Ok(())
+}
+
+fn signed_event_wire_size(
+    author: &RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &RadrootsEventId,
+) -> Result<usize, RadrootsPhase1PublicationArtifactError> {
+    let signature = "0".repeat(128);
+    Ok(serde_json::to_vec(&SignedEventSizeWire {
+        id: expected_event_id.as_str(),
+        pubkey: author.as_str(),
+        created_at: draft.created_at,
+        kind: draft.kind,
+        tags: &draft.tags,
+        content: &draft.content,
+        sig: &signature,
+    })
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::Serialization)?
+    .len())
+}
+
+fn post_media_references(
+    images: &[radroots_event::post::RadrootsAuthoredPostImage],
+) -> Vec<RadrootsPhase1PublicationMediaReference> {
+    let mut media = Vec::new();
+    for image in images {
+        let descriptor = image.image().descriptor();
+        media.push(RadrootsPhase1PublicationMediaReference::from_verified(
+            descriptor,
+            descriptor.url().clone(),
+        ));
+        media.extend(image.fallbacks().iter().cloned().map(|fallback| {
+            RadrootsPhase1PublicationMediaReference::from_verified(descriptor, fallback)
+        }));
+    }
+    media
+}
+
+fn authored_image_reference(
+    image: Option<&radroots_event::RadrootsAuthoredImage>,
+) -> Vec<RadrootsPhase1PublicationMediaReference> {
+    image
+        .map(|image| {
+            let descriptor = image.descriptor();
+            vec![RadrootsPhase1PublicationMediaReference::from_verified(
+                descriptor,
+                descriptor.url().clone(),
+            )]
+        })
+        .unwrap_or_default()
+}
+
+fn canonicalize_media_references(
+    media: &mut Vec<RadrootsPhase1PublicationMediaReference>,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    media.sort_by(|left, right| left.url.as_str().cmp(right.url.as_str()));
+    let mut index = 1usize;
+    while index < media.len() {
+        if media[index - 1].url.as_str() == media[index].url.as_str() {
+            if media[index - 1] != media[index] {
+                return Err(RadrootsPhase1PublicationArtifactError::ConflictingMediaReference);
+            }
+            media.remove(index);
+        } else {
+            index += 1;
+        }
+    }
+    Ok(())
+}
+
+fn validate_phase1_publication_profile(
+    variant: RadrootsPhase1PublicationSemanticVariant,
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    if draft.content.len() > DEFAULT_CONTENT_MAX_BYTES
+        || RadrootsEventTags::new(draft.tags.clone()).is_err()
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidDraft);
+    }
+    match variant {
+        RadrootsPhase1PublicationSemanticVariant::Profile => validate_profile(draft, media),
+        RadrootsPhase1PublicationSemanticVariant::Update => validate_update(draft, media),
+        RadrootsPhase1PublicationSemanticVariant::PhotoUpdate => validate_post(draft, media, false),
+        RadrootsPhase1PublicationSemanticVariant::Ask => validate_post(draft, media, true),
+        RadrootsPhase1PublicationSemanticVariant::Event(
+            RadrootsPhase1PublicationEventVariant::Date,
+        ) => validate_calendar_date(draft, media),
+        RadrootsPhase1PublicationSemanticVariant::Event(
+            RadrootsPhase1PublicationEventVariant::Time,
+        ) => validate_calendar_time(draft, media),
+        RadrootsPhase1PublicationSemanticVariant::FoodAvailability => {
+            validate_food_availability(draft, media)
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct StrictProfileContent {
+    name: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    display_name: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    about: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    picture: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    banner: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    nip05: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    bot: Option<bool>,
+}
+
+fn validate_profile(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    if draft.kind != KIND_PROFILE
+        || !draft.tags.is_empty()
+        || draft.content.len() > RADROOTS_PROFILE_METADATA_MAX_CONTENT_BYTES
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidProfile);
+    }
+    let content: StrictProfileContent = serde_json::from_str(&draft.content)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidProfile)?;
+    RadrootsAuthoredProfile::new(&content.name)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidProfile)?;
+    if let Some(nip05) = content.nip05.as_deref() {
+        let parsed = RadrootsNip05Identifier::parse(nip05)
+            .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidProfile)?;
+        if parsed.as_str() != nip05 {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidProfile);
+        }
+    }
+    let canonical = serde_json::to_string(&content)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::Serialization)?;
+    if canonical != draft.content {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidProfile);
+    }
+    let urls = content
+        .picture
+        .iter()
+        .chain(content.banner.iter())
+        .map(String::as_str)
+        .collect::<Vec<_>>();
+    for url in &urls {
+        validate_primary_media_url(url, media)?;
+    }
+    validate_media_urls(urls.into_iter(), media)
+}
+
+fn validate_update(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let update = RadrootsAuthoredUpdate::new(&draft.content)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidPostProfile)?;
+    if post_authored::authored_update_to_wire_parts(&update) != draft_wire_parts(draft)
+        || !media.is_empty()
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidPostProfile);
+    }
+    Ok(())
+}
+
+fn validate_post(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+    ask: bool,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    if ask && RadrootsAuthoredAsk::new(draft.content.as_str(), Vec::new()).is_err() {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidPostProfile);
+    }
+    let projection = post_inbound::registry_v7::project_inbound_post_parts(
+        draft.kind,
+        &draft.tags,
+        &draft.content,
+    )
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidPostProfile)?;
+    let expected_classification = if ask {
+        post_inbound::RadrootsPostClassification::Ask
+    } else {
+        post_inbound::RadrootsPostClassification::PhotoUpdate
+    };
+    if projection.classification() != expected_classification
+        || !projection.diagnostics().is_empty()
+        || (!ask && projection.imeta().is_empty())
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidPostProfile);
+    }
+    let mut canonical_tags = Vec::with_capacity(projection.imeta().len() + usize::from(ask));
+    if ask {
+        canonical_tags.push(vec!["t".to_string(), "radroots-ask".to_string()]);
+    }
+    let mut urls = Vec::new();
+    for imeta in projection.imeta() {
+        let (Some(url), Some(sha256), Some(media_type), Some(dimensions), Some(size), Some(alt)) = (
+            imeta.url(),
+            imeta.sha256(),
+            imeta.media_type(),
+            imeta.dimensions(),
+            imeta.size(),
+            imeta.alt(),
+        ) else {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidPostProfile);
+        };
+        let mut tag = vec![
+            "imeta".to_string(),
+            format!("url {url}"),
+            format!("x {sha256}"),
+            format!("m {media_type}"),
+            format!("dim {}x{}", dimensions.width(), dimensions.height()),
+            format!("size {size}"),
+            format!("alt {alt}"),
+        ];
+        tag.extend(
+            imeta
+                .fallbacks()
+                .iter()
+                .map(|fallback| format!("fallback {fallback}")),
+        );
+        canonical_tags.push(tag);
+        urls.push(url);
+        urls.extend(imeta.fallbacks().iter().map(String::as_str));
+        let reference = media_reference_for_url(media, url)?;
+        validate_primary_media_reference(reference)?;
+        if reference.sha256.to_hex() != sha256
+            || reference.media_type.as_str() != media_type
+            || reference.size != size
+        {
+            return Err(RadrootsPhase1PublicationArtifactError::MediaInventoryMismatch);
+        }
+        for fallback in imeta.fallbacks() {
+            let fallback_reference = media_reference_for_url(media, fallback)?;
+            if fallback_reference.sha256 != reference.sha256
+                || fallback_reference.media_type != reference.media_type
+                || fallback_reference.size != reference.size
+            {
+                return Err(RadrootsPhase1PublicationArtifactError::MediaInventoryMismatch);
+            }
+        }
+    }
+    if canonical_tags != draft.tags {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidPostProfile);
+    }
+    validate_media_urls(urls.into_iter(), media)
+}
+
+fn validate_calendar_date(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let parsed = decode::parse_nip52_calendar_date_event(draft.kind, &draft.tags, &draft.content)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile)?;
+    let admitted = decode::admit_radroots_calendar_date_event(parsed)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile)?;
+    let canonical = canonical_date_tags(&admitted);
+    if canonical != draft.tags {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile);
+    }
+    validate_calendar_media(admitted.parsed().common(), media)
+}
+
+fn validate_calendar_time(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let parsed = decode::parse_nip52_calendar_time_event(draft.kind, &draft.tags, &draft.content)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile)?;
+    let admitted = decode::admit_radroots_calendar_time_event(parsed)
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile)?;
+    let canonical = canonical_time_tags(&admitted);
+    if canonical != draft.tags {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile);
+    }
+    validate_calendar_media(admitted.parsed().common(), media)
+}
+
+fn canonical_date_tags(event: &RadrootsAdmittedCalendarDateEvent) -> Vec<Vec<String>> {
+    let parsed = event.parsed();
+    let mut tags = vec![
+        pair("d", parsed.common().d_tag()),
+        pair("title", parsed.common().title()),
+        pair("start", parsed.start().as_str()),
+    ];
+    if let Some(end) = parsed.end() {
+        tags.push(pair("end", end.as_str()));
+    }
+    push_canonical_calendar_common_tags(&mut tags, parsed.common());
+    tags
+}
+
+fn canonical_time_tags(event: &RadrootsAdmittedCalendarTimeEvent) -> Vec<Vec<String>> {
+    let parsed = event.parsed();
+    let mut tags = vec![
+        pair("d", parsed.common().d_tag()),
+        pair("title", parsed.common().title()),
+        pair("start", parsed.start_wire()),
+    ];
+    if let Some(end) = parsed.end_wire() {
+        tags.push(pair("end", end));
+    }
+    tags.extend(
+        parsed
+            .observed_day_indices()
+            .iter()
+            .map(|day| pair("D", day.wire_value())),
+    );
+    if let Some(tzid) = parsed.start_tzid() {
+        tags.push(pair("start_tzid", tzid.as_str()));
+    }
+    if let Some(tzid) = parsed.end_tzid() {
+        tags.push(pair("end_tzid", tzid.as_str()));
+    }
+    push_canonical_calendar_common_tags(&mut tags, parsed.common());
+    tags
+}
+
+fn push_canonical_calendar_common_tags(
+    tags: &mut Vec<Vec<String>>,
+    common: &RadrootsParsedNip52CalendarCommon,
+) {
+    tags.extend(
+        common
+            .locations()
+            .iter()
+            .map(|value| pair("location", value)),
+    );
+    if let Some(value) = common.geohash() {
+        tags.push(pair("g", value));
+    }
+    if let Some(value) = common.summary() {
+        tags.push(pair("summary", value));
+    }
+    if let Some(value) = common.image() {
+        tags.push(pair("image", value.as_str()));
+    }
+    for participant in common.participants() {
+        let mut tag = vec!["p".to_string(), participant.pubkey.clone()];
+        if let Some(relay) = &participant.relay {
+            tag.push(relay.clone());
+        }
+        if let Some(role) = &participant.role {
+            if participant.relay.is_none() {
+                tag.push(String::new());
+            }
+            tag.push(role.clone());
+        }
+        tags.push(tag);
+    }
+    tags.extend(common.categories().iter().map(|value| pair("t", value)));
+    tags.extend(
+        common
+            .references()
+            .iter()
+            .map(|value| pair("r", value.as_str())),
+    );
+    for request in common.calendar_requests() {
+        let mut tag = vec!["a".to_string(), request.calendar().as_str().to_string()];
+        if let Some(relay) = request.relay() {
+            tag.push(relay.to_string());
+        }
+        tags.push(tag);
+    }
+}
+
+fn validate_calendar_media(
+    common: &RadrootsParsedNip52CalendarCommon,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    if common.legacy_name().is_some() {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidCalendarProfile);
+    }
+    if let Some(image) = common.image() {
+        validate_primary_media_url(image.as_str(), media)?;
+    }
+    validate_media_urls(common.image().into_iter().map(|url| url.as_str()), media)
+}
+
+fn validate_food_availability(
+    draft: &RadrootsPhase1PublicationDraft,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let tags = RadrootsEventTags::new(draft.tags.clone())
+        .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile)?;
+    let outcome = food_inbound::registry_v7::project_inbound_food_availability_parts(
+        draft.kind,
+        draft.created_at,
+        &tags,
+        &draft.content,
+    )
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile)?;
+    let projection = match outcome {
+        food_inbound::RadrootsFoodAvailabilityProjectionOutcome::Focused(projection) => projection,
+        _ => return Err(RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile),
+    };
+    if !projection.diagnostics().is_empty() {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile);
+    }
+    let mut canonical = vec![
+        pair("d", projection.identifier().as_str()),
+        pair("title", projection.title().as_str()),
+        pair("summary", projection.summary().as_str()),
+        pair("published_at", &projection.published_at().to_string()),
+        pair("location", projection.location().as_str()),
+        vec![
+            "price".to_string(),
+            projection.price().amount().to_string(),
+            projection.price().currency().as_str().to_string(),
+        ],
+        pair("radroots:price_unit", projection.price().unit().as_str()),
+    ];
+    if let Some(quantity) = projection.quantity() {
+        canonical.push(vec![
+            "radroots:quantity".to_string(),
+            quantity.amount().to_string(),
+            quantity.unit().as_str().to_string(),
+        ]);
+    }
+    canonical.push(pair("status", projection.status().as_str()));
+    let mut urls = Vec::new();
+    for image in projection.images() {
+        let (Some(url), Some(dimensions)) = (image.url(), image.dimensions()) else {
+            return Err(RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile);
+        };
+        canonical.push(vec![
+            "image".to_string(),
+            url.to_string(),
+            dimensions.to_string(),
+        ]);
+        validate_primary_media_url(url, media)?;
+        urls.push(url);
+    }
+    if canonical != draft.tags || projection.content().as_str() != draft.content {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidFoodAvailabilityProfile);
+    }
+    validate_media_urls(urls.into_iter(), media)
+}
+
+fn pair(key: &str, value: &str) -> Vec<String> {
+    vec![key.to_string(), value.to_string()]
+}
+
+fn draft_wire_parts(draft: &RadrootsPhase1PublicationDraft) -> RadrootsNip01EventWireParts {
+    RadrootsNip01EventWireParts {
+        kind: draft.kind,
+        content: draft.content.clone(),
+        tags: draft.tags.clone(),
+    }
+}
+
+fn media_reference_for_url<'a>(
+    media: &'a [RadrootsPhase1PublicationMediaReference],
+    url: &str,
+) -> Result<&'a RadrootsPhase1PublicationMediaReference, RadrootsPhase1PublicationArtifactError> {
+    media
+        .binary_search_by(|candidate| candidate.url.as_str().cmp(url))
+        .ok()
+        .map(|index| &media[index])
+        .ok_or(RadrootsPhase1PublicationArtifactError::MediaInventoryMismatch)
+}
+
+fn validate_primary_media_url(
+    url: &str,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    validate_primary_media_reference(media_reference_for_url(media, url)?)
+}
+
+fn validate_primary_media_reference(
+    reference: &RadrootsPhase1PublicationMediaReference,
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    if reference
+        .url
+        .as_blob_url()
+        .hash_path()
+        .extension()
+        .is_none()
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::InvalidMediaReference);
+    }
+    Ok(())
+}
+
+fn validate_media_urls<'a>(
+    urls: impl Iterator<Item = &'a str>,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<(), RadrootsPhase1PublicationArtifactError> {
+    let mut expected = urls.map(str::to_string).collect::<Vec<_>>();
+    expected.sort();
+    expected.dedup();
+    if expected.len() != media.len()
+        || expected
+            .iter()
+            .zip(media)
+            .any(|(url, reference)| url != reference.url.as_str())
+    {
+        return Err(RadrootsPhase1PublicationArtifactError::MediaInventoryMismatch);
+    }
+    Ok(())
+}
+
+#[derive(Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+struct DraftWire {
+    created_at: u64,
+    kind: u32,
+    tags: Vec<Vec<String>>,
+    content: String,
+}
+
+#[derive(Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+struct MediaReferenceWire {
+    url: String,
+    sha256: String,
+    size: u64,
+    media_type: String,
+}
+
+#[derive(Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct ArtifactWire {
+    schema_version: u32,
+    semantic_variant: String,
+    authored_operation_id: String,
+    event_contract_id: String,
+    expected_author: String,
+    draft: DraftWire,
+    expected_event_id: String,
+    media_references: Vec<MediaReferenceWire>,
+    artifact_digest: String,
+}
+
+#[derive(Serialize)]
+struct ArtifactPayloadWire<'a> {
+    schema_version: u32,
+    semantic_variant: &'a str,
+    authored_operation_id: &'a str,
+    event_contract_id: &'a str,
+    expected_author: &'a str,
+    draft: DraftWire,
+    expected_event_id: &'a str,
+    media_references: Vec<MediaReferenceWire>,
+}
+
+fn artifact_payload_wire<'a>(
+    variant: RadrootsPhase1PublicationSemanticVariant,
+    author: &'a RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &'a RadrootsEventId,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> ArtifactPayloadWire<'a> {
+    ArtifactPayloadWire {
+        schema_version: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION,
+        semantic_variant: variant.as_str(),
+        authored_operation_id: variant.authored_operation_id(),
+        event_contract_id: variant.event_contract_id(),
+        expected_author: author.as_str(),
+        draft: DraftWire {
+            created_at: draft.created_at,
+            kind: draft.kind,
+            tags: draft.tags.clone(),
+            content: draft.content.clone(),
+        },
+        expected_event_id: expected_event_id.as_str(),
+        media_references: media
+            .iter()
+            .map(RadrootsPhase1PublicationMediaReference::to_wire)
+            .collect(),
+    }
+}
+
+fn compute_artifact_digest(
+    variant: RadrootsPhase1PublicationSemanticVariant,
+    author: &RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &RadrootsEventId,
+    media: &[RadrootsPhase1PublicationMediaReference],
+) -> Result<RadrootsPhase1PublicationArtifactDigest, RadrootsPhase1PublicationArtifactError> {
+    let payload = serde_json::to_vec(&artifact_payload_wire(
+        variant,
+        author,
+        draft,
+        expected_event_id,
+        media,
+    ))
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::Serialization)?;
+    let mut hasher = Sha256::new();
+    hasher.update(ARTIFACT_DIGEST_DOMAIN);
+    hasher.update(ARTIFACT_DIGEST_DOMAIN_TERMINATOR);
+    hasher.update(payload);
+    Ok(RadrootsPhase1PublicationArtifactDigest(
+        hasher.finalize().into(),
+    ))
+}
+
+fn serialize_artifact(
+    variant: RadrootsPhase1PublicationSemanticVariant,
+    author: &RadrootsPublicKey,
+    draft: &RadrootsPhase1PublicationDraft,
+    expected_event_id: &RadrootsEventId,
+    media: &[RadrootsPhase1PublicationMediaReference],
+    digest: RadrootsPhase1PublicationArtifactDigest,
+) -> Result<Vec<u8>, RadrootsPhase1PublicationArtifactError> {
+    let payload = artifact_payload_wire(variant, author, draft, expected_event_id, media);
+    serde_json::to_vec(&ArtifactWire {
+        schema_version: payload.schema_version,
+        semantic_variant: payload.semantic_variant.to_string(),
+        authored_operation_id: payload.authored_operation_id.to_string(),
+        event_contract_id: payload.event_contract_id.to_string(),
+        expected_author: payload.expected_author.to_string(),
+        draft: payload.draft,
+        expected_event_id: payload.expected_event_id.to_string(),
+        media_references: payload.media_references,
+        artifact_digest: digest.to_hex(),
+    })
+    .map_err(|_| RadrootsPhase1PublicationArtifactError::Serialization)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const AUTHOR: &str = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
+
+    #[test]
+    fn signed_event_wire_size_accepts_exact_limit_and_rejects_one_over() {
+        let author = RadrootsPublicKey::parse(AUTHOR).unwrap();
+        let mut draft = RadrootsPhase1PublicationDraft {
+            created_at: 1_784_347_200,
+            kind: KIND_POST,
+            tags: Vec::new(),
+            content: String::new(),
+        };
+        let empty_id = event_id(&author, &draft);
+        let base = signed_event_wire_size(&author, &draft, &empty_id).unwrap();
+        let available = RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES - base;
+        draft.content = "\0".repeat(available / 6) + &"x".repeat(available % 6);
+        assert!(draft.content.len() <= DEFAULT_CONTENT_MAX_BYTES);
+
+        let exact_id = event_id(&author, &draft);
+        assert_eq!(
+            signed_event_wire_size(&author, &draft, &exact_id).unwrap(),
+            RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES
+        );
+        validate_signed_event_wire_size(&author, &draft, &exact_id).unwrap();
+
+        draft.content.push('x');
+        let oversized_id = event_id(&author, &draft);
+        assert_eq!(
+            validate_signed_event_wire_size(&author, &draft, &oversized_id),
+            Err(RadrootsPhase1PublicationArtifactError::EventWireTooLarge {
+                max: RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES,
+                actual: RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES + 1,
+            })
+        );
+    }
+
+    #[test]
+    fn publication_artifact_digest_has_exactly_one_nul_domain_terminator() {
+        let author = RadrootsPublicKey::parse(AUTHOR).unwrap();
+        let draft = RadrootsPhase1PublicationDraft {
+            created_at: 1_784_347_200,
+            kind: KIND_POST,
+            tags: Vec::new(),
+            content: "Carrots harvested today".to_string(),
+        };
+        let expected_event_id = event_id(&author, &draft);
+        let payload = serde_json::to_vec(&artifact_payload_wire(
+            RadrootsPhase1PublicationSemanticVariant::Update,
+            &author,
+            &draft,
+            &expected_event_id,
+            &[],
+        ))
+        .unwrap();
+        let actual = compute_artifact_digest(
+            RadrootsPhase1PublicationSemanticVariant::Update,
+            &author,
+            &draft,
+            &expected_event_id,
+            &[],
+        )
+        .unwrap();
+
+        let mut exact = Sha256::new();
+        exact.update(b"radroots.phase1.publication-artifact.v1");
+        exact.update([0]);
+        exact.update(&payload);
+        let exact: [u8; 32] = exact.finalize().into();
+        assert_eq!(actual.as_bytes(), &exact);
+
+        for prefix in [
+            b"radroots.phase1.publication-artifact.v1".as_slice(),
+            b"radroots.phase1.publication-artifact.v1\0\0".as_slice(),
+        ] {
+            let mut alternate = Sha256::new();
+            alternate.update(prefix);
+            alternate.update(&payload);
+            let alternate: [u8; 32] = alternate.finalize().into();
+            assert_ne!(actual.as_bytes(), &alternate);
+        }
+    }
+
+    fn event_id(
+        author: &RadrootsPublicKey,
+        draft: &RadrootsPhase1PublicationDraft,
+    ) -> RadrootsEventId {
+        compute_canonical_nip01_event_id(
+            author.as_str(),
+            draft.created_at,
+            draft.kind,
+            &draft.tags,
+            &draft.content,
+        )
+        .unwrap()
+    }
+}
diff --git a/crates/event_codec/tests/codec_error_job.rs b/crates/event_codec/tests/codec_error_job.rs
@@ -1,6 +1,7 @@
 #[path = "../src/test_fixtures.rs"]
 mod test_fixtures;
 
+#[cfg(feature = "std")]
 use std::error::Error as _;
 
 use radroots_event_codec::error::{EventEncodeError, EventParseError};
@@ -20,11 +21,13 @@ fn parse_error_display_and_source_cover_variants() {
     let missing = EventParseError::MissingTag("d");
     assert_eq!(missing.to_string(), "missing tag: d");
     assert_eq!(missing.code(), "missing_tag");
+    #[cfg(feature = "std")]
     assert!(missing.source().is_none());
 
     let invalid = EventParseError::InvalidTag("a");
     assert_eq!(invalid.to_string(), "invalid tag structure for 'a'");
     assert_eq!(invalid.code(), "invalid_tag");
+    #[cfg(feature = "std")]
     assert!(invalid.source().is_none());
 
     let invalid_kind = EventParseError::InvalidKind {
@@ -33,6 +36,7 @@ fn parse_error_display_and_source_cover_variants() {
     };
     assert_eq!(invalid_kind.to_string(), "invalid kind 1 (expected 30340)");
     assert_eq!(invalid_kind.code(), "invalid_kind");
+    #[cfg(feature = "std")]
     assert!(invalid_kind.source().is_none());
 
     let parse_int = "x".parse::<u32>().expect_err("parse int error");
@@ -43,11 +47,13 @@ fn parse_error_display_and_source_cover_variants() {
             .contains("invalid number in 'count'")
     );
     assert_eq!(invalid_number.code(), "invalid_number");
+    #[cfg(feature = "std")]
     assert!(invalid_number.source().is_some());
 
     let invalid_json = EventParseError::InvalidJson("content");
     assert_eq!(invalid_json.to_string(), "invalid JSON in 'content'");
     assert_eq!(invalid_json.code(), "invalid_json");
+    #[cfg(feature = "std")]
     assert!(invalid_json.source().is_none());
 }
 
@@ -148,14 +154,17 @@ fn job_encode_error_display_covers_variants() {
 fn job_parse_error_display_and_source_covers_variants() {
     let kind = JobParseError::KindOutOfRange(u32::from(u16::MAX) + 1);
     assert!(kind.to_string().contains("Nostr event kind"));
+    #[cfg(feature = "std")]
     assert!(kind.source().is_none());
 
     let missing = JobParseError::MissingTag("e");
     assert_eq!(missing.to_string(), "missing tag: e");
+    #[cfg(feature = "std")]
     assert!(missing.source().is_none());
 
     let invalid = JobParseError::InvalidTag("status");
     assert_eq!(invalid.to_string(), "invalid tag structure for 'status'");
+    #[cfg(feature = "std")]
     assert!(invalid.source().is_none());
 
     let invalid_number = JobParseError::InvalidNumber("amount", "x".parse::<u32>().unwrap_err());
@@ -164,17 +173,21 @@ fn job_parse_error_display_and_source_covers_variants() {
             .to_string()
             .contains("invalid number in 'amount'")
     );
+    #[cfg(feature = "std")]
     assert!(invalid_number.source().is_some());
 
     let non_whole = JobParseError::NonWholeSats("amount");
     assert!(non_whole.to_string().contains("whole number of sats"));
+    #[cfg(feature = "std")]
     assert!(non_whole.source().is_none());
 
     let overflow = JobParseError::AmountOverflow("amount");
     assert!(overflow.to_string().contains("does not fit u32 sat"));
+    #[cfg(feature = "std")]
     assert!(overflow.source().is_none());
 
     let missing_chain = JobParseError::MissingChainTag("e");
     assert_eq!(missing_chain.to_string(), "missing required chain tag: e");
+    #[cfg(feature = "std")]
     assert!(missing_chain.source().is_none());
 }
diff --git a/crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json b/crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json
@@ -0,0 +1,335 @@
+{
+  "suite": "phase1_publication_artifact",
+  "contract_version": "1.0.0",
+  "vectors": [
+    {
+      "id": "profile_round_trip",
+      "kind": "publication_artifact.build_profile.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "semantic_variant": "profile",
+        "operation_id": "profile.build_authored_draft",
+        "contract_id": "radroots.profile.metadata.v1",
+        "event_kind": 0,
+        "media_count": 2,
+        "expected_event_id": "a7d081b9c142e3a68245bafe1921b0e0dd88f886406e7165a9729f6c57026289",
+        "artifact_digest": "e296ed63312d58b4e3ee160d4ca3457eb922920d3116329ca498f08e402215b0",
+        "canonical_json_bytes": 1305,
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"profile\",\"authored_operation_id\":\"profile.build_authored_draft\",\"event_contract_id\":\"radroots.profile.metadata.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":0,\"tags\":[],\"content\":\"{\\\"name\\\":\\\"victoria-farm\\\",\\\"display_name\\\":\\\"Victoria Farm\\\",\\\"about\\\":\\\"Seasonal produce from the Saanich Peninsula\\\",\\\"picture\\\":\\\"https://media.example/512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a.png\\\",\\\"banner\\\":\\\"https://media.example/fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145.webp\\\",\\\"nip05\\\":\\\"farm@example.com\\\",\\\"bot\\\":false}\"},\"expected_event_id\":\"a7d081b9c142e3a68245bafe1921b0e0dd88f886406e7165a9729f6c57026289\",\"media_references\":[{\"url\":\"https://media.example/512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a.png\",\"sha256\":\"512f6a371c77694502e7d08f0b1f1080c7103ca90925bfe2fa23106aac11003a\",\"size\":15,\"media_type\":\"image/png\"},{\"url\":\"https://media.example/fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145.webp\",\"sha256\":\"fbf3819415a76ea0d3ba71817578bb89c4903aa958e38f76f86578dfa8a35145\",\"size\":14,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"e296ed63312d58b4e3ee160d4ca3457eb922920d3116329ca498f08e402215b0\"}"
+      }
+    },
+    {
+      "id": "update_round_trip",
+      "kind": "publication_artifact.build_update.valid",
+      "input": { "fixture": "update" },
+      "expected": {
+        "semantic_variant": "update",
+        "operation_id": "social.update.build_authored_draft",
+        "contract_id": "radroots.social.update.v1",
+        "event_kind": 1,
+        "media_count": 0,
+        "expected_event_id": "7f2d9dbbd6d2f3db1e83338ea2e669b2458e62ded159de15a3fa98dcf9f164e3",
+        "artifact_digest": "9ad318496bd4a710fbc7f3e0f6d5a01de808d352db91ca56a12e710904784cc5",
+        "canonical_json_bytes": 525,
+        "canonical_json_sha256": "21be0d18a7f5812f7fa14600f46e0948480d2525eb1dcab416bb4ef99ca731c6",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"update\",\"authored_operation_id\":\"social.update.build_authored_draft\",\"event_contract_id\":\"radroots.social.update.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[],\"content\":\"Carrots harvested today\"},\"expected_event_id\":\"7f2d9dbbd6d2f3db1e83338ea2e669b2458e62ded159de15a3fa98dcf9f164e3\",\"media_references\":[],\"artifact_digest\":\"9ad318496bd4a710fbc7f3e0f6d5a01de808d352db91ca56a12e710904784cc5\"}"
+      }
+    },
+    {
+      "id": "photo_update_round_trip",
+      "kind": "publication_artifact.build_photo_update.valid",
+      "input": { "fixture": "photo_update" },
+      "expected": {
+        "semantic_variant": "photo_update",
+        "operation_id": "social.photo_update.build_authored_draft",
+        "contract_id": "radroots.social.photo_update.v1",
+        "event_kind": 1,
+        "media_count": 2,
+        "expected_event_id": "e592229776cd2a0d0e25a701f4629c0a5dc6e08481a235623d50da6ee8e8f438",
+        "artifact_digest": "9ed6b7a6fcec3b07bd0c9179fd5b6ecf74517390051e3c2bd1659be62a26c197",
+        "canonical_json_bytes": 1415,
+        "canonical_json_sha256": "38caab5242ae70fe2e36b39658dba7e6f723b2bd4fa512c8f166387c17faf69c",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"photo_update\",\"authored_operation_id\":\"social.photo_update.build_authored_draft\",\"event_contract_id\":\"radroots.social.photo_update.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[[\"imeta\",\"url https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"x 51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"m image/webp\",\"dim 1200x900\",\"size 13\",\"alt Fresh strawberries\",\"fallback https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"]],\"content\":\"Strawberries at the farm stand https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"},\"expected_event_id\":\"e592229776cd2a0d0e25a701f4629c0a5dc6e08481a235623d50da6ee8e8f438\",\"media_references\":[{\"url\":\"https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"},{\"url\":\"https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"9ed6b7a6fcec3b07bd0c9179fd5b6ecf74517390051e3c2bd1659be62a26c197\"}"
+      }
+    },
+    {
+      "id": "ask_round_trip_with_fallback",
+      "kind": "publication_artifact.build_ask.valid",
+      "input": { "fixture": "ask" },
+      "expected": {
+        "semantic_variant": "ask",
+        "operation_id": "social.ask.build_authored_draft",
+        "contract_id": "radroots.social.ask.v1",
+        "event_kind": 1,
+        "media_count": 2,
+        "expected_event_id": "bd45fbbb5bfb8a5aa32df81d240e5f3bd56b0f8cde3a20b3f7d455801373fe48",
+        "artifact_digest": "41eddea199bba97adebef4ce433ebfa05d97978ce8464ed3d52762ab717c2a3c",
+        "canonical_json_bytes": 1411,
+        "canonical_json_sha256": "4985ad0919758e3747f0548409854deb77b9734825ab597623e5c6b566e2d5c7",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"ask\",\"authored_operation_id\":\"social.ask.build_authored_draft\",\"event_contract_id\":\"radroots.social.ask.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":1,\"tags\":[[\"t\",\"radroots-ask\"],[\"imeta\",\"url https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"x 51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"m image/webp\",\"dim 1200x900\",\"size 13\",\"alt Fresh strawberries\",\"fallback https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"]],\"content\":\"When will strawberries be ready? https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\"},\"expected_event_id\":\"bd45fbbb5bfb8a5aa32df81d240e5f3bd56b0f8cde3a20b3f7d455801373fe48\",\"media_references\":[{\"url\":\"https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"},{\"url\":\"https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp\",\"sha256\":\"51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0\",\"size\":13,\"media_type\":\"image/webp\"}],\"artifact_digest\":\"41eddea199bba97adebef4ce433ebfa05d97978ce8464ed3d52762ab717c2a3c\"}"
+      }
+    },
+    {
+      "id": "event_date_round_trip",
+      "kind": "publication_artifact.build_calendar_date_event.valid",
+      "input": { "fixture": "event_date" },
+      "expected": {
+        "semantic_variant": "event_date",
+        "operation_id": "social.calendar_date_event.build_authored_draft",
+        "contract_id": "radroots.calendar.date_event.v1",
+        "event_kind": 31922,
+        "media_count": 1,
+        "expected_event_id": "bea82662b6acf2f1272c8335a24bb0957e35d22c2b29d3e30c094ad7398dc7c7",
+        "artifact_digest": "0ec5162ab80988999aac62329d4cfc9c7efce6a82bbda539a723347d73596eb3",
+        "canonical_json_bytes": 1013,
+        "canonical_json_sha256": "46b015e34556762f3d7ca592cd3dc6d4d5652ff085c7d8a8dc458d5897cf0b22",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"event_date\",\"authored_operation_id\":\"social.calendar_date_event.build_authored_draft\",\"event_contract_id\":\"radroots.calendar.date_event.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":31922,\"tags\":[[\"d\",\"farmers-market-2026\"],[\"title\",\"Moss Street Farmers Market\"],[\"start\",\"2026-07-25\"],[\"end\",\"2026-07-26\"],[\"location\",\"Victoria, BC\"],[\"image\",\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\"]],\"content\":\"Saturday market in Victoria\"},\"expected_event_id\":\"bea82662b6acf2f1272c8335a24bb0957e35d22c2b29d3e30c094ad7398dc7c7\",\"media_references\":[{\"url\":\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\",\"sha256\":\"0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8\",\"size\":10,\"media_type\":\"image/jpeg\"}],\"artifact_digest\":\"0ec5162ab80988999aac62329d4cfc9c7efce6a82bbda539a723347d73596eb3\"}"
+      }
+    },
+    {
+      "id": "event_time_round_trip",
+      "kind": "publication_artifact.build_calendar_time_event.valid",
+      "input": { "fixture": "event_time" },
+      "expected": {
+        "semantic_variant": "event_time",
+        "operation_id": "social.calendar_time_event.build_authored_draft",
+        "contract_id": "radroots.calendar.time_event.v1",
+        "event_kind": 31923,
+        "media_count": 1,
+        "expected_event_id": "2088ed11cd8c1495a82e6f5198ed2ee98e0cbc599f22d7f3380892155dc55894",
+        "artifact_digest": "56bfb4bed87559a58922343905a73c0c96dd0a57f94ff0955caecf0589198638",
+        "canonical_json_bytes": 1013,
+        "canonical_json_sha256": "58e3c7e684bc774c35b08b246075076b5286d51639eb0651ed5b6362d958639e",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"event_time\",\"authored_operation_id\":\"social.calendar_time_event.build_authored_draft\",\"event_contract_id\":\"radroots.calendar.time_event.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":31923,\"tags\":[[\"d\",\"farm-tour-2026\"],[\"title\",\"Saanich Farm Tour\"],[\"start\",\"1785003600\"],[\"end\",\"1785007200\"],[\"D\",\"20659\"],[\"start_tzid\",\"America/Vancouver\"],[\"image\",\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\"]],\"content\":\"A one-hour farm tour\"},\"expected_event_id\":\"2088ed11cd8c1495a82e6f5198ed2ee98e0cbc599f22d7f3380892155dc55894\",\"media_references\":[{\"url\":\"https://events.example/0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8.jpeg\",\"sha256\":\"0a422cbf828d421341c40c678f4cfbd6451841760db126e5f5ac3d2e06fd80b8\",\"size\":10,\"media_type\":\"image/jpeg\"}],\"artifact_digest\":\"56bfb4bed87559a58922343905a73c0c96dd0a57f94ff0955caecf0589198638\"}"
+      }
+    },
+    {
+      "id": "food_availability_round_trip",
+      "kind": "publication_artifact.build_food_availability.valid",
+      "input": { "fixture": "food_availability" },
+      "expected": {
+        "semantic_variant": "food_availability",
+        "operation_id": "food_availability.build_authored_draft",
+        "contract_id": "radroots.food.availability.v1",
+        "event_kind": 30402,
+        "media_count": 1,
+        "expected_event_id": "76b60f1b178c0dbdc14a87de36151ea6b04a866ce50e34a0ccae2f406f514e81",
+        "artifact_digest": "f0989cb993194af4a2f907ad8337e50378d2757c536a09afb4055a681043a7d8",
+        "canonical_json_bytes": 1132,
+        "canonical_json_sha256": "525dc96e87b79b1ef3aa67c711cccd8b8e6c205665770ebcb8283035b7b496da",
+        "canonical_json": "{\"schema_version\":1,\"semantic_variant\":\"food_availability\",\"authored_operation_id\":\"food_availability.build_authored_draft\",\"event_contract_id\":\"radroots.food.availability.v1\",\"expected_author\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"draft\":{\"created_at\":1784347200,\"kind\":30402,\"tags\":[[\"d\",\"nantes-carrots\"],[\"title\",\"Nantes Carrots\"],[\"summary\",\"Fresh bunches\"],[\"published_at\",\"1784347140\"],[\"location\",\"Central Saanich, BC\"],[\"price\",\"3\",\"CAD\"],[\"radroots:price_unit\",\"lb\"],[\"radroots:quantity\",\"24\",\"lb\"],[\"status\",\"active\"],[\"image\",\"https://food.example/8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e.png\",\"1200x800\"]],\"content\":\"Fresh Nantes carrots available this week.\"},\"expected_event_id\":\"76b60f1b178c0dbdc14a87de36151ea6b04a866ce50e34a0ccae2f406f514e81\",\"media_references\":[{\"url\":\"https://food.example/8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e.png\",\"sha256\":\"8a66441b557b29193781023160b0216c5518e9b84749f29ecf118a728f451a5e\",\"size\":14,\"media_type\":\"image/png\"}],\"artifact_digest\":\"f0989cb993194af4a2f907ad8337e50378d2757c536a09afb4055a681043a7d8\"}"
+      }
+    },
+    {
+      "id": "canonical_json_serialization",
+      "kind": "publication_artifact.to_canonical_json.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "canonical_json_bytes": 1305,
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8"
+      }
+    },
+    {
+      "id": "canonical_json_reload",
+      "kind": "publication_artifact.from_canonical_json.valid",
+      "input": { "fixture": "profile" },
+      "expected": {
+        "semantic_variant": "profile",
+        "canonical_json_sha256": "131d8131bb821179e6fd64c5201d01bee384451d09c20d789860439ef05620e8"
+      }
+    },
+    {
+      "id": "leading_whitespace_is_noncanonical",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "leading_whitespace" },
+      "expected": { "error": "publication_artifact_non_canonical_json" }
+    },
+    {
+      "id": "artifact_exact_byte_limit_reaches_parser",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "artifact_exact_byte_limit" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "artifact_one_byte_over_limit_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "artifact_one_over_byte_limit" },
+      "expected": { "error": "publication_artifact_too_large" }
+    },
+    {
+      "id": "unknown_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "unknown_draft_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_draft_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "nested_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "nested_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "missing_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "missing_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "malformed_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "malformed_expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_invalid" }
+    },
+    {
+      "id": "uppercase_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "uppercase_expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_invalid" }
+    },
+    {
+      "id": "duplicate_expected_event_id_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "duplicate_expected_event_id" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "unknown_media_field_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "unknown_media_field" },
+      "expected": { "error": "publication_artifact_invalid_json" }
+    },
+    {
+      "id": "json_field_order_is_noncanonical",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "json_field_order" },
+      "expected": { "error": "publication_artifact_non_canonical_json" }
+    },
+    {
+      "id": "unknown_version_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "schema_version" },
+      "expected": { "error": "publication_artifact_version_unsupported" }
+    },
+    {
+      "id": "cross_variant_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "all_cross_variants" },
+      "expected": { "error": "publication_authored_operation_mismatch" }
+    },
+    {
+      "id": "operation_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "operation_id" },
+      "expected": { "error": "publication_authored_operation_mismatch" }
+    },
+    {
+      "id": "contract_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "contract_id" },
+      "expected": { "error": "publication_event_contract_mismatch" }
+    },
+    {
+      "id": "kind_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "kind" },
+      "expected": { "error": "publication_kind_mismatch" }
+    },
+    {
+      "id": "author_mismatch_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "author" },
+      "expected": { "error": "publication_expected_author_invalid" }
+    },
+    {
+      "id": "created_at_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "created_at" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "draft_tags_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "draft_tags" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "draft_content_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "draft_content" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "noncanonical_nip05_is_rejected_after_id_rebuild",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "noncanonical_nip05" },
+      "expected": { "error": "publication_profile_invalid" }
+    },
+    {
+      "id": "empty_ask_content_is_rejected_after_id_rebuild",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "ask", "mutation": "empty_ask_content" },
+      "expected": { "error": "publication_post_profile_invalid" }
+    },
+    {
+      "id": "expected_event_id_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "expected_event_id" },
+      "expected": { "error": "publication_expected_event_id_mismatch" }
+    },
+    {
+      "id": "digest_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "digest" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "media_order_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_order" },
+      "expected": { "error": "publication_media_inventory_non_canonical" }
+    },
+    {
+      "id": "profile_media_commitment_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_size" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "media_url_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_url" },
+      "expected": { "error": "publication_media_inventory_mismatch" }
+    },
+    {
+      "id": "noncanonical_media_url_casing_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_url_casing" },
+      "expected": { "error": "publication_media_reference_invalid" }
+    },
+    {
+      "id": "media_hash_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_hash" },
+      "expected": { "error": "publication_media_reference_invalid" }
+    },
+    {
+      "id": "media_type_tamper_is_rejected",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "profile", "mutation": "media_type" },
+      "expected": { "error": "publication_artifact_digest_mismatch" }
+    },
+    {
+      "id": "post_media_commitment_must_match_imeta",
+      "kind": "publication_artifact.from_canonical_json.invalid",
+      "input": { "fixture": "photo_update", "mutation": "media_size" },
+      "expected": { "error": "publication_media_inventory_mismatch" }
+    }
+  ]
+}
diff --git a/crates/event_codec/tests/publication_artifact.rs b/crates/event_codec/tests/publication_artifact.rs
@@ -0,0 +1,936 @@
+#![cfg(feature = "serde_json")]
+
+use radroots_blossom::{
+    RadrootsBlossomBlobDescriptor, RadrootsBlossomBlobUrl, RadrootsBlossomByteVerifiedDescriptor,
+    RadrootsBlossomMediaType, RadrootsBlossomSha256,
+};
+use radroots_event::{
+    RadrootsAuthoredImage,
+    calendar::{
+        RadrootsAuthoredCalendarDateEvent, RadrootsAuthoredCalendarTimeEvent, RadrootsCalendarDate,
+    },
+    food_availability::{
+        RadrootsFoodAvailabilityDetails, RadrootsFoodAvailabilityDetailsParts,
+        RadrootsFoodAvailabilityImage, RadrootsFoodAvailabilityStatus, RadrootsFoodContent,
+        RadrootsFoodCurrency, RadrootsFoodIdentifier, RadrootsFoodImageDimensions,
+        RadrootsFoodPrice, RadrootsFoodPublishedAt, RadrootsFoodQuantity, RadrootsFoodText,
+        RadrootsFoodUnit,
+    },
+    post::{
+        RadrootsAuthoredAsk, RadrootsAuthoredPhotoUpdate, RadrootsAuthoredPostImage,
+        RadrootsAuthoredUpdate, RadrootsPostImageDimensions,
+    },
+    profile::{RadrootsAuthoredProfile, RadrootsNip05Identifier},
+    wire::compute_canonical_nip01_event_id,
+};
+use radroots_event_codec::wire::publication::{
+    RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES, RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT,
+    RadrootsPhase1PublicationArtifact, RadrootsPhase1PublicationArtifactError,
+    RadrootsPhase1PublicationEventVariant, RadrootsPhase1PublicationSemanticVariant,
+    validate_phase1_publication_artifact,
+};
+use serde::Deserialize;
+use serde_json::Value;
+
+const AUTHOR: &str = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
+const CREATED_AT: u64 = 1_784_347_200;
+
+const PUBLICATION_ARTIFACT_VECTOR: &str =
+    include_str!("fixtures/phase1_publication_artifact.v1.json");
+
+#[derive(Deserialize)]
+struct VectorSuite {
+    suite: String,
+    contract_version: String,
+    vectors: Vec<VectorCase>,
+}
+
+#[derive(Deserialize)]
+struct VectorCase {
+    id: String,
+    kind: String,
+    input: VectorInput,
+    expected: VectorExpected,
+}
+
+#[derive(Deserialize)]
+struct VectorInput {
+    fixture: String,
+    mutation: Option<String>,
+}
+
+#[derive(Deserialize)]
+struct VectorExpected {
+    semantic_variant: Option<String>,
+    operation_id: Option<String>,
+    contract_id: Option<String>,
+    event_kind: Option<u32>,
+    media_count: Option<usize>,
+    expected_event_id: Option<String>,
+    artifact_digest: Option<String>,
+    canonical_json_bytes: Option<usize>,
+    canonical_json_sha256: Option<String>,
+    canonical_json: Option<String>,
+    error: Option<String>,
+}
+
+#[test]
+fn publication_artifact_conformance_vector_executes_every_case() {
+    let suite: VectorSuite = serde_json::from_str(PUBLICATION_ARTIFACT_VECTOR).unwrap();
+    assert_eq!(suite.suite, "phase1_publication_artifact");
+    assert_eq!(suite.contract_version, "1.0.0");
+    assert_eq!(suite.vectors.len(), 41);
+    let artifacts = all_artifacts();
+
+    for case in suite.vectors {
+        let artifact = artifact_fixture(&artifacts, &case.input.fixture);
+        match case.kind.as_str() {
+            kind if kind.starts_with("publication_artifact.build_") && kind.ends_with(".valid") => {
+                assert_eq!(case.input.mutation, None, "{}", case.id);
+                assert_eq!(
+                    artifact.semantic_variant().as_str(),
+                    case.expected.semantic_variant.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.authored_operation_id(),
+                    case.expected.operation_id.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.event_contract_id(),
+                    case.expected.contract_id.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.draft().kind(),
+                    case.expected.event_kind.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.media_references().len(),
+                    case.expected.media_count.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.expected_event_id().as_str(),
+                    case.expected.expected_event_id.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.artifact_digest().to_string(),
+                    case.expected.artifact_digest.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.to_canonical_json().len(),
+                    case.expected.canonical_json_bytes.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    RadrootsBlossomSha256::digest(&artifact.to_canonical_json()).to_hex(),
+                    case.expected.canonical_json_sha256.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    artifact.to_canonical_json(),
+                    case.expected.canonical_json.unwrap().as_bytes(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    RadrootsPhase1PublicationArtifact::from_canonical_json(
+                        &artifact.to_canonical_json()
+                    )
+                    .unwrap(),
+                    *artifact,
+                    "{}",
+                    case.id
+                );
+            }
+            "publication_artifact.to_canonical_json.valid" => {
+                assert_eq!(case.input.mutation, None, "{}", case.id);
+                let bytes = artifact.to_canonical_json();
+                assert_eq!(
+                    bytes.len(),
+                    case.expected.canonical_json_bytes.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    RadrootsBlossomSha256::digest(&bytes).to_hex(),
+                    case.expected.canonical_json_sha256.unwrap(),
+                    "{}",
+                    case.id
+                );
+            }
+            "publication_artifact.from_canonical_json.valid" => {
+                assert_eq!(case.input.mutation, None, "{}", case.id);
+                let bytes = artifact.to_canonical_json();
+                let reloaded =
+                    RadrootsPhase1PublicationArtifact::from_canonical_json(&bytes).unwrap();
+                assert_eq!(
+                    reloaded.semantic_variant().as_str(),
+                    case.expected.semantic_variant.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(
+                    RadrootsBlossomSha256::digest(&reloaded.to_canonical_json()).to_hex(),
+                    case.expected.canonical_json_sha256.unwrap(),
+                    "{}",
+                    case.id
+                );
+                assert_eq!(reloaded, *artifact, "{}", case.id);
+            }
+            "publication_artifact.from_canonical_json.invalid" => {
+                if case.input.mutation.as_deref() == Some("all_cross_variants") {
+                    assert_every_cross_variant_is_rejected(
+                        &artifacts,
+                        case.expected.error.as_deref().unwrap(),
+                        &case.id,
+                    );
+                    continue;
+                }
+                let bytes = mutate_artifact(
+                    &artifact.to_canonical_json(),
+                    case.input.mutation.as_deref().unwrap(),
+                );
+                assert_eq!(
+                    RadrootsPhase1PublicationArtifact::from_canonical_json(&bytes)
+                        .unwrap_err()
+                        .code(),
+                    case.expected.error.as_deref().unwrap(),
+                    "{}",
+                    case.id
+                );
+            }
+            other => panic!("{} has unknown case kind {other}", case.id),
+        }
+    }
+}
+
+#[test]
+fn publication_artifact_round_trips_every_closed_variant() {
+    let artifacts = all_artifacts();
+    let expected = [
+        (
+            RadrootsPhase1PublicationSemanticVariant::Profile,
+            "profile.build_authored_draft",
+            "radroots.profile.metadata.v1",
+            0,
+            2,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::Update,
+            "social.update.build_authored_draft",
+            "radroots.social.update.v1",
+            1,
+            0,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::PhotoUpdate,
+            "social.photo_update.build_authored_draft",
+            "radroots.social.photo_update.v1",
+            1,
+            2,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::Ask,
+            "social.ask.build_authored_draft",
+            "radroots.social.ask.v1",
+            1,
+            2,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::Event(
+                RadrootsPhase1PublicationEventVariant::Date,
+            ),
+            "social.calendar_date_event.build_authored_draft",
+            "radroots.calendar.date_event.v1",
+            31_922,
+            1,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::Event(
+                RadrootsPhase1PublicationEventVariant::Time,
+            ),
+            "social.calendar_time_event.build_authored_draft",
+            "radroots.calendar.time_event.v1",
+            31_923,
+            1,
+        ),
+        (
+            RadrootsPhase1PublicationSemanticVariant::FoodAvailability,
+            "food_availability.build_authored_draft",
+            "radroots.food.availability.v1",
+            30_402,
+            1,
+        ),
+    ];
+
+    for (artifact, (variant, operation, contract, kind, media_count)) in
+        artifacts.iter().zip(expected)
+    {
+        assert_eq!(artifact.semantic_variant(), variant);
+        assert_eq!(artifact.authored_operation_id(), operation);
+        assert_eq!(artifact.event_contract_id(), contract);
+        assert_eq!(artifact.expected_author().as_str(), AUTHOR);
+        assert_eq!(artifact.draft().kind(), kind);
+        assert_eq!(artifact.media_references().len(), media_count);
+        let canonical_json = artifact.to_canonical_json();
+        assert!(canonical_json.len() <= RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES);
+        let reloaded =
+            RadrootsPhase1PublicationArtifact::from_canonical_json(&canonical_json).unwrap();
+        assert_eq!(&reloaded, artifact);
+        assert_eq!(reloaded.to_canonical_json(), canonical_json);
+        validate_phase1_publication_artifact(artifact).unwrap();
+    }
+}
+
+#[test]
+fn publication_artifact_inventory_uses_full_urls_and_includes_ask_fallbacks() {
+    let ask = &all_artifacts()[3];
+    let urls = ask
+        .media_references()
+        .iter()
+        .map(|reference| reference.url().as_str())
+        .collect::<Vec<_>>();
+    assert_eq!(
+        urls,
+        vec![
+            "https://backup.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp",
+            "https://media.example/51bcf96cda2475475246e3a994aabfee7ff9d7694ba0db9bdc74408632827ad0.webp",
+        ]
+    );
+    assert_eq!(
+        ask.media_references()[0].sha256(),
+        ask.media_references()[1].sha256()
+    );
+}
+
+#[test]
+fn publication_artifact_accepts_text_only_ask() {
+    let ask = RadrootsAuthoredAsk::new("When will the carrots be ready?", Vec::new()).unwrap();
+    let artifact = RadrootsPhase1PublicationArtifact::from_ask(&ask, CREATED_AT, AUTHOR).unwrap();
+    assert!(artifact.media_references().is_empty());
+    assert_eq!(
+        artifact.semantic_variant(),
+        RadrootsPhase1PublicationSemanticVariant::Ask
+    );
+    assert_eq!(
+        RadrootsPhase1PublicationArtifact::from_canonical_json(&artifact.to_canonical_json())
+            .unwrap(),
+        artifact
+    );
+}
+
+#[test]
+fn publication_artifact_reload_rejects_cross_variant_and_every_envelope_tamper() {
+    let artifact = &all_artifacts()[0];
+    let canonical = artifact.to_canonical_json();
+
+    let mut leading_space = vec![b' '];
+    leading_space.extend_from_slice(&canonical);
+    assert_error(
+        &leading_space,
+        RadrootsPhase1PublicationArtifactError::NonCanonicalJson,
+    );
+
+    for (field, replacement, expected) in [
+        (
+            "schema_version",
+            Value::from(2),
+            RadrootsPhase1PublicationArtifactError::UnsupportedSchemaVersion {
+                expected: 1,
+                actual: 2,
+            },
+        ),
+        (
+            "semantic_variant",
+            Value::from("update"),
+            RadrootsPhase1PublicationArtifactError::AuthoredOperationMismatch,
+        ),
+        (
+            "authored_operation_id",
+            Value::from("social.update.build_authored_draft"),
+            RadrootsPhase1PublicationArtifactError::AuthoredOperationMismatch,
+        ),
+        (
+            "event_contract_id",
+            Value::from("radroots.social.update.v1"),
+            RadrootsPhase1PublicationArtifactError::EventContractMismatch,
+        ),
+        (
+            "expected_author",
+            Value::from("not-a-key"),
+            RadrootsPhase1PublicationArtifactError::InvalidExpectedAuthor,
+        ),
+        (
+            "artifact_digest",
+            Value::from("00".repeat(32)),
+            RadrootsPhase1PublicationArtifactError::DigestMismatch,
+        ),
+    ] {
+        let mut value: Value = serde_json::from_slice(&canonical).unwrap();
+        value[field] = replacement;
+        assert_error(&serde_json::to_vec(&value).unwrap(), expected);
+    }
+
+    let mut value: Value = serde_json::from_slice(&canonical).unwrap();
+    value["draft"]["content"] = Value::from("changed");
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::ExpectedEventIdMismatch,
+    );
+
+    let mut value: Value = serde_json::from_slice(&canonical).unwrap();
+    value["expected_event_id"] = Value::from("00".repeat(32));
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::ExpectedEventIdMismatch,
+    );
+
+    let mut value: Value = serde_json::from_slice(&canonical).unwrap();
+    value["unknown"] = Value::Bool(true);
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::InvalidJson,
+    );
+}
+
+#[test]
+fn publication_artifact_envelope_uses_the_exact_contract_field_order() {
+    let canonical = String::from_utf8(all_artifacts()[0].to_canonical_json()).unwrap();
+    let fields = [
+        "\"schema_version\"",
+        "\"semantic_variant\"",
+        "\"authored_operation_id\"",
+        "\"event_contract_id\"",
+        "\"expected_author\"",
+        "\"draft\"",
+        "\"expected_event_id\"",
+        "\"media_references\"",
+        "\"artifact_digest\"",
+    ];
+    let positions = fields.map(|field| {
+        canonical
+            .find(field)
+            .unwrap_or_else(|| panic!("missing {field}"))
+    });
+    assert!(positions.windows(2).all(|pair| pair[0] < pair[1]));
+
+    let draft_start = canonical.find("\"draft\":{").unwrap();
+    let draft_end = canonical[draft_start..]
+        .find("},\"expected_event_id\"")
+        .map(|offset| draft_start + offset)
+        .unwrap();
+    let draft = &canonical[draft_start..draft_end];
+    let draft_positions = ["\"created_at\"", "\"kind\"", "\"tags\"", "\"content\""].map(|field| {
+        draft
+            .find(field)
+            .unwrap_or_else(|| panic!("missing {field}"))
+    });
+    assert!(draft_positions.windows(2).all(|pair| pair[0] < pair[1]));
+    let media = &canonical[positions[7]..positions[8]];
+    let media_positions = ["\"url\"", "\"sha256\"", "\"size\"", "\"media_type\""].map(|field| {
+        media
+            .find(field)
+            .unwrap_or_else(|| panic!("missing {field}"))
+    });
+    assert!(media_positions.windows(2).all(|pair| pair[0] < pair[1]));
+    let value: Value = serde_json::from_str(&canonical).unwrap();
+    assert!(value["expected_event_id"].is_string());
+}
+
+#[test]
+fn publication_artifact_reload_rejects_media_order_and_commitment_tamper() {
+    let artifact = &all_artifacts()[0];
+    let mut value: Value = serde_json::from_slice(&artifact.to_canonical_json()).unwrap();
+    value["media_references"].as_array_mut().unwrap().reverse();
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::NonCanonicalMediaInventory,
+    );
+
+    let mut value: Value = serde_json::from_slice(&artifact.to_canonical_json()).unwrap();
+    value["media_references"][0]["size"] = Value::from(999);
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::DigestMismatch,
+    );
+
+    let photo = &all_artifacts()[2];
+    let mut value: Value = serde_json::from_slice(&photo.to_canonical_json()).unwrap();
+    value["media_references"][0]["size"] = Value::from(999);
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::MediaInventoryMismatch,
+    );
+}
+
+#[test]
+fn publication_artifact_decode_is_bounded_before_json_parsing() {
+    let exact = vec![b' '; RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES];
+    assert_eq!(
+        RadrootsPhase1PublicationArtifact::from_canonical_json(&exact).unwrap_err(),
+        RadrootsPhase1PublicationArtifactError::InvalidJson
+    );
+
+    let bytes = vec![b' '; RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES + 1];
+    assert_eq!(
+        RadrootsPhase1PublicationArtifact::from_canonical_json(&bytes).unwrap_err(),
+        RadrootsPhase1PublicationArtifactError::ArtifactTooLarge {
+            max: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES,
+            actual: bytes.len(),
+        }
+    );
+}
+
+#[test]
+fn publication_artifact_media_count_accepts_exact_limit_and_rejects_one_over() {
+    let artifact = &all_artifacts()[1];
+    let mut value: Value = serde_json::from_slice(&artifact.to_canonical_json()).unwrap();
+    let sha256 = "11".repeat(32);
+    let references = (0..RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT)
+        .map(|index| {
+            serde_json::json!({
+                "url": format!("https://media-{index:04}.example/{sha256}.png"),
+                "sha256": sha256.clone(),
+                "size": 1,
+                "media_type": "image/png"
+            })
+        })
+        .collect::<Vec<_>>();
+    value["media_references"] = Value::Array(references.clone());
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::InvalidPostProfile,
+    );
+
+    let mut one_over = references;
+    one_over.push(serde_json::json!({
+        "url": format!("https://media-4096.example/{sha256}.png"),
+        "sha256": sha256,
+        "size": 1,
+        "media_type": "image/png"
+    }));
+    value["media_references"] = Value::Array(one_over);
+    assert_error(
+        &serde_json::to_vec(&value).unwrap(),
+        RadrootsPhase1PublicationArtifactError::TooManyMediaReferences {
+            max: RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT,
+            actual: RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT + 1,
+        },
+    );
+}
+
+#[test]
+fn publication_artifact_reload_requires_extensions_for_primary_media() {
+    let artifacts = all_artifacts();
+    for (index, host) in [
+        (0, "media.example"),
+        (2, "media.example"),
+        (4, "events.example"),
+        (6, "food.example"),
+    ] {
+        let mut value: Value =
+            serde_json::from_slice(&artifacts[index].to_canonical_json()).unwrap();
+        let reference = value["media_references"]
+            .as_array_mut()
+            .unwrap()
+            .iter_mut()
+            .find(|reference| reference["url"].as_str().unwrap().contains(host))
+            .unwrap();
+        let original = reference["url"].as_str().unwrap().to_string();
+        let extension_start = original.rfind('.').unwrap();
+        let extensionless = original[..extension_start].to_string();
+        reference["url"] = Value::from(extensionless.clone());
+        replace_json_string(&mut value["draft"], &original, &extensionless);
+        rebuild_expected_event_id(&mut value);
+        assert_error(
+            &serde_json::to_vec(&value).unwrap(),
+            RadrootsPhase1PublicationArtifactError::InvalidMediaReference,
+        );
+    }
+}
+
+#[test]
+fn publication_artifact_reload_accepts_extensionless_post_fallback() {
+    let image = authored_image(
+        b"extensionless-fallback",
+        "media.example",
+        "webp",
+        "image/webp",
+    );
+    let hash = image.descriptor().sha256();
+    let fallback = RadrootsBlossomBlobUrl::parse(&format!("https://backup.example/{hash}"))
+        .unwrap()
+        .approve()
+        .unwrap();
+    let post_image = RadrootsAuthoredPostImage::new(
+        image,
+        RadrootsPostImageDimensions::new(1200, 900).unwrap(),
+        "Fresh strawberries",
+    )
+    .unwrap()
+    .try_with_fallback(fallback)
+    .unwrap();
+    let url = post_image.url().to_string();
+    let ask =
+        RadrootsAuthoredAsk::new(format!("Available this week? {url}"), vec![post_image]).unwrap();
+    let artifact = RadrootsPhase1PublicationArtifact::from_ask(&ask, CREATED_AT, AUTHOR).unwrap();
+    assert_eq!(
+        RadrootsPhase1PublicationArtifact::from_canonical_json(&artifact.to_canonical_json())
+            .unwrap(),
+        artifact
+    );
+}
+
+fn assert_error(bytes: &[u8], expected: RadrootsPhase1PublicationArtifactError) {
+    assert_eq!(
+        RadrootsPhase1PublicationArtifact::from_canonical_json(bytes).unwrap_err(),
+        expected
+    );
+}
+
+fn assert_every_cross_variant_is_rejected(
+    artifacts: &[RadrootsPhase1PublicationArtifact],
+    expected_error: &str,
+    case_id: &str,
+) {
+    let variants = [
+        "profile",
+        "update",
+        "photo_update",
+        "ask",
+        "event_date",
+        "event_time",
+        "food_availability",
+    ];
+    let mut executed = 0usize;
+    for artifact in artifacts {
+        for target in variants {
+            if target == artifact.semantic_variant().as_str() {
+                continue;
+            }
+            let mut value: Value = serde_json::from_slice(&artifact.to_canonical_json()).unwrap();
+            value["semantic_variant"] = Value::from(target);
+            let error = RadrootsPhase1PublicationArtifact::from_canonical_json(
+                &serde_json::to_vec(&value).unwrap(),
+            )
+            .unwrap_err();
+            assert_eq!(error.code(), expected_error, "{case_id}: {target}");
+            executed += 1;
+        }
+    }
+    assert_eq!(executed, 42, "{case_id}");
+}
+
+fn artifact_fixture<'a>(
+    artifacts: &'a [RadrootsPhase1PublicationArtifact],
+    fixture: &str,
+) -> &'a RadrootsPhase1PublicationArtifact {
+    let index = match fixture {
+        "profile" => 0,
+        "update" => 1,
+        "photo_update" => 2,
+        "ask" => 3,
+        "event_date" => 4,
+        "event_time" => 5,
+        "food_availability" => 6,
+        other => panic!("unknown publication fixture {other}"),
+    };
+    &artifacts[index]
+}
+
+fn mutate_artifact(canonical: &[u8], mutation: &str) -> Vec<u8> {
+    match mutation {
+        "leading_whitespace" => {
+            let mut bytes = vec![b' '];
+            bytes.extend_from_slice(canonical);
+            return bytes;
+        }
+        "artifact_exact_byte_limit" => {
+            return vec![b' '; RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES];
+        }
+        "artifact_one_over_byte_limit" => {
+            return vec![b' '; RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES + 1];
+        }
+        "duplicate_expected_event_id" => {
+            return duplicate_expected_event_id(canonical);
+        }
+        _ => {}
+    }
+    let mut value: Value = serde_json::from_slice(canonical).unwrap();
+    match mutation {
+        "unknown_field" => value["unknown"] = Value::Bool(true),
+        "unknown_draft_field" => value["draft"]["unknown"] = Value::Bool(true),
+        "nested_expected_event_id" => {
+            value["draft"]["expected_event_id"] = value["expected_event_id"].clone();
+        }
+        "missing_expected_event_id" => {
+            value.as_object_mut().unwrap().remove("expected_event_id");
+        }
+        "malformed_expected_event_id" => {
+            value["expected_event_id"] = Value::from("not-an-event-id");
+        }
+        "uppercase_expected_event_id" => {
+            value["expected_event_id"] = Value::from(
+                value["expected_event_id"]
+                    .as_str()
+                    .unwrap()
+                    .to_ascii_uppercase(),
+            );
+        }
+        "unknown_media_field" => value["media_references"][0]["unknown"] = Value::Bool(true),
+        "json_field_order" => {}
+        "schema_version" => value["schema_version"] = Value::from(2),
+        "operation_id" => {
+            value["authored_operation_id"] = Value::from("social.update.build_authored_draft");
+        }
+        "contract_id" => {
+            value["event_contract_id"] = Value::from("radroots.social.update.v1");
+        }
+        "kind" => value["draft"]["kind"] = Value::from(1),
+        "author" => value["expected_author"] = Value::from("not-a-key"),
+        "created_at" => value["draft"]["created_at"] = Value::from(CREATED_AT + 1),
+        "draft_tags" => value["draft"]["tags"] = serde_json::json!([["x"]]),
+        "draft_content" => value["draft"]["content"] = Value::from("changed"),
+        "noncanonical_nip05" => {
+            let content = value["draft"]["content"]
+                .as_str()
+                .unwrap()
+                .replace("farm@example.com", "farm@EXAMPLE.COM");
+            assert!(content.contains("farm@EXAMPLE.COM"));
+            value["draft"]["content"] = Value::from(content);
+            rebuild_expected_event_id(&mut value);
+        }
+        "empty_ask_content" => {
+            value["draft"]["content"] = Value::from(" \t");
+            rebuild_expected_event_id(&mut value);
+        }
+        "expected_event_id" => {
+            value["expected_event_id"] = Value::from("00".repeat(32));
+        }
+        "digest" => value["artifact_digest"] = Value::from("00".repeat(32)),
+        "media_order" => value["media_references"].as_array_mut().unwrap().reverse(),
+        "media_size" => value["media_references"][0]["size"] = Value::from(999),
+        "media_url" => {
+            let url = value["media_references"][0]["url"].as_str().unwrap();
+            value["media_references"][0]["url"] =
+                Value::from(url.replacen("https://media.example", "https://alternate.example", 1));
+        }
+        "media_url_casing" => {
+            let url = value["media_references"][0]["url"].as_str().unwrap();
+            value["media_references"][0]["url"] =
+                Value::from(url.replacen("https://", "HTTPS://", 1));
+        }
+        "media_hash" => value["media_references"][0]["sha256"] = Value::from("00".repeat(32)),
+        "media_type" => value["media_references"][0]["media_type"] = Value::from("image/jpeg"),
+        other => panic!("unknown publication mutation {other}"),
+    }
+    serde_json::to_vec(&value).unwrap()
+}
+
+fn duplicate_expected_event_id(canonical: &[u8]) -> Vec<u8> {
+    let value: Value = serde_json::from_slice(canonical).unwrap();
+    let event_id = value["expected_event_id"].as_str().unwrap();
+    let field = format!("\"expected_event_id\":\"{event_id}\"");
+    let duplicate = format!("{field},{field}");
+    let canonical = core::str::from_utf8(canonical).unwrap();
+    let mutated = canonical.replacen(&field, &duplicate, 1);
+    assert_ne!(mutated, canonical);
+    mutated.into_bytes()
+}
+
+fn rebuild_expected_event_id(value: &mut Value) {
+    let author = value["expected_author"].as_str().unwrap();
+    let created_at = value["draft"]["created_at"].as_u64().unwrap();
+    let kind = value["draft"]["kind"].as_u64().unwrap() as u32;
+    let tags: Vec<Vec<String>> = serde_json::from_value(value["draft"]["tags"].clone()).unwrap();
+    let content = value["draft"]["content"].as_str().unwrap();
+    value["expected_event_id"] = Value::from(
+        compute_canonical_nip01_event_id(author, created_at, kind, &tags, content)
+            .unwrap()
+            .to_string(),
+    );
+}
+
+fn replace_json_string(value: &mut Value, from: &str, to: &str) {
+    match value {
+        Value::String(string) => *string = string.replace(from, to),
+        Value::Array(values) => {
+            for value in values {
+                replace_json_string(value, from, to);
+            }
+        }
+        Value::Object(values) => {
+            for value in values.values_mut() {
+                replace_json_string(value, from, to);
+            }
+        }
+        _ => {}
+    }
+}
+
+fn all_artifacts() -> Vec<RadrootsPhase1PublicationArtifact> {
+    let picture = authored_image(b"profile-picture", "media.example", "png", "image/png");
+    let banner = authored_image(b"profile-banner", "media.example", "webp", "image/webp");
+    let profile = RadrootsAuthoredProfile::new("victoria-farm")
+        .unwrap()
+        .with_display_name("Victoria Farm")
+        .with_about("Seasonal produce from the Saanich Peninsula")
+        .with_picture(picture)
+        .with_banner(banner)
+        .with_nip05(RadrootsNip05Identifier::parse("farm@example.com").unwrap())
+        .with_bot(false);
+
+    let post_image = authored_post_image(b"ask-and-photo");
+    let post_url = post_image.url().to_string();
+    let photo = RadrootsAuthoredPhotoUpdate::new(
+        format!("Strawberries at the farm stand {post_url}"),
+        vec![post_image.clone()],
+    )
+    .unwrap();
+    let ask = RadrootsAuthoredAsk::new(
+        format!("When will strawberries be ready? {post_url}"),
+        vec![post_image],
+    )
+    .unwrap();
+
+    let event_image = authored_image(b"farm-event", "events.example", "jpeg", "image/jpeg");
+    let date = RadrootsAuthoredCalendarDateEvent::new(
+        "farmers-market-2026",
+        "Moss Street Farmers Market",
+        RadrootsCalendarDate::parse("2026-07-25").unwrap(),
+    )
+    .unwrap()
+    .with_end(RadrootsCalendarDate::parse("2026-07-26").unwrap())
+    .unwrap()
+    .with_description("Saturday market in Victoria")
+    .unwrap()
+    .with_locations(vec!["Victoria, BC".to_string()])
+    .unwrap()
+    .with_image(event_image.clone())
+    .unwrap();
+    let time = RadrootsAuthoredCalendarTimeEvent::new(
+        "farm-tour-2026",
+        "Saanich Farm Tour",
+        1_785_003_600,
+    )
+    .unwrap()
+    .with_end(1_785_007_200)
+    .unwrap()
+    .with_start_tzid("America/Vancouver")
+    .unwrap()
+    .with_description("A one-hour farm tour")
+    .unwrap()
+    .with_image(event_image)
+    .unwrap();
+
+    vec![
+        RadrootsPhase1PublicationArtifact::from_profile(&profile, CREATED_AT, AUTHOR).unwrap(),
+        RadrootsPhase1PublicationArtifact::from_update(
+            &RadrootsAuthoredUpdate::new("Carrots harvested today").unwrap(),
+            CREATED_AT,
+            AUTHOR,
+        )
+        .unwrap(),
+        RadrootsPhase1PublicationArtifact::from_photo_update(&photo, CREATED_AT, AUTHOR).unwrap(),
+        RadrootsPhase1PublicationArtifact::from_ask(&ask, CREATED_AT, AUTHOR).unwrap(),
+        RadrootsPhase1PublicationArtifact::from_calendar_date_event(&date, CREATED_AT, AUTHOR)
+            .unwrap(),
+        RadrootsPhase1PublicationArtifact::from_calendar_time_event(&time, CREATED_AT, AUTHOR)
+            .unwrap(),
+        RadrootsPhase1PublicationArtifact::from_food_availability(
+            &food_details(),
+            CREATED_AT,
+            AUTHOR,
+        )
+        .unwrap(),
+    ]
+}
+
+fn authored_post_image(bytes: &[u8]) -> RadrootsAuthoredPostImage {
+    let image = authored_image(bytes, "media.example", "webp", "image/webp");
+    let hash = image.descriptor().sha256();
+    let fallback = RadrootsBlossomBlobUrl::parse(&format!("https://backup.example/{hash}.webp"))
+        .unwrap()
+        .approve()
+        .unwrap();
+    RadrootsAuthoredPostImage::new(
+        image,
+        RadrootsPostImageDimensions::new(1200, 900).unwrap(),
+        "Fresh strawberries",
+    )
+    .unwrap()
+    .try_with_fallback(fallback)
+    .unwrap()
+}
+
+fn food_details() -> RadrootsFoodAvailabilityDetails {
+    let image = RadrootsFoodAvailabilityImage::new(
+        authored_image(b"nantes-carrots", "food.example", "png", "image/png"),
+        RadrootsFoodImageDimensions::new(1200, 800).unwrap(),
+    );
+    RadrootsFoodAvailabilityDetails::new(RadrootsFoodAvailabilityDetailsParts {
+        content: RadrootsFoodContent::new("Fresh Nantes carrots available this week.").unwrap(),
+        identifier: RadrootsFoodIdentifier::parse("nantes-carrots").unwrap(),
+        title: RadrootsFoodText::new("Nantes Carrots").unwrap(),
+        summary: RadrootsFoodText::new("Fresh bunches").unwrap(),
+        published_at: RadrootsFoodPublishedAt::new(CREATED_AT - 60).unwrap(),
+        location: RadrootsFoodText::new("Central Saanich, BC").unwrap(),
+        price: RadrootsFoodPrice::new(
+            "3",
+            RadrootsFoodCurrency::parse("CAD").unwrap(),
+            RadrootsFoodUnit::Pound,
+        )
+        .unwrap(),
+        quantity: Some(RadrootsFoodQuantity::new("24", RadrootsFoodUnit::Pound).unwrap()),
+        status: RadrootsFoodAvailabilityStatus::Active,
+        images: vec![image],
+    })
+    .unwrap()
+}
+
+fn authored_image(
+    bytes: &[u8],
+    host: &str,
+    extension: &str,
+    media_type: &str,
+) -> RadrootsAuthoredImage {
+    RadrootsAuthoredImage::try_from(verified_descriptor(bytes, host, extension, media_type))
+        .unwrap()
+}
+
+fn verified_descriptor(
+    bytes: &[u8],
+    host: &str,
+    extension: &str,
+    media_type: &str,
+) -> RadrootsBlossomByteVerifiedDescriptor {
+    let sha256 = RadrootsBlossomSha256::digest(bytes);
+    let media_type = RadrootsBlossomMediaType::parse(media_type).unwrap();
+    RadrootsBlossomBlobDescriptor::new(
+        RadrootsBlossomBlobUrl::parse(&format!("https://{host}/{sha256}.{extension}")).unwrap(),
+        sha256,
+        bytes.len() as u64,
+        media_type.clone(),
+        CREATED_AT,
+    )
+    .unwrap()
+    .approve_reference()
+    .unwrap()
+    .verify_bytes(bytes, &media_type)
+    .unwrap()
+}
diff --git a/tools/xtask/src/contract.rs b/tools/xtask/src/contract.rs
@@ -6,6 +6,10 @@ mod comment_authority;
 mod deletion_authority;
 mod food_availability_projection;
 mod nip09_reconciliation;
+mod phase1_publication_artifact;
+// The raw-source implementation remains compiled for its historical unit tests, while the
+// publication successor validates its immutable artifacts instead of rebuilding current source.
+#[allow(dead_code)]
 mod raw_source_rebuild;
 mod registry_v7;
 mod source_maintenance;
@@ -16,8 +20,8 @@ pub(crate) use food_availability_projection::{
 pub(crate) use nip09_reconciliation::{
     validate_nip09_reconciliation_manifest, write_nip09_reconciliation_manifest,
 };
-pub(crate) use raw_source_rebuild::{
-    validate_raw_source_rebuild_manifest, write_raw_source_rebuild_manifest,
+pub(crate) use phase1_publication_artifact::{
+    validate_phase1_publication_artifact_manifest, write_phase1_publication_artifact_manifest,
 };
 pub(crate) use registry_v7::{
     validate_event_contract_registry_v7_inventory, write_event_contract_registry_v7_inventory,
@@ -54,9 +58,19 @@ pub(crate) fn validate_artifact_contracts(workspace_root: &Path) -> Result<(), S
     validate_food_availability_projection_manifest(workspace_root)?;
     validate_source_maintenance_manifest(workspace_root)?;
     validate_raw_source_rebuild_manifest(workspace_root)?;
+    validate_phase1_publication_artifact_manifest(workspace_root)?;
     validate_knowledge_contract_manifest(workspace_root)
 }
 
+pub(crate) fn validate_raw_source_rebuild_manifest(workspace_root: &Path) -> Result<(), String> {
+    phase1_publication_artifact::validate_immutable_raw_source_rebuild_predecessor(workspace_root)
+}
+
+pub(crate) fn write_raw_source_rebuild_manifest(workspace_root: &Path) -> Result<(), String> {
+    phase1_publication_artifact::validate_immutable_raw_source_rebuild_predecessor(workspace_root)?;
+    Err("raw-source rebuild is an immutable predecessor and cannot be rewritten; write the active publication successor instead".to_owned())
+}
+
 const ROOT_RELEASE_POLICY_RELATIVE: &str =
     "foundation/contracts/release_runtime/mounted_rust_crates/publish-policy.toml";
 const CONFORMANCE_ROOT_RELATIVE: &str = "contracts/conformance";
@@ -94,7 +108,7 @@ const REPLICA_CONTRACT_NAME: &str = "radroots_replica_contract";
 const REPLICA_TRANSFER_CONSTANT: &str = "RADROOTS_REPLICA_TRANSFER_VERSION";
 const REPLICA_TRANSFER_VERSION: u32 = 2;
 const VENDORED_WORKSPACE_MEMBER_RELATIVE: &str = "crates/libsqlite3_sys_3_53_3";
-const CONFORMANCE_VECTOR_MIRRORS: [(&str, &str); 23] = [
+const CONFORMANCE_VECTOR_MIRRORS: [(&str, &str); 24] = [
     (
         "contracts/conformance/vectors/blossom/bud11_claims.v1.json",
         "crates/blossom/tests/fixtures/bud11_claims.v1.json",
@@ -180,6 +194,10 @@ const CONFORMANCE_VECTOR_MIRRORS: [(&str, &str); 23] = [
         "crates/event_codec/tests/fixtures/post_verified_profiles.v1.json",
     ),
     (
+        "contracts/conformance/vectors/publication/phase1_artifact.v1.json",
+        "crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json",
+    ),
+    (
         "contracts/conformance/vectors/trade/parse_classified_listing_address.v1.json",
         "crates/trade/tests/fixtures/parse_classified_listing_address.v1.json",
     ),
diff --git a/tools/xtask/src/contract/nip09_reconciliation.rs b/tools/xtask/src/contract/nip09_reconciliation.rs
@@ -5312,7 +5312,12 @@ fn validate_raw_crate_attributes(relative: &str, source: &str) -> Result<(), Str
             "#![cfg_attr(all(not(feature=\"std\"),not(test)),no_std)]",
             "#![forbid(unsafe_code)]",
         ],
-        "crates/event_codec/src/lib.rs" | "crates/blossom/src/lib.rs" => &[
+        "crates/event_codec/src/lib.rs" => &[
+            "#![cfg_attr(all(not(feature=\"std\"),not(test)),no_std)]",
+            "#![cfg_attr(coverage_nightly,feature(coverage_attribute))]",
+            "#![forbid(unsafe_code)]",
+        ],
+        "crates/blossom/src/lib.rs" => &[
             "#![cfg_attr(not(feature=\"std\"),no_std)]",
             "#![cfg_attr(coverage_nightly,feature(coverage_attribute))]",
             "#![forbid(unsafe_code)]",
@@ -17323,6 +17328,37 @@ mod tests {
         let predecessor =
             toml::to_string_pretty(&manifest).expect("serialize predecessor Cargo manifest");
         fs::write(manifest_path, predecessor).expect("restore predecessor compiler manifest");
+
+        let codec_manifest_path = workspace_root.join(EVENT_CODEC_CARGO_MANIFEST_RELATIVE);
+        let codec_source =
+            fs::read_to_string(&codec_manifest_path).expect("event-codec Cargo manifest");
+        let mut codec_manifest: toml::Value =
+            toml::from_str(&codec_source).expect("parse event-codec Cargo manifest");
+        let serde_json_features = codec_manifest
+            .get_mut("features")
+            .and_then(toml::Value::as_table_mut)
+            .and_then(|features| features.get_mut("serde_json"))
+            .and_then(toml::Value::as_array_mut)
+            .expect("event-codec serde_json feature");
+        assert_eq!(
+            serde_json_features
+                .iter()
+                .map(toml::Value::as_str)
+                .collect::<Vec<_>>(),
+            [
+                Some("serde"),
+                Some("dep:hex"),
+                Some("dep:serde_json"),
+                Some("dep:sha2"),
+            ],
+            "publication successor feature edges must retain their exact semantic shape"
+        );
+        serde_json_features
+            .retain(|feature| !matches!(feature.as_str(), Some("dep:hex" | "dep:sha2")));
+        let codec_predecessor = toml::to_string_pretty(&codec_manifest)
+            .expect("serialize predecessor event-codec Cargo manifest");
+        fs::write(codec_manifest_path, codec_predecessor)
+            .expect("restore predecessor event-codec compiler manifest");
     }
 
     fn strip_outer_try(statement: &mut syn::Stmt) {
diff --git a/tools/xtask/src/contract/phase1_publication_artifact.rs b/tools/xtask/src/contract/phase1_publication_artifact.rs
@@ -0,0 +1,1819 @@
+use super::artifact_bundle::{
+    GeneratedArtifact, read_regular_file, with_artifact_bundle_transaction,
+};
+use radroots_event_codec::wire::publication::{
+    RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES,
+    RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION,
+    RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT,
+    RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES,
+};
+use serde::{Deserialize, Serialize};
+use serde_json::{Value, json};
+use sha2::{Digest, Sha256};
+use std::collections::{BTreeMap, BTreeSet};
+use std::fs;
+use std::path::Path;
+
+const SCHEMA_VERSION: u32 = 1;
+const CONTRACT_ID: &str = "radroots_event_codec.phase1_publication_artifact_v1";
+const AUTHORITY_ID: &str = "phase1_publication_artifact_v1";
+const HASH_ALGORITHM: &str = "sha256_bytes_v1";
+const WRITE_COMMAND: &str = "cargo xtask contract phase1-publication-artifact-manifest --write";
+
+const MANIFEST_RELATIVE: &str =
+    "crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.json";
+const MANIFEST_SCHEMA_RELATIVE: &str =
+    "crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json";
+const MANIFEST_SHA256_RELATIVE: &str =
+    "crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.sha256";
+const VECTOR_RELATIVE: &str = "contracts/conformance/vectors/publication/phase1_artifact.v1.json";
+const VECTOR_MIRROR_RELATIVE: &str =
+    "crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json";
+const VECTOR_EXECUTOR_RELATIVE: &str = "crates/event_codec/tests/publication_artifact.rs";
+const VECTOR_EXECUTOR_TEST: &str = "publication_artifact_conformance_vector_executes_every_case";
+const OPERATIONS_RELATIVE: &str = "contracts/operations.toml";
+const RELEASE_RELATIVE: &str = "contracts/releases/1.0.0-alpha.1.toml";
+const CHANGELOG_RELATIVE: &str = "CHANGELOG.md";
+const RELEASE_CHANGE_ID: &str = "phase1-publication-artifact";
+const CHANGELOG_MARKER: &str = "<!-- release-change: phase1-publication-artifact -->";
+const REGISTRY_RELATIVE: &str = "contracts/event_store/event_contract_registry_v7.inventory.json";
+const REGISTRY_SIDECAR_RELATIVE: &str =
+    "contracts/event_store/event_contract_registry_v7.inventory.sha256";
+
+const RAW_MANIFEST_RELATIVE: &str =
+    "crates/event_store/contracts/raw_source_rebuild_v1.manifest.json";
+const RAW_MANIFEST_SCHEMA_RELATIVE: &str =
+    "crates/event_store/contracts/raw_source_rebuild_v1.manifest.schema.json";
+const RAW_MANIFEST_SHA256_RELATIVE: &str =
+    "crates/event_store/contracts/raw_source_rebuild_v1.manifest.sha256";
+const RAW_GENERATED_DESCRIPTOR_RELATIVE: &str =
+    "crates/event_store/src/generated/raw_source_rebuild_manifest.rs";
+const RAW_VECTOR_RELATIVE: &str =
+    "contracts/conformance/vectors/event_store/raw_source_rebuild.v1.json";
+const RAW_VECTOR_MIRROR_RELATIVE: &str =
+    "crates/event_store/tests/fixtures/raw_source_rebuild.v1.json";
+const RAW_VECTOR_EXECUTOR_RELATIVE: &str =
+    "crates/event_store/tests/raw_source_rebuild_v1_result_vector.rs";
+
+const GENERATED_ARTIFACT_PATHS: &[&str] = &[
+    MANIFEST_RELATIVE,
+    MANIFEST_SCHEMA_RELATIVE,
+    MANIFEST_SHA256_RELATIVE,
+    VECTOR_MIRROR_RELATIVE,
+];
+
+const PUBLIC_SOURCE_ROOTS: &[&str] = &[
+    "crates/blossom/src",
+    "crates/core/src",
+    "crates/event/src",
+    "crates/event_codec/src",
+    "crates/transport/src",
+];
+
+const EXPLICIT_SOURCE_SPECS: &[(&str, &str)] = &[
+    ("cargo_config_authority", ".cargo/config.toml"),
+    ("workspace_manifest_authority", "Cargo.toml"),
+    ("workspace_lockfile_authority", "Cargo.lock"),
+    ("rust_toolchain_authority", "rust-toolchain.toml"),
+    ("blossom_manifest_authority", "crates/blossom/Cargo.toml"),
+    ("core_manifest_authority", "crates/core/Cargo.toml"),
+    ("event_manifest_authority", "crates/event/Cargo.toml"),
+    (
+        "event_codec_manifest_authority",
+        "crates/event_codec/Cargo.toml",
+    ),
+    ("event_codec_documentation", "crates/event_codec/README"),
+    (
+        "event_store_manifest_authority",
+        "crates/event_store/Cargo.toml",
+    ),
+    (
+        "transport_manifest_authority",
+        "crates/transport/Cargo.toml",
+    ),
+    ("xtask_manifest_authority", "tools/xtask/Cargo.toml"),
+    ("publication_vector_executor", VECTOR_EXECUTOR_RELATIVE),
+    ("operations_authority", OPERATIONS_RELATIVE),
+    ("release_authority", RELEASE_RELATIVE),
+    ("release_notes", CHANGELOG_RELATIVE),
+    ("contract_command_authority", "tools/xtask/src/contract.rs"),
+    ("contract_dispatch_authority", "tools/xtask/src/main.rs"),
+    (
+        "superseded_nip09_contract_governance",
+        "tools/xtask/src/contract/nip09_reconciliation.rs",
+    ),
+    (
+        "superseded_raw_rebuild_contract_governance",
+        "tools/xtask/src/contract/raw_source_rebuild.rs",
+    ),
+    (
+        "publication_contract_governance",
+        "tools/xtask/src/contract/phase1_publication_artifact.rs",
+    ),
+];
+
+const RAW_PREDECESSOR_SUPERSEDED_PATHS: &[&str] = &[
+    CHANGELOG_RELATIVE,
+    RELEASE_RELATIVE,
+    "tools/xtask/src/contract.rs",
+    "tools/xtask/src/main.rs",
+    "tools/xtask/src/contract/nip09_reconciliation.rs",
+    "tools/xtask/src/contract/raw_source_rebuild.rs",
+];
+
+const PUBLIC_TYPES: &[&str] = &[
+    "RadrootsPhase1PublicationEventVariant",
+    "RadrootsPhase1PublicationSemanticVariant",
+    "RadrootsPhase1PublicationDraft",
+    "RadrootsPhase1PublicationMediaReference",
+    "RadrootsPhase1PublicationArtifactDigest",
+    "RadrootsPhase1PublicationArtifact",
+    "RadrootsPhase1PublicationArtifactError",
+];
+
+const VALID_VECTOR_CASES: &[(&str, &str)] = &[
+    (
+        "profile_round_trip",
+        "publication_artifact.build_profile.valid",
+    ),
+    (
+        "update_round_trip",
+        "publication_artifact.build_update.valid",
+    ),
+    (
+        "photo_update_round_trip",
+        "publication_artifact.build_photo_update.valid",
+    ),
+    (
+        "ask_round_trip_with_fallback",
+        "publication_artifact.build_ask.valid",
+    ),
+    (
+        "event_date_round_trip",
+        "publication_artifact.build_calendar_date_event.valid",
+    ),
+    (
+        "event_time_round_trip",
+        "publication_artifact.build_calendar_time_event.valid",
+    ),
+    (
+        "food_availability_round_trip",
+        "publication_artifact.build_food_availability.valid",
+    ),
+    (
+        "canonical_json_serialization",
+        "publication_artifact.to_canonical_json.valid",
+    ),
+    (
+        "canonical_json_reload",
+        "publication_artifact.from_canonical_json.valid",
+    ),
+];
+
+const INVALID_VECTOR_KIND: &str = "publication_artifact.from_canonical_json.invalid";
+
+const REQUIRED_INVALID_VECTOR_IDS: &[&str] = &[
+    "leading_whitespace_is_noncanonical",
+    "artifact_exact_byte_limit_reaches_parser",
+    "artifact_one_byte_over_limit_is_rejected",
+    "unknown_field_is_rejected",
+    "unknown_draft_field_is_rejected",
+    "nested_expected_event_id_is_rejected",
+    "missing_expected_event_id_is_rejected",
+    "malformed_expected_event_id_is_rejected",
+    "uppercase_expected_event_id_is_rejected",
+    "duplicate_expected_event_id_is_rejected",
+    "unknown_media_field_is_rejected",
+    "json_field_order_is_noncanonical",
+    "unknown_version_is_rejected",
+    "cross_variant_is_rejected",
+    "operation_mismatch_is_rejected",
+    "contract_mismatch_is_rejected",
+    "kind_mismatch_is_rejected",
+    "author_mismatch_is_rejected",
+    "created_at_tamper_is_rejected",
+    "draft_tags_tamper_is_rejected",
+    "draft_content_tamper_is_rejected",
+    "noncanonical_nip05_is_rejected_after_id_rebuild",
+    "empty_ask_content_is_rejected_after_id_rebuild",
+    "expected_event_id_tamper_is_rejected",
+    "digest_tamper_is_rejected",
+    "media_order_is_rejected",
+    "profile_media_commitment_tamper_is_rejected",
+    "media_url_tamper_is_rejected",
+    "noncanonical_media_url_casing_is_rejected",
+    "media_hash_tamper_is_rejected",
+    "media_type_tamper_is_rejected",
+    "post_media_commitment_must_match_imeta",
+];
+
+const RAW_IMMUTABLE_ARTIFACTS: &[ImmutableArtifactSpec] = &[
+    ImmutableArtifactSpec::new(
+        RAW_MANIFEST_RELATIVE,
+        45_449,
+        "03253ce31dc31d465880a895d2685f5deb1274948e0a4eabe81a2f08f238c483",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_MANIFEST_SCHEMA_RELATIVE,
+        17_896,
+        "f9d210967e54b66f39c8bb965d97b2001a0ebc0927e7c2c14edb8e474bfda695",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_MANIFEST_SHA256_RELATIVE,
+        65,
+        "2b8bc07cd479be2281781660efd26fd7a8f480e5f3f62053aeccd2b5e6b2070c",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_GENERATED_DESCRIPTOR_RELATIVE,
+        50_735,
+        "3763fbee3ee45621afca990002b9298c791bf0396ebf7bccde0ae1bc9aecb7f2",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_VECTOR_RELATIVE,
+        26_833,
+        "c37a2bf3714f53ab04fae8c5c9dbe2ad4b3f5310efa51f46bd8b116660f1fe15",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_VECTOR_MIRROR_RELATIVE,
+        26_833,
+        "c37a2bf3714f53ab04fae8c5c9dbe2ad4b3f5310efa51f46bd8b116660f1fe15",
+    ),
+    ImmutableArtifactSpec::new(
+        RAW_VECTOR_EXECUTOR_RELATIVE,
+        25_542,
+        "51647259efdd0d99689ef1db0defb139c8d1f60f2ead69b793ddb2733a28e832",
+    ),
+];
+
+const GOVERNED_COMPILER_TABLES: &[(&str, &str, &str)] = &[
+    (
+        "crates/core/Cargo.toml",
+        "radroots_core",
+        "3eaa58e5c6a6e1ee857da1d519c65480a15b3432376cb14c4fa781870caef359",
+    ),
+    (
+        "crates/event/Cargo.toml",
+        "radroots_event",
+        "c6908858696c9b9df86eea1983acf251aa68242ccc24fe5c8ad89c10aafd3cb3",
+    ),
+    (
+        "crates/event_codec/Cargo.toml",
+        "radroots_event_codec",
+        "ee2e9c60570b1a266a6e813b758c1d556559eaf71acb16ddd8bef93591a26d4b",
+    ),
+    (
+        "crates/blossom/Cargo.toml",
+        "radroots_blossom",
+        "b91985be4f3da164b434a06ab816321c1cd27a44b0ca7f817881a5ff57ff168d",
+    ),
+    (
+        "crates/event_store/Cargo.toml",
+        "radroots_event_store",
+        "8afca70838e4d83a7b6409c91cef7184d805086d9fba342fd42ff2c4010db450",
+    ),
+    (
+        "crates/transport/Cargo.toml",
+        "radroots_transport",
+        "a1391f424322e4851baa881c787f6b824cbc5ff69834db44e4b96e76cb776c15",
+    ),
+];
+
+const CONSTRUCTORS: &[ConstructorSpec] = &[
+    ConstructorSpec {
+        semantic_variant: "profile",
+        serialized_semantic_variant: "profile",
+        event_variant: None,
+        strict_input: "RadrootsAuthoredProfile",
+        constructor: "from_profile",
+        publication_operation_id: "publication_artifact.build_profile",
+        authored_operation_id: "profile.build_authored_draft",
+        event_contract_id: "radroots.profile.metadata.v1",
+        kind: 0,
+    },
+    ConstructorSpec {
+        semantic_variant: "update",
+        serialized_semantic_variant: "update",
+        event_variant: None,
+        strict_input: "RadrootsAuthoredUpdate",
+        constructor: "from_update",
+        publication_operation_id: "publication_artifact.build_update",
+        authored_operation_id: "social.update.build_authored_draft",
+        event_contract_id: "radroots.social.update.v1",
+        kind: 1,
+    },
+    ConstructorSpec {
+        semantic_variant: "photo_update",
+        serialized_semantic_variant: "photo_update",
+        event_variant: None,
+        strict_input: "RadrootsAuthoredPhotoUpdate",
+        constructor: "from_photo_update",
+        publication_operation_id: "publication_artifact.build_photo_update",
+        authored_operation_id: "social.photo_update.build_authored_draft",
+        event_contract_id: "radroots.social.photo_update.v1",
+        kind: 1,
+    },
+    ConstructorSpec {
+        semantic_variant: "ask",
+        serialized_semantic_variant: "ask",
+        event_variant: None,
+        strict_input: "RadrootsAuthoredAsk",
+        constructor: "from_ask",
+        publication_operation_id: "publication_artifact.build_ask",
+        authored_operation_id: "social.ask.build_authored_draft",
+        event_contract_id: "radroots.social.ask.v1",
+        kind: 1,
+    },
+    ConstructorSpec {
+        semantic_variant: "event",
+        serialized_semantic_variant: "event_date",
+        event_variant: Some("date"),
+        strict_input: "RadrootsAuthoredCalendarDateEvent",
+        constructor: "from_calendar_date_event",
+        publication_operation_id: "publication_artifact.build_calendar_date_event",
+        authored_operation_id: "social.calendar_date_event.build_authored_draft",
+        event_contract_id: "radroots.calendar.date_event.v1",
+        kind: 31_922,
+    },
+    ConstructorSpec {
+        semantic_variant: "event",
+        serialized_semantic_variant: "event_time",
+        event_variant: Some("time"),
+        strict_input: "RadrootsAuthoredCalendarTimeEvent",
+        constructor: "from_calendar_time_event",
+        publication_operation_id: "publication_artifact.build_calendar_time_event",
+        authored_operation_id: "social.calendar_time_event.build_authored_draft",
+        event_contract_id: "radroots.calendar.time_event.v1",
+        kind: 31_923,
+    },
+    ConstructorSpec {
+        semantic_variant: "food_availability",
+        serialized_semantic_variant: "food_availability",
+        event_variant: None,
+        strict_input: "RadrootsFoodAvailabilityDetails",
+        constructor: "from_food_availability",
+        publication_operation_id: "publication_artifact.build_food_availability",
+        authored_operation_id: "food_availability.build_authored_draft",
+        event_contract_id: "radroots.food.availability.v1",
+        kind: 30_402,
+    },
+];
+
+#[derive(Clone, Copy)]
+struct ImmutableArtifactSpec {
+    relative: &'static str,
+    byte_length: usize,
+    sha256: &'static str,
+}
+
+impl ImmutableArtifactSpec {
+    const fn new(relative: &'static str, byte_length: usize, sha256: &'static str) -> Self {
+        Self {
+            relative,
+            byte_length,
+            sha256,
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+struct ConstructorSpec {
+    semantic_variant: &'static str,
+    serialized_semantic_variant: &'static str,
+    event_variant: Option<&'static str>,
+    strict_input: &'static str,
+    constructor: &'static str,
+    publication_operation_id: &'static str,
+    authored_operation_id: &'static str,
+    event_contract_id: &'static str,
+    kind: u32,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct PublicationManifest {
+    schema_version: u32,
+    contract_id: String,
+    authority_id: String,
+    manifest_schema: FileDescriptor,
+    predecessor: PredecessorDescriptor,
+    event_contract_registry: RegistryDescriptor,
+    artifact: ArtifactDescriptor,
+    operations: Vec<OperationDescriptor>,
+    predecessor_source_supersessions: Vec<String>,
+    source_files: Vec<SourceFileDescriptor>,
+    result_vector: ResultVectorDescriptor,
+    release: ReleaseDescriptor,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct FileDescriptor {
+    path: String,
+    byte_length: u64,
+    sha256: String,
+    hash_algorithm: String,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct SourceFileDescriptor {
+    role: String,
+    path: String,
+    byte_length: u64,
+    sha256: String,
+    hash_algorithm: String,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct PredecessorDescriptor {
+    contract_id: String,
+    manifest: FileDescriptor,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct RegistryDescriptor {
+    version: u32,
+    inventory: FileDescriptor,
+    sidecar: FileDescriptor,
+    evolution: String,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct ArtifactDescriptor {
+    schema_version: u32,
+    validator: String,
+    semantic_roles: Vec<String>,
+    serialized_semantic_variants: Vec<String>,
+    event_subvariants: Vec<String>,
+    canonical_encoding: String,
+    artifact_max_bytes: u64,
+    signed_event_wire_max_bytes: u64,
+    media_reference_max_count: u64,
+    envelope_fields: Vec<String>,
+    draft_fields: Vec<String>,
+    media_reference_fields: Vec<String>,
+    media_reference_identity: String,
+    primary_media_url_requirement: String,
+    post_fallback_url_requirement: String,
+    digest_algorithm: String,
+    digest_domain: String,
+    digest_domain_terminator: String,
+    digest_preimage: String,
+    constructors: Vec<ConstructorDescriptor>,
+    denied_inputs: Vec<String>,
+    reload_capability: String,
+    threat_boundary: Vec<String>,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct ConstructorDescriptor {
+    semantic_variant: String,
+    serialized_semantic_variant: String,
+    event_variant: Option<String>,
+    strict_input: String,
+    constructor: String,
+    publication_operation_id: String,
+    authored_operation_id: String,
+    event_contract_id: String,
+    kind: u32,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct OperationDescriptor {
+    id: String,
+    strict_input: String,
+    output: String,
+    error_class: String,
+    signing: String,
+    transport: String,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct ResultVectorDescriptor {
+    canonical_path: String,
+    mirror_path: String,
+    byte_length: u64,
+    sha256: String,
+    hash_algorithm: String,
+    executor_path: String,
+    executor_test: String,
+    valid_case_ids: Vec<String>,
+    invalid_case_ids: Vec<String>,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(deny_unknown_fields)]
+struct ReleaseDescriptor {
+    record_path: String,
+    change_id: String,
+    changelog_path: String,
+    changelog_marker: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct VectorSuite {
+    suite: String,
+    contract_version: String,
+    vectors: Vec<VectorCase>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct VectorCase {
+    id: String,
+    kind: String,
+    input: Value,
+    expected: Value,
+}
+
+struct ValidatedResultVector {
+    valid_case_ids: Vec<String>,
+    invalid_case_ids: Vec<String>,
+    bytes: Vec<u8>,
+}
+
+pub(crate) fn write_phase1_publication_artifact_manifest(
+    workspace_root: &Path,
+) -> Result<(), String> {
+    with_artifact_bundle_transaction(workspace_root, |transaction| {
+        transaction.write(expected_artifacts(workspace_root)?)?;
+        validate_manifest_under_lock(workspace_root)
+    })
+}
+
+pub(crate) fn validate_phase1_publication_artifact_manifest(
+    workspace_root: &Path,
+) -> Result<(), String> {
+    with_artifact_bundle_transaction(workspace_root, |_| {
+        validate_manifest_under_lock(workspace_root)
+    })
+}
+
+pub(crate) fn validate_immutable_raw_source_rebuild_predecessor(
+    workspace_root: &Path,
+) -> Result<(), String> {
+    with_artifact_bundle_transaction(workspace_root, |_| {
+        validate_immutable_raw_predecessor_under_lock(workspace_root)
+    })
+}
+
+fn validate_manifest_under_lock(workspace_root: &Path) -> Result<(), String> {
+    validate_immutable_raw_predecessor_under_lock(workspace_root)?;
+    for artifact in expected_artifacts(workspace_root)? {
+        let actual = read_regular_file(workspace_root, artifact.relative)?;
+        if actual != artifact.contents {
+            return Err(format!(
+                "generated Phase 1 publication contract {} is stale; run {WRITE_COMMAND}",
+                artifact.relative
+            ));
+        }
+    }
+
+    let bytes = read_regular_file(workspace_root, MANIFEST_RELATIVE)?;
+    let manifest: PublicationManifest = serde_json::from_slice(&bytes)
+        .map_err(|error| format!("parse {MANIFEST_RELATIVE}: {error}"))?;
+    validate_canonical_json(MANIFEST_RELATIVE, &bytes, &manifest)?;
+    validate_manifest_shape(&manifest)?;
+
+    let schema_bytes = read_regular_file(workspace_root, MANIFEST_SCHEMA_RELATIVE)?;
+    let schema: Value = serde_json::from_slice(&schema_bytes)
+        .map_err(|error| format!("parse {MANIFEST_SCHEMA_RELATIVE}: {error}"))?;
+    validate_canonical_json(MANIFEST_SCHEMA_RELATIVE, &schema_bytes, &schema)?;
+    let instance = serde_json::to_value(&manifest)
+        .map_err(|error| format!("serialize {MANIFEST_RELATIVE}: {error}"))?;
+    validate_json_schema(&schema, &instance)?;
+
+    let sidecar = read_regular_file(workspace_root, MANIFEST_SHA256_RELATIVE)?;
+    if sidecar != format!("{}\n", sha256_hex(&bytes)).as_bytes() {
+        return Err(format!(
+            "{MANIFEST_SHA256_RELATIVE} must authenticate the exact manifest bytes"
+        ));
+    }
+    Ok(())
+}
+
+fn expected_artifacts(workspace_root: &Path) -> Result<Vec<GeneratedArtifact>, String> {
+    validate_immutable_raw_predecessor_under_lock(workspace_root)?;
+    validate_source_contract(workspace_root)?;
+    let schema_bytes = canonical_json_bytes(&manifest_schema())?;
+    let manifest = describe_manifest(workspace_root, &schema_bytes)?;
+    let manifest_bytes = canonical_json_bytes(&manifest)?;
+    let vector_bytes = read_regular_file(workspace_root, VECTOR_RELATIVE)?;
+    Ok(vec![
+        GeneratedArtifact {
+            relative: MANIFEST_RELATIVE,
+            contents: manifest_bytes.clone(),
+        },
+        GeneratedArtifact {
+            relative: MANIFEST_SCHEMA_RELATIVE,
+            contents: schema_bytes,
+        },
+        GeneratedArtifact {
+            relative: MANIFEST_SHA256_RELATIVE,
+            contents: format!("{}\n", sha256_hex(&manifest_bytes)).into_bytes(),
+        },
+        GeneratedArtifact {
+            relative: VECTOR_MIRROR_RELATIVE,
+            contents: vector_bytes,
+        },
+    ])
+}
+
+fn describe_manifest(
+    workspace_root: &Path,
+    schema_bytes: &[u8],
+) -> Result<PublicationManifest, String> {
+    let source_files = source_specs(workspace_root)?
+        .into_iter()
+        .map(|(role, path)| source_descriptor(workspace_root, &role, &path))
+        .collect::<Result<Vec<_>, _>>()?;
+    let vector = validate_result_vector(workspace_root)?;
+    let vector_byte_length = byte_length(VECTOR_RELATIVE, &vector.bytes)?;
+    let vector_sha256 = sha256_hex(&vector.bytes);
+    Ok(PublicationManifest {
+        schema_version: SCHEMA_VERSION,
+        contract_id: CONTRACT_ID.to_owned(),
+        authority_id: AUTHORITY_ID.to_owned(),
+        manifest_schema: descriptor_for_bytes(MANIFEST_SCHEMA_RELATIVE, schema_bytes)?,
+        predecessor: PredecessorDescriptor {
+            contract_id: "radroots_event_store.raw_source_rebuild_v1".to_owned(),
+            manifest: descriptor_for_file(workspace_root, RAW_MANIFEST_RELATIVE)?,
+        },
+        event_contract_registry: RegistryDescriptor {
+            version: 7,
+            inventory: descriptor_for_file(workspace_root, REGISTRY_RELATIVE)?,
+            sidecar: descriptor_for_file(workspace_root, REGISTRY_SIDECAR_RELATIVE)?,
+            evolution: "immutable_registry_v7_plus_additive_publication_authority_v1".to_owned(),
+        },
+        artifact: expected_artifact_descriptor(),
+        operations: expected_operation_descriptors(),
+        predecessor_source_supersessions: RAW_PREDECESSOR_SUPERSEDED_PATHS
+            .iter()
+            .map(|value| (*value).to_owned())
+            .collect(),
+        source_files,
+        result_vector: ResultVectorDescriptor {
+            canonical_path: VECTOR_RELATIVE.to_owned(),
+            mirror_path: VECTOR_MIRROR_RELATIVE.to_owned(),
+            byte_length: vector_byte_length,
+            sha256: vector_sha256,
+            hash_algorithm: HASH_ALGORITHM.to_owned(),
+            executor_path: VECTOR_EXECUTOR_RELATIVE.to_owned(),
+            executor_test: VECTOR_EXECUTOR_TEST.to_owned(),
+            valid_case_ids: vector.valid_case_ids,
+            invalid_case_ids: vector.invalid_case_ids,
+        },
+        release: ReleaseDescriptor {
+            record_path: RELEASE_RELATIVE.to_owned(),
+            change_id: RELEASE_CHANGE_ID.to_owned(),
+            changelog_path: CHANGELOG_RELATIVE.to_owned(),
+            changelog_marker: CHANGELOG_MARKER.to_owned(),
+        },
+    })
+}
+
+fn expected_artifact_descriptor() -> ArtifactDescriptor {
+    ArtifactDescriptor {
+        schema_version: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_SCHEMA_VERSION,
+        validator: "validate_phase1_publication_artifact".to_owned(),
+        semantic_roles: [
+            "profile",
+            "update",
+            "photo_update",
+            "ask",
+            "event",
+            "food_availability",
+        ]
+        .into_iter()
+        .map(str::to_owned)
+        .collect(),
+        serialized_semantic_variants: [
+            "profile",
+            "update",
+            "photo_update",
+            "ask",
+            "event_date",
+            "event_time",
+            "food_availability",
+        ]
+        .into_iter()
+        .map(str::to_owned)
+        .collect(),
+        event_subvariants: ["date", "time"].into_iter().map(str::to_owned).collect(),
+        canonical_encoding: "serde_json_compact_struct_field_order_v1".to_owned(),
+        artifact_max_bytes: RADROOTS_PHASE1_PUBLICATION_ARTIFACT_MAX_BYTES as u64,
+        signed_event_wire_max_bytes: RADROOTS_PHASE1_PUBLICATION_SIGNED_EVENT_MAX_BYTES as u64,
+        media_reference_max_count: RADROOTS_PHASE1_PUBLICATION_MEDIA_MAX_COUNT as u64,
+        envelope_fields: [
+            "schema_version",
+            "semantic_variant",
+            "authored_operation_id",
+            "event_contract_id",
+            "expected_author",
+            "draft",
+            "expected_event_id",
+            "media_references",
+            "artifact_digest",
+        ]
+        .into_iter()
+        .map(str::to_owned)
+        .collect(),
+        draft_fields: ["created_at", "kind", "tags", "content"]
+            .into_iter()
+            .map(str::to_owned)
+            .collect(),
+        media_reference_fields: ["url", "sha256", "size", "media_type"]
+            .into_iter()
+            .map(str::to_owned)
+            .collect(),
+        media_reference_identity:
+            "exact_case_preserving_approved_url_with_descriptor_commitment_v1".to_owned(),
+        primary_media_url_requirement: "blossom_hash_path_extension_required_v1".to_owned(),
+        post_fallback_url_requirement: "approved_blossom_url_extension_optional_v1".to_owned(),
+        digest_algorithm: "sha256_domain_nul_canonical_json_v1".to_owned(),
+        digest_domain: "radroots.phase1.publication-artifact.v1".to_owned(),
+        digest_domain_terminator: "0x00".to_owned(),
+        digest_preimage: "ascii_domain_then_single_nul_then_canonical_envelope_without_digest_v1"
+            .to_owned(),
+        constructors: CONSTRUCTORS
+            .iter()
+            .map(|spec| ConstructorDescriptor {
+                semantic_variant: spec.semantic_variant.to_owned(),
+                serialized_semantic_variant: spec.serialized_semantic_variant.to_owned(),
+                event_variant: spec.event_variant.map(str::to_owned),
+                strict_input: spec.strict_input.to_owned(),
+                constructor: format!("RadrootsPhase1PublicationArtifact::{}", spec.constructor),
+                publication_operation_id: spec.publication_operation_id.to_owned(),
+                authored_operation_id: spec.authored_operation_id.to_owned(),
+                event_contract_id: spec.event_contract_id.to_owned(),
+                kind: spec.kind,
+            })
+            .collect(),
+        denied_inputs: [
+            "arbitrary_event_draft",
+            "raw_json",
+            "numeric_kind",
+            "signed_event",
+            "private_key",
+            "signer",
+        ]
+        .into_iter()
+        .map(str::to_owned)
+        .collect(),
+        reload_capability: "persisted_artifact_only_no_prior_capability_restoration_v1".to_owned(),
+        threat_boundary: [
+            "detects_accidental_corruption",
+            "detects_payload_only_modification",
+            "detects_digest_only_modification",
+            "does_not_authenticate_actor_rewriting_payload_and_digest",
+            "does_not_survive_validator_binary_or_host_compromise",
+            "does_not_restore_byte_verification_or_upload_completion",
+            "does_not_replace_nip01_id_and_signature_verification",
+        ]
+        .into_iter()
+        .map(str::to_owned)
+        .collect(),
+    }
+}
+
+fn expected_operation_descriptors() -> Vec<OperationDescriptor> {
+    CONSTRUCTORS
+        .iter()
+        .map(|spec| OperationDescriptor {
+            id: spec.publication_operation_id.to_owned(),
+            strict_input: spec.strict_input.to_owned(),
+            output: "RadrootsPhase1PublicationArtifact".to_owned(),
+            error_class: "validation_error".to_owned(),
+            signing: "none".to_owned(),
+            transport: "none".to_owned(),
+        })
+        .chain([
+            OperationDescriptor {
+                id: "publication_artifact.to_canonical_json".to_owned(),
+                strict_input: "RadrootsPhase1PublicationArtifact".to_owned(),
+                output: "Bytes".to_owned(),
+                error_class: "none".to_owned(),
+                signing: "none".to_owned(),
+                transport: "none".to_owned(),
+            },
+            OperationDescriptor {
+                id: "publication_artifact.from_canonical_json".to_owned(),
+                strict_input: "Bytes".to_owned(),
+                output: "RadrootsPhase1PublicationArtifact".to_owned(),
+                error_class: "parse_error".to_owned(),
+                signing: "none".to_owned(),
+                transport: "none".to_owned(),
+            },
+        ])
+        .collect()
+}
+
+fn validate_source_contract(workspace_root: &Path) -> Result<(), String> {
+    validate_compiler_authority(workspace_root)?;
+    validate_operations_authority(workspace_root)?;
+    validate_release_authority(workspace_root)?;
+    validate_result_vector(workspace_root)?;
+    let paths = source_specs(workspace_root)?
+        .into_iter()
+        .map(|(_, path)| path)
+        .collect::<BTreeSet<_>>();
+    for required in RAW_PREDECESSOR_SUPERSEDED_PATHS {
+        if !paths.contains(*required) {
+            return Err(format!(
+                "publication successor does not bind superseded predecessor source {required}"
+            ));
+        }
+    }
+    for generated in GENERATED_ARTIFACT_PATHS {
+        if paths.contains(*generated) {
+            return Err(format!(
+                "publication source inventory recursively includes generated artifact {generated}"
+            ));
+        }
+    }
+    Ok(())
+}
+
+fn validate_compiler_authority(workspace_root: &Path) -> Result<(), String> {
+    let toolchain = parse_toml(workspace_root, "rust-toolchain.toml")?;
+    let expected_toolchain: toml::Value = toml::from_str(
+        r#"
+[toolchain]
+channel = "1.97.0"
+components = ["clippy", "rust-analyzer", "rust-src", "rustfmt"]
+targets = ["wasm32-unknown-unknown"]
+"#,
+    )
+    .map_err(|error| format!("parse expected toolchain: {error}"))?;
+    if toolchain != expected_toolchain {
+        return Err("rust-toolchain.toml drifted from Rust 1.97.0 authority".to_owned());
+    }
+    let cargo_config = parse_toml(workspace_root, ".cargo/config.toml")?;
+    let expected_config: toml::Value = toml::from_str("[alias]\nxtask = \"run -q -p xtask --\"\n")
+        .map_err(|error| format!("parse expected Cargo config: {error}"))?;
+    if cargo_config != expected_config {
+        return Err(".cargo/config.toml must remain the xtask alias only".to_owned());
+    }
+    for forbidden in ["rust-toolchain", ".cargo/config"] {
+        match fs::symlink_metadata(workspace_root.join(forbidden)) {
+            Err(error) if error.kind() == std::io::ErrorKind::NotFound => {}
+            Ok(_) => {
+                return Err(format!(
+                    "legacy compiler configuration {forbidden} must be absent"
+                ));
+            }
+            Err(error) => return Err(format!("inspect {forbidden}: {error}")),
+        }
+    }
+
+    for (relative, package_name, expected_hash) in GOVERNED_COMPILER_TABLES {
+        let manifest = parse_toml(workspace_root, relative)?;
+        validate_package_shape(workspace_root, relative, package_name, &manifest)?;
+        let mut tables = BTreeMap::new();
+        for key in ["dependencies", "features"] {
+            tables.insert(
+                key.to_owned(),
+                manifest
+                    .get(key)
+                    .ok_or_else(|| format!("{relative} must declare [{key}]"))?
+                    .clone(),
+            );
+        }
+        if *relative == "crates/event_store/Cargo.toml" {
+            tables.insert(
+                "dev-dependencies".to_owned(),
+                manifest
+                    .get("dev-dependencies")
+                    .ok_or_else(|| format!("{relative} must declare [dev-dependencies]"))?
+                    .clone(),
+            );
+        }
+        let actual = sha256_hex(
+            &serde_json::to_vec(&tables)
+                .map_err(|error| format!("serialize {relative} compiler tables: {error}"))?,
+        );
+        if actual != *expected_hash {
+            return Err(format!(
+                "{relative} compiler tables drifted: expected {expected_hash}, found {actual}"
+            ));
+        }
+    }
+    Ok(())
+}
+
+fn validate_package_shape(
+    workspace_root: &Path,
+    relative: &str,
+    expected_name: &str,
+    manifest: &toml::Value,
+) -> Result<(), String> {
+    let package = manifest
+        .get("package")
+        .and_then(toml::Value::as_table)
+        .ok_or_else(|| format!("{relative} must declare [package]"))?;
+    if package.get("name").and_then(toml::Value::as_str) != Some(expected_name)
+        || package.get("version").and_then(toml::Value::as_str) != Some("1.0.0-alpha.1")
+        || package
+            .get("edition")
+            .and_then(toml::Value::as_table)
+            .and_then(|value| value.get("workspace"))
+            .and_then(toml::Value::as_bool)
+            != Some(true)
+        || package
+            .get("rust-version")
+            .and_then(toml::Value::as_table)
+            .and_then(|value| value.get("workspace"))
+            .and_then(toml::Value::as_bool)
+            != Some(true)
+    {
+        return Err(format!("{relative} package/compiler identity drifted"));
+    }
+    if [
+        "build",
+        "autolib",
+        "autobins",
+        "autoexamples",
+        "autotests",
+        "autobenches",
+    ]
+    .iter()
+    .any(|key| package.contains_key(*key))
+        || [
+            "build-dependencies",
+            "target",
+            "lib",
+            "bin",
+            "example",
+            "test",
+            "bench",
+        ]
+        .iter()
+        .any(|key| manifest.get(*key).is_some())
+    {
+        return Err(format!(
+            "{relative} introduces unapproved build or target authority"
+        ));
+    }
+    let package_root = workspace_root
+        .join(relative)
+        .parent()
+        .ok_or_else(|| format!("{relative} has no package root"))?
+        .to_path_buf();
+    for path in [
+        package_root.join("build.rs"),
+        package_root.join("src/main.rs"),
+        package_root.join("src/bin"),
+    ] {
+        match fs::symlink_metadata(&path) {
+            Err(error) if error.kind() == std::io::ErrorKind::NotFound => {}
+            Ok(_) => {
+                return Err(format!(
+                    "{relative} has unapproved auto-discovered target {}",
+                    path.display()
+                ));
+            }
+            Err(error) => return Err(format!("inspect {}: {error}", path.display())),
+        }
+    }
+    Ok(())
+}
+
+fn validate_operations_authority(workspace_root: &Path) -> Result<(), String> {
+    let manifest = parse_toml(workspace_root, OPERATIONS_RELATIVE)?;
+    let error_classes = toml_string_array(
+        OPERATIONS_RELATIVE,
+        manifest
+            .get("errors")
+            .and_then(|value| value.get("classes")),
+    )?;
+    if error_classes
+        .iter()
+        .filter(|value| value.as_str() == "none")
+        .count()
+        != 1
+    {
+        return Err("error classes must contain none exactly once".to_owned());
+    }
+    let domains = toml_string_array(
+        OPERATIONS_RELATIVE,
+        manifest
+            .get("public")
+            .and_then(|value| value.get("domains")),
+    )?;
+    if domains
+        .iter()
+        .filter(|value| value.as_str() == "publication")
+        .count()
+        != 1
+    {
+        return Err("public domains must contain publication exactly once".to_owned());
+    }
+    let types = toml_string_array(
+        OPERATIONS_RELATIVE,
+        manifest
+            .get("shared_types")
+            .and_then(|value| value.get("public")),
+    )?;
+    for required in PUBLIC_TYPES {
+        if types
+            .iter()
+            .filter(|value| value.as_str() == *required)
+            .count()
+            != 1
+        {
+            return Err(format!(
+                "shared public types must contain {required} exactly once"
+            ));
+        }
+    }
+    let operations = manifest
+        .get("operations")
+        .and_then(toml::Value::as_table)
+        .ok_or_else(|| "operations.toml must declare [operations]".to_owned())?;
+    for forbidden in [
+        "phase1_publication_artifact_build",
+        "phase1_publication_artifact_reload",
+    ] {
+        if operations.contains_key(forbidden) {
+            return Err(format!(
+                "obsolete publication operation {forbidden} is forbidden"
+            ));
+        }
+    }
+    for expected in expected_operation_descriptors() {
+        let (key, expected_inputs) =
+            if let Some(suffix) = expected.id.strip_prefix("publication_artifact.build_") {
+                (
+                    format!("phase1_publication_artifact_build_{suffix}"),
+                    vec![
+                        expected.strict_input.clone(),
+                        "u64".to_owned(),
+                        "String".to_owned(),
+                    ],
+                )
+            } else {
+                match expected.id.as_str() {
+                    "publication_artifact.to_canonical_json" => (
+                        "phase1_publication_artifact_to_canonical_json".to_owned(),
+                        vec![expected.strict_input.clone()],
+                    ),
+                    "publication_artifact.from_canonical_json" => (
+                        "phase1_publication_artifact_from_canonical_json".to_owned(),
+                        vec![expected.strict_input.clone()],
+                    ),
+                    other => return Err(format!("unknown publication operation {other}")),
+                }
+            };
+        let operation = operations
+            .get(&key)
+            .and_then(toml::Value::as_table)
+            .ok_or_else(|| format!("operations.toml is missing {key}"))?;
+        require_toml_string(operation, "domain", "publication", &key)?;
+        require_toml_string(operation, "id", &expected.id, &key)?;
+        require_toml_string(operation, "stability", "beta", &key)?;
+        require_toml_string(operation, "error_class", &expected.error_class, &key)?;
+        require_toml_string(operation, "signing", "none", &key)?;
+        require_toml_string(operation, "transport", "none", &key)?;
+        if operation
+            .get("deterministic")
+            .and_then(toml::Value::as_bool)
+            != Some(true)
+            || toml_string_array(&key, operation.get("inputs"))? != expected_inputs
+            || toml_string_array(&key, operation.get("outputs"))? != [expected.output.clone()]
+        {
+            return Err(format!("{key} signature or determinism drifted"));
+        }
+        let implementation = operation
+            .get("implementation")
+            .and_then(toml::Value::as_table)
+            .ok_or_else(|| format!("{key} implementation is missing"))?;
+        let modules = toml_string_array(&key, implementation.get("rust_modules"))?;
+        if !modules
+            .iter()
+            .any(|path| path == "crates/event_codec/src/wire/publication.rs")
+        {
+            return Err(format!(
+                "{key} does not route to the sealed publication module"
+            ));
+        }
+        let conformance = operation
+            .get("conformance")
+            .and_then(toml::Value::as_table)
+            .ok_or_else(|| format!("{key} conformance is missing"))?;
+        require_toml_string(conformance, "vector", VECTOR_RELATIVE, &key)?;
+        let expected_case_kinds = if expected.id == "publication_artifact.from_canonical_json" {
+            vec![
+                "publication_artifact.from_canonical_json.valid".to_owned(),
+                "publication_artifact.from_canonical_json.invalid".to_owned(),
+            ]
+        } else {
+            vec![format!("{}.valid", expected.id)]
+        };
+        if toml_string_array(&key, conformance.get("case_kinds"))? != expected_case_kinds {
+            return Err(format!("{key} conformance case kinds drifted"));
+        }
+    }
+    Ok(())
+}
+
+fn validate_release_authority(workspace_root: &Path) -> Result<(), String> {
+    let release = parse_toml(workspace_root, RELEASE_RELATIVE)?;
+    let changes = release
+        .get("changes")
+        .and_then(toml::Value::as_array)
+        .ok_or_else(|| format!("{RELEASE_RELATIVE} must declare changes"))?;
+    let matching = changes
+        .iter()
+        .filter(|change| change.get("id").and_then(toml::Value::as_str) == Some(RELEASE_CHANGE_ID))
+        .collect::<Vec<_>>();
+    let [change] = matching.as_slice() else {
+        return Err(format!(
+            "{RELEASE_RELATIVE} must contain {RELEASE_CHANGE_ID} exactly once"
+        ));
+    };
+    if change.get("classification").and_then(toml::Value::as_str) != Some("feature")
+        || toml_string_array(RELEASE_CHANGE_ID, change.get("semver_impacts"))?
+            != [
+                "add_exported_type",
+                "add_exported_function",
+                "add_exported_constant",
+                "add_conformance_vector",
+            ]
+        || change
+            .get("summary")
+            .and_then(toml::Value::as_str)
+            .is_none_or(str::is_empty)
+    {
+        return Err(format!("{RELEASE_CHANGE_ID} release authority drifted"));
+    }
+    let changelog = String::from_utf8(read_regular_file(workspace_root, CHANGELOG_RELATIVE)?)
+        .map_err(|error| format!("{CHANGELOG_RELATIVE} must be UTF-8: {error}"))?;
+    if changelog.matches(CHANGELOG_MARKER).count() != 1 {
+        return Err(format!(
+            "{CHANGELOG_RELATIVE} must contain {CHANGELOG_MARKER} exactly once"
+        ));
+    }
+    Ok(())
+}
+
+fn validate_result_vector(workspace_root: &Path) -> Result<ValidatedResultVector, String> {
+    let bytes = read_regular_file(workspace_root, VECTOR_RELATIVE)?;
+    let suite: VectorSuite = serde_json::from_slice(&bytes)
+        .map_err(|error| format!("parse {VECTOR_RELATIVE}: {error}"))?;
+    if suite.suite != "phase1_publication_artifact" || suite.contract_version != "1.0.0" {
+        return Err(format!("{VECTOR_RELATIVE} identity drifted"));
+    }
+    let mut ids = BTreeSet::new();
+    let mut valid = Vec::new();
+    let mut invalid = Vec::new();
+    for case in suite.vectors {
+        if !ids.insert(case.id.clone()) {
+            return Err(format!("{VECTOR_RELATIVE} duplicates case {}", case.id));
+        }
+        if !case.input.is_object() || !case.expected.is_object() {
+            return Err(format!("vector case {} must use object data", case.id));
+        }
+        if case.kind == INVALID_VECTOR_KIND {
+            invalid.push(case.id);
+        } else if VALID_VECTOR_CASES
+            .iter()
+            .any(|(id, kind)| *id == case.id && *kind == case.kind)
+        {
+            valid.push((case.id, case.kind));
+        } else {
+            return Err(format!(
+                "vector case {} uses unknown or mismatched kind {}",
+                case.id, case.kind
+            ));
+        }
+    }
+    let expected_valid = VALID_VECTOR_CASES
+        .iter()
+        .map(|(id, kind)| ((*id).to_owned(), (*kind).to_owned()))
+        .collect::<Vec<_>>();
+    if valid != expected_valid {
+        return Err(format!(
+            "{VECTOR_RELATIVE} valid inventory drifted: expected {expected_valid:?}, found {valid:?}"
+        ));
+    }
+    for required in REQUIRED_INVALID_VECTOR_IDS {
+        if invalid
+            .iter()
+            .filter(|value| value.as_str() == *required)
+            .count()
+            != 1
+        {
+            return Err(format!(
+                "{VECTOR_RELATIVE} must contain invalid case {required} exactly once"
+            ));
+        }
+    }
+    Ok(ValidatedResultVector {
+        valid_case_ids: valid.into_iter().map(|(id, _)| id).collect(),
+        invalid_case_ids: invalid,
+        bytes,
+    })
+}
+
+fn validate_immutable_raw_predecessor_under_lock(workspace_root: &Path) -> Result<(), String> {
+    for spec in RAW_IMMUTABLE_ARTIFACTS {
+        let bytes = read_regular_file(workspace_root, spec.relative)?;
+        if bytes.len() != spec.byte_length || sha256_hex(&bytes) != spec.sha256 {
+            return Err(format!(
+                "immutable raw-source rebuild predecessor artifact {} drifted",
+                spec.relative
+            ));
+        }
+    }
+    let manifest_bytes = read_regular_file(workspace_root, RAW_MANIFEST_RELATIVE)?;
+    let manifest: Value = serde_json::from_slice(&manifest_bytes)
+        .map_err(|error| format!("parse {RAW_MANIFEST_RELATIVE}: {error}"))?;
+    if manifest.get("schema_version").and_then(Value::as_u64) != Some(1)
+        || manifest.get("contract_id").and_then(Value::as_str)
+            != Some("radroots_event_store.raw_source_rebuild_v1")
+    {
+        return Err(format!("{RAW_MANIFEST_RELATIVE} identity drifted"));
+    }
+    let sidecar = read_regular_file(workspace_root, RAW_MANIFEST_SHA256_RELATIVE)?;
+    if sidecar != format!("{}\n", sha256_hex(&manifest_bytes)).as_bytes() {
+        return Err(format!(
+            "{RAW_MANIFEST_SHA256_RELATIVE} does not authenticate its manifest"
+        ));
+    }
+
+    let superseded = RAW_PREDECESSOR_SUPERSEDED_PATHS
+        .iter()
+        .copied()
+        .collect::<BTreeSet<_>>();
+    if superseded.len() != RAW_PREDECESSOR_SUPERSEDED_PATHS.len() {
+        return Err("raw predecessor supersession paths must be unique".to_owned());
+    }
+    let sources = manifest
+        .get("source_files")
+        .and_then(Value::as_array)
+        .ok_or_else(|| format!("{RAW_MANIFEST_RELATIVE} has no source_files array"))?;
+    let mut seen = BTreeSet::new();
+    for source in sources {
+        let path = descriptor_path(source, "raw predecessor source")?;
+        if !seen.insert(path) {
+            return Err(format!("{RAW_MANIFEST_RELATIVE} duplicates source {path}"));
+        }
+        if !superseded.contains(path) {
+            validate_value_descriptor(workspace_root, source, "raw predecessor source")?;
+        }
+    }
+    for path in superseded {
+        if !seen.contains(path) {
+            return Err(format!(
+                "raw predecessor supersession path {path} is not predecessor-bound"
+            ));
+        }
+    }
+    for descriptor in manifest
+        .get("migration_inventory")
+        .and_then(Value::as_array)
+        .ok_or_else(|| format!("{RAW_MANIFEST_RELATIVE} has no migration inventory"))?
+    {
+        validate_value_descriptor(workspace_root, descriptor, "raw migration")?;
+    }
+    validate_value_descriptor(
+        workspace_root,
+        manifest
+            .get("manifest_schema")
+            .ok_or_else(|| format!("{RAW_MANIFEST_RELATIVE} has no manifest_schema"))?,
+        "raw manifest schema",
+    )?;
+    validate_value_descriptor(
+        workspace_root,
+        manifest
+            .pointer("/predecessor/manifest")
+            .ok_or_else(|| format!("{RAW_MANIFEST_RELATIVE} has no predecessor manifest"))?,
+        "raw predecessor manifest",
+    )?;
+    let executor = json!({
+        "path": RAW_VECTOR_EXECUTOR_RELATIVE,
+        "byte_length": manifest.pointer("/result_vector/executor_byte_length"),
+        "sha256": manifest.pointer("/result_vector/executor_sha256"),
+        "hash_algorithm": manifest.pointer("/result_vector/executor_hash_algorithm"),
+    });
+    validate_value_descriptor(workspace_root, &executor, "raw vector executor")?;
+    if read_regular_file(workspace_root, RAW_VECTOR_RELATIVE)?
+        != read_regular_file(workspace_root, RAW_VECTOR_MIRROR_RELATIVE)?
+    {
+        return Err("immutable raw-source rebuild vector mirror drifted".to_owned());
+    }
+    Ok(())
+}
+
+fn validate_value_descriptor(
+    workspace_root: &Path,
+    descriptor: &Value,
+    label: &str,
+) -> Result<(), String> {
+    let path = descriptor_path(descriptor, label)?;
+    let expected_len = descriptor
+        .get("byte_length")
+        .and_then(Value::as_u64)
+        .ok_or_else(|| format!("{label} {path} has no byte_length"))?;
+    let expected_sha = descriptor
+        .get("sha256")
+        .and_then(Value::as_str)
+        .ok_or_else(|| format!("{label} {path} has no sha256"))?;
+    if descriptor.get("hash_algorithm").and_then(Value::as_str) != Some(HASH_ALGORITHM) {
+        return Err(format!("{label} {path} has an unsupported hash algorithm"));
+    }
+    let bytes = read_regular_file(workspace_root, path)?;
+    if bytes.len() as u64 != expected_len || sha256_hex(&bytes) != expected_sha {
+        return Err(format!(
+            "{label} {path} drifted from its predecessor descriptor"
+        ));
+    }
+    Ok(())
+}
+
+fn descriptor_path<'a>(descriptor: &'a Value, label: &str) -> Result<&'a str, String> {
+    descriptor
+        .get("path")
+        .and_then(Value::as_str)
+        .ok_or_else(|| format!("{label} has no path"))
+}
+
+fn source_specs(workspace_root: &Path) -> Result<Vec<(String, String)>, String> {
+    let mut specs = Vec::new();
+    for root in PUBLIC_SOURCE_ROOTS {
+        for path in regular_file_inventory(workspace_root, root)? {
+            if !path.ends_with(".rs") {
+                return Err(format!("{root} contains non-Rust production source {path}"));
+            }
+            specs.push(("public_production_source".to_owned(), path));
+        }
+    }
+    specs.extend(
+        EXPLICIT_SOURCE_SPECS
+            .iter()
+            .map(|(role, path)| ((*role).to_owned(), (*path).to_owned())),
+    );
+    specs.sort_by(|left, right| left.1.cmp(&right.1));
+    let mut seen = BTreeSet::new();
+    for (_, path) in &specs {
+        if !seen.insert(path.as_str()) {
+            return Err(format!("publication source inventory duplicates {path}"));
+        }
+    }
+    Ok(specs)
+}
+
+fn regular_file_inventory(workspace_root: &Path, relative: &str) -> Result<Vec<String>, String> {
+    let mut pending = vec![workspace_root.join(relative)];
+    let mut files = Vec::new();
+    while let Some(directory) = pending.pop() {
+        let mut entries = fs::read_dir(&directory)
+            .map_err(|error| format!("read {}: {error}", directory.display()))?
+            .collect::<Result<Vec<_>, _>>()
+            .map_err(|error| format!("read {} entry: {error}", directory.display()))?;
+        entries.sort_by_key(|entry| entry.file_name());
+        for entry in entries {
+            let file_type = entry
+                .file_type()
+                .map_err(|error| format!("inspect {}: {error}", entry.path().display()))?;
+            if file_type.is_symlink() {
+                return Err(format!(
+                    "governed source inventory forbids symlink {}",
+                    entry.path().display()
+                ));
+            }
+            if file_type.is_dir() {
+                pending.push(entry.path());
+            } else if file_type.is_file() {
+                files.push(
+                    entry
+                        .path()
+                        .strip_prefix(workspace_root)
+                        .map_err(|error| format!("relativize {}: {error}", entry.path().display()))?
+                        .to_string_lossy()
+                        .replace('\\', "/"),
+                );
+            } else {
+                return Err(format!(
+                    "governed inventory requires regular files: {}",
+                    entry.path().display()
+                ));
+            }
+        }
+    }
+    files.sort();
+    Ok(files)
+}
+
+fn source_descriptor(
+    workspace_root: &Path,
+    role: &str,
+    path: &str,
+) -> Result<SourceFileDescriptor, String> {
+    let bytes = read_regular_file(workspace_root, path)?;
+    Ok(SourceFileDescriptor {
+        role: role.to_owned(),
+        path: path.to_owned(),
+        byte_length: byte_length(path, &bytes)?,
+        sha256: sha256_hex(&bytes),
+        hash_algorithm: HASH_ALGORITHM.to_owned(),
+    })
+}
+
+fn descriptor_for_file(workspace_root: &Path, path: &str) -> Result<FileDescriptor, String> {
+    descriptor_for_bytes(path, &read_regular_file(workspace_root, path)?)
+}
+
+fn descriptor_for_bytes(path: &str, bytes: &[u8]) -> Result<FileDescriptor, String> {
+    Ok(FileDescriptor {
+        path: path.to_owned(),
+        byte_length: byte_length(path, bytes)?,
+        sha256: sha256_hex(bytes),
+        hash_algorithm: HASH_ALGORITHM.to_owned(),
+    })
+}
+
+fn byte_length(path: &str, bytes: &[u8]) -> Result<u64, String> {
+    u64::try_from(bytes.len()).map_err(|_| format!("{path} byte length exceeds u64"))
+}
+
+fn parse_toml(workspace_root: &Path, relative: &str) -> Result<toml::Value, String> {
+    let bytes = read_regular_file(workspace_root, relative)?;
+    let source = std::str::from_utf8(&bytes)
+        .map_err(|error| format!("{relative} must be UTF-8: {error}"))?;
+    toml::from_str(source).map_err(|error| format!("parse {relative}: {error}"))
+}
+
+fn toml_string_array(label: &str, value: Option<&toml::Value>) -> Result<Vec<String>, String> {
+    value
+        .and_then(toml::Value::as_array)
+        .ok_or_else(|| format!("{label} must be an array"))?
+        .iter()
+        .map(|value| {
+            value
+                .as_str()
+                .map(str::to_owned)
+                .ok_or_else(|| format!("{label} values must be strings"))
+        })
+        .collect()
+}
+
+fn require_toml_string(
+    table: &toml::map::Map<String, toml::Value>,
+    field: &str,
+    expected: &str,
+    label: &str,
+) -> Result<(), String> {
+    if table.get(field).and_then(toml::Value::as_str) != Some(expected) {
+        return Err(format!("{label}.{field} must be {expected}"));
+    }
+    Ok(())
+}
+
+fn validate_manifest_shape(manifest: &PublicationManifest) -> Result<(), String> {
+    if manifest.schema_version != SCHEMA_VERSION
+        || manifest.contract_id != CONTRACT_ID
+        || manifest.authority_id != AUTHORITY_ID
+        || manifest.artifact != expected_artifact_descriptor()
+        || manifest.operations != expected_operation_descriptors()
+        || manifest.predecessor_source_supersessions
+            != RAW_PREDECESSOR_SUPERSEDED_PATHS
+                .iter()
+                .map(|value| (*value).to_owned())
+                .collect::<Vec<_>>()
+        || manifest.release.change_id != RELEASE_CHANGE_ID
+        || manifest.result_vector.canonical_path != VECTOR_RELATIVE
+        || manifest.result_vector.mirror_path != VECTOR_MIRROR_RELATIVE
+    {
+        return Err(format!("{MANIFEST_RELATIVE} shape drifted"));
+    }
+    let mut paths = BTreeSet::new();
+    for source in &manifest.source_files {
+        if source.hash_algorithm != HASH_ALGORITHM || !paths.insert(source.path.as_str()) {
+            return Err(format!("{MANIFEST_RELATIVE} source inventory is invalid"));
+        }
+    }
+    Ok(())
+}
+
+fn canonical_json_bytes<T: Serialize>(value: &T) -> Result<Vec<u8>, String> {
+    let mut bytes =
+        serde_json::to_vec_pretty(value).map_err(|error| format!("serialize JSON: {error}"))?;
+    bytes.push(b'\n');
+    Ok(bytes)
+}
+
+fn validate_canonical_json<T: Serialize>(
+    relative: &str,
+    bytes: &[u8],
+    value: &T,
+) -> Result<(), String> {
+    if canonical_json_bytes(value)? != bytes {
+        return Err(format!("{relative} is not canonical pretty JSON"));
+    }
+    Ok(())
+}
+
+fn sha256_hex(bytes: &[u8]) -> String {
+    hex::encode(Sha256::digest(bytes))
+}
+
+fn validate_json_schema(schema: &Value, instance: &Value) -> Result<(), String> {
+    let validator = jsonschema::validator_for(schema)
+        .map_err(|error| format!("compile {MANIFEST_SCHEMA_RELATIVE}: {error}"))?;
+    let errors = validator
+        .iter_errors(instance)
+        .map(|error| error.to_string())
+        .collect::<Vec<_>>();
+    if errors.is_empty() {
+        Ok(())
+    } else {
+        Err(format!(
+            "{MANIFEST_RELATIVE} violates its schema: {}",
+            errors.join("; ")
+        ))
+    }
+}
+
+fn manifest_schema() -> Value {
+    json!({
+        "$schema": "https://json-schema.org/draft/2020-12/schema",
+        "$id": "https://radroots.org/contracts/event-codec/phase1-publication-artifact-v1.schema.json",
+        "title": "Radroots Phase 1 Publication Artifact Contract",
+        "type": "object",
+        "additionalProperties": false,
+        "required": [
+            "schema_version",
+            "contract_id",
+            "authority_id",
+            "manifest_schema",
+            "predecessor",
+            "event_contract_registry",
+            "artifact",
+            "operations",
+            "predecessor_source_supersessions",
+            "source_files",
+            "result_vector",
+            "release"
+        ],
+        "properties": {
+            "schema_version": {"const": SCHEMA_VERSION},
+            "contract_id": {"const": CONTRACT_ID},
+            "authority_id": {"const": AUTHORITY_ID},
+            "manifest_schema": {"$ref": "#/$defs/file"},
+            "predecessor": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["contract_id", "manifest"],
+                "properties": {
+                    "contract_id": {"const": "radroots_event_store.raw_source_rebuild_v1"},
+                    "manifest": {"$ref": "#/$defs/file"}
+                }
+            },
+            "event_contract_registry": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["version", "inventory", "sidecar", "evolution"],
+                "properties": {
+                    "version": {"const": 7},
+                    "inventory": {"$ref": "#/$defs/file"},
+                    "sidecar": {"$ref": "#/$defs/file"},
+                    "evolution": {"type": "string", "minLength": 1}
+                }
+            },
+            "artifact": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": [
+                    "schema_version",
+                    "validator",
+                    "semantic_roles",
+                    "serialized_semantic_variants",
+                    "event_subvariants",
+                    "canonical_encoding",
+                    "artifact_max_bytes",
+                    "signed_event_wire_max_bytes",
+                    "media_reference_max_count",
+                    "envelope_fields",
+                    "draft_fields",
+                    "media_reference_fields",
+                    "media_reference_identity",
+                    "primary_media_url_requirement",
+                    "post_fallback_url_requirement",
+                    "digest_algorithm",
+                    "digest_domain",
+                    "digest_domain_terminator",
+                    "digest_preimage",
+                    "constructors",
+                    "denied_inputs",
+                    "reload_capability",
+                    "threat_boundary"
+                ],
+                "properties": {
+                    "schema_version": {"const": 1},
+                    "validator": {"const": "validate_phase1_publication_artifact"},
+                    "semantic_roles": {"const": ["profile", "update", "photo_update", "ask", "event", "food_availability"]},
+                    "serialized_semantic_variants": {"const": ["profile", "update", "photo_update", "ask", "event_date", "event_time", "food_availability"]},
+                    "event_subvariants": {"const": ["date", "time"]},
+                    "canonical_encoding": {"const": "serde_json_compact_struct_field_order_v1"},
+                    "artifact_max_bytes": {"const": 2097152},
+                    "signed_event_wire_max_bytes": {"const": 262144},
+                    "media_reference_max_count": {"const": 4096},
+                    "envelope_fields": {"const": ["schema_version", "semantic_variant", "authored_operation_id", "event_contract_id", "expected_author", "draft", "expected_event_id", "media_references", "artifact_digest"]},
+                    "draft_fields": {"const": ["created_at", "kind", "tags", "content"]},
+                    "media_reference_fields": {"const": ["url", "sha256", "size", "media_type"]},
+                    "media_reference_identity": {"const": "exact_case_preserving_approved_url_with_descriptor_commitment_v1"},
+                    "primary_media_url_requirement": {"const": "blossom_hash_path_extension_required_v1"},
+                    "post_fallback_url_requirement": {"const": "approved_blossom_url_extension_optional_v1"},
+                    "digest_algorithm": {"const": "sha256_domain_nul_canonical_json_v1"},
+                    "digest_domain": {"const": "radroots.phase1.publication-artifact.v1"},
+                    "digest_domain_terminator": {"const": "0x00"},
+                    "digest_preimage": {"const": "ascii_domain_then_single_nul_then_canonical_envelope_without_digest_v1"},
+                    "constructors": {
+                        "type": "array",
+                        "minItems": 7,
+                        "maxItems": 7,
+                        "items": {"$ref": "#/$defs/constructor"}
+                    },
+                    "denied_inputs": {"const": ["arbitrary_event_draft", "raw_json", "numeric_kind", "signed_event", "private_key", "signer"]},
+                    "reload_capability": {"const": "persisted_artifact_only_no_prior_capability_restoration_v1"},
+                    "threat_boundary": {"const": ["detects_accidental_corruption", "detects_payload_only_modification", "detects_digest_only_modification", "does_not_authenticate_actor_rewriting_payload_and_digest", "does_not_survive_validator_binary_or_host_compromise", "does_not_restore_byte_verification_or_upload_completion", "does_not_replace_nip01_id_and_signature_verification"]}
+                }
+            },
+            "operations": {
+                "type": "array",
+                "minItems": 9,
+                "maxItems": 9,
+                "items": {"$ref": "#/$defs/operation"}
+            },
+            "predecessor_source_supersessions": {
+                "type": "array",
+                "minItems": 6,
+                "maxItems": 6,
+                "items": {"type": "string", "minLength": 1}
+            },
+            "source_files": {
+                "type": "array",
+                "minItems": 1,
+                "items": {"$ref": "#/$defs/source"}
+            },
+            "result_vector": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": [
+                    "canonical_path",
+                    "mirror_path",
+                    "byte_length",
+                    "sha256",
+                    "hash_algorithm",
+                    "executor_path",
+                    "executor_test",
+                    "valid_case_ids",
+                    "invalid_case_ids"
+                ],
+                "properties": {
+                    "canonical_path": {"const": VECTOR_RELATIVE},
+                    "mirror_path": {"const": VECTOR_MIRROR_RELATIVE},
+                    "byte_length": {"type": "integer", "minimum": 1},
+                    "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
+                    "hash_algorithm": {"const": HASH_ALGORITHM},
+                    "executor_path": {"const": VECTOR_EXECUTOR_RELATIVE},
+                    "executor_test": {"const": VECTOR_EXECUTOR_TEST},
+                    "valid_case_ids": {"type": "array", "minItems": 7, "items": {"type": "string"}},
+                    "invalid_case_ids": {"type": "array", "minItems": 24, "items": {"type": "string"}}
+                }
+            },
+            "release": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["record_path", "change_id", "changelog_path", "changelog_marker"],
+                "properties": {
+                    "record_path": {"const": RELEASE_RELATIVE},
+                    "change_id": {"const": RELEASE_CHANGE_ID},
+                    "changelog_path": {"const": CHANGELOG_RELATIVE},
+                    "changelog_marker": {"const": CHANGELOG_MARKER}
+                }
+            }
+        },
+        "$defs": {
+            "file": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["path", "byte_length", "sha256", "hash_algorithm"],
+                "properties": {
+                    "path": {"type": "string", "minLength": 1},
+                    "byte_length": {"type": "integer", "minimum": 1},
+                    "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
+                    "hash_algorithm": {"const": HASH_ALGORITHM}
+                }
+            },
+            "source": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["role", "path", "byte_length", "sha256", "hash_algorithm"],
+                "properties": {
+                    "role": {"type": "string", "minLength": 1},
+                    "path": {"type": "string", "minLength": 1},
+                    "byte_length": {"type": "integer", "minimum": 1},
+                    "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
+                    "hash_algorithm": {"const": HASH_ALGORITHM}
+                }
+            },
+            "constructor": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": [
+                    "semantic_variant",
+                    "serialized_semantic_variant",
+                    "event_variant",
+                    "strict_input",
+                    "constructor",
+                    "publication_operation_id",
+                    "authored_operation_id",
+                    "event_contract_id",
+                    "kind"
+                ],
+                "properties": {
+                    "semantic_variant": {"type": "string", "minLength": 1},
+                    "serialized_semantic_variant": {"type": "string", "minLength": 1},
+                    "event_variant": {"type": ["string", "null"]},
+                    "strict_input": {"type": "string", "minLength": 1},
+                    "constructor": {"type": "string", "minLength": 1},
+                    "publication_operation_id": {"type": "string", "minLength": 1},
+                    "authored_operation_id": {"type": "string", "minLength": 1},
+                    "event_contract_id": {"type": "string", "minLength": 1},
+                    "kind": {"type": "integer", "minimum": 0}
+                }
+            },
+            "operation": {
+                "type": "object",
+                "additionalProperties": false,
+                "required": ["id", "strict_input", "output", "error_class", "signing", "transport"],
+                "properties": {
+                    "id": {"type": "string", "minLength": 1},
+                    "strict_input": {"type": "string", "minLength": 1},
+                    "output": {"enum": ["RadrootsPhase1PublicationArtifact", "Bytes"]},
+                    "error_class": {"enum": ["none", "validation_error", "parse_error"]},
+                    "signing": {"const": "none"},
+                    "transport": {"const": "none"}
+                }
+            }
+        }
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::PathBuf;
+
+    fn workspace_root() -> PathBuf {
+        Path::new(env!("CARGO_MANIFEST_DIR"))
+            .parent()
+            .and_then(Path::parent)
+            .expect("xtask workspace root")
+            .to_path_buf()
+    }
+
+    #[test]
+    fn publication_source_inventory_is_closed_and_unique() {
+        let root = workspace_root();
+        let specs = source_specs(&root).expect("publication source inventory");
+        let paths = specs
+            .iter()
+            .map(|(_, path)| path.as_str())
+            .collect::<BTreeSet<_>>();
+        assert_eq!(paths.len(), specs.len());
+        assert!(paths.contains("crates/event_codec/src/wire/publication.rs"));
+        assert!(paths.contains("tools/xtask/src/contract/phase1_publication_artifact.rs"));
+        for generated in GENERATED_ARTIFACT_PATHS {
+            assert!(!paths.contains(generated));
+        }
+    }
+
+    #[test]
+    fn publication_compiler_operations_and_vector_authority_are_current() {
+        let root = workspace_root();
+        validate_compiler_authority(&root).expect("compiler authority");
+        validate_operations_authority(&root).expect("operations authority");
+        validate_result_vector(&root).expect("result vector");
+    }
+
+    #[test]
+    fn publication_manifest_schema_rejects_unknown_top_level_fields() {
+        let root = workspace_root();
+        let schema_bytes = canonical_json_bytes(&manifest_schema()).expect("schema");
+        let manifest = describe_manifest(&root, &schema_bytes).expect("manifest");
+        let mut value = serde_json::to_value(manifest).expect("manifest value");
+        validate_json_schema(&manifest_schema(), &value).expect("valid manifest");
+        value["unexpected"] = Value::Bool(true);
+        validate_json_schema(&manifest_schema(), &value).expect_err("unknown field must fail");
+    }
+}
diff --git a/tools/xtask/src/contract/raw_source_rebuild.rs b/tools/xtask/src/contract/raw_source_rebuild.rs
@@ -7271,17 +7271,14 @@ mod tests {
     #[test]
     fn generated_bundle_render_is_deterministic() {
         let root = workspace_root();
-        let first = expected_artifacts(&root)
-            .expect("first render")
-            .into_iter()
-            .map(|artifact| (artifact.relative, artifact.contents))
-            .collect::<Vec<_>>();
-        let second = expected_artifacts(&root)
-            .expect("second render")
-            .into_iter()
-            .map(|artifact| (artifact.relative, artifact.contents))
-            .collect::<Vec<_>>();
-        assert_eq!(first, second);
+        crate::contract::phase1_publication_artifact::validate_immutable_raw_source_rebuild_predecessor(
+            &root,
+        )
+        .expect("first immutable predecessor validation");
+        crate::contract::phase1_publication_artifact::validate_immutable_raw_source_rebuild_predecessor(
+            &root,
+        )
+        .expect("second immutable predecessor validation");
     }
 
     #[test]
@@ -7489,13 +7486,15 @@ mod tests {
 
     #[test]
     fn schema_rejects_unknown_runtime_fields() {
-        let schema = manifest_schema();
         let root = workspace_root();
-        let schema_bytes = canonical_json_bytes(&schema).expect("schema bytes");
-        let mut manifest = serde_json::to_value(
-            describe_manifest(&root, &schema_bytes).expect("current manifest"),
+        let schema: Value = serde_json::from_slice(
+            &read_regular_file(&root, MANIFEST_SCHEMA_RELATIVE).expect("immutable schema bytes"),
+        )
+        .expect("immutable schema");
+        let mut manifest: Value = serde_json::from_slice(
+            &read_regular_file(&root, MANIFEST_RELATIVE).expect("immutable manifest bytes"),
         )
-        .expect("manifest value");
+        .expect("immutable manifest");
         manifest
             .pointer_mut("/runtime")
             .and_then(Value::as_object_mut)
diff --git a/tools/xtask/src/main.rs b/tools/xtask/src/main.rs
@@ -22,6 +22,7 @@ fn usage() {
     eprintln!("  cargo xtask contract food-availability-projection-manifest [--write]");
     eprintln!("  cargo xtask contract source-maintenance-manifest [--write]");
     eprintln!("  cargo xtask contract raw-source-rebuild-manifest [--write]");
+    eprintln!("  cargo xtask contract phase1-publication-artifact-manifest [--write]");
     eprintln!("  cargo xtask contract knowledge-manifest [--write]");
     eprintln!("  cargo xtask dto-roots --check|--write");
     eprintln!("  cargo xtask release preflight");
@@ -138,6 +139,16 @@ fn run_contract(args: &[String]) -> Result<(), String> {
                 "raw-source-rebuild-manifest accepts no arguments or exactly --write".to_string(),
             ),
         },
+        Some("phase1-publication-artifact-manifest") => match &args[1..] {
+            [] => contract::validate_phase1_publication_artifact_manifest(&workspace_root()),
+            [flag] if flag == "--write" => {
+                contract::write_phase1_publication_artifact_manifest(&workspace_root())
+            }
+            _ => Err(
+                "phase1-publication-artifact-manifest accepts no arguments or exactly --write"
+                    .to_string(),
+            ),
+        },
         Some("knowledge-manifest") => {
             if args.get(1).map(String::as_str) == Some("--write") {
                 contract::write_knowledge_contract_manifest(&workspace_root())
@@ -264,6 +275,12 @@ mod tests {
         ])
         .expect_err("invalid raw-source rebuild manifest mode");
         assert!(invalid_raw_source_rebuild.contains("exactly --write"));
+        let invalid_publication = run_contract(&[
+            "phase1-publication-artifact-manifest".to_string(),
+            "--invalid".to_string(),
+        ])
+        .expect_err("invalid Phase 1 publication manifest mode");
+        assert!(invalid_publication.contains("exactly --write"));
 
         let unknown_root = run(&["unknown".to_string()]).expect_err("unknown command");
         assert!(unknown_root.contains("unknown command"));
@@ -365,6 +382,8 @@ mod tests {
             .expect("contract SourceMaintenance manifest");
         run_contract(&["raw-source-rebuild-manifest".to_string()])
             .expect("contract raw-source rebuild manifest");
+        run_contract(&["phase1-publication-artifact-manifest".to_string()])
+            .expect("contract Phase 1 publication artifact manifest");
         run_contract(&["knowledge-manifest".to_string()]).expect("contract knowledge manifest");
     }
 }

	lib Core libraries for Radroots git clone https://radroots.dev/git/lib.git
	Log \| Files \| Refs \| README

M	CHANGELOG.md	\|	13	+++++++++++++
A	contracts/conformance/vectors/publication/phase1_artifact.v1.json	\|	335	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	contracts/operations.toml	\|	252	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	contracts/releases/1.0.0-alpha.1.toml	\|	11	+++++++++++
M	crates/event_codec/Cargo.toml	\|	2	+-
M	crates/event_codec/README	\|	23	+++++++++++++++++++++++
A	crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.json	\|	2387	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.schema.json	\|	493	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	crates/event_codec/contracts/phase1_publication_artifact_v1.manifest.sha256	\|	1	+
M	crates/event_codec/src/lib.rs	\|	2	+-
M	crates/event_codec/src/wire.rs	\|	3	+++
A	crates/event_codec/src/wire/publication.rs	\|	1596	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	crates/event_codec/tests/codec_error_job.rs	\|	13	+++++++++++++
A	crates/event_codec/tests/fixtures/phase1_publication_artifact.v1.json	\|	335	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	crates/event_codec/tests/publication_artifact.rs	\|	936	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	tools/xtask/src/contract.rs	\|	24	+++++++++++++++++++++---
M	tools/xtask/src/contract/nip09_reconciliation.rs	\|	38	+++++++++++++++++++++++++++++++++++++-
A	tools/xtask/src/contract/phase1_publication_artifact.rs	\|	1819	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M	tools/xtask/src/contract/raw_source_rebuild.rs	\|	31	+++++++++++++++----------------
M	tools/xtask/src/main.rs	\|	19	+++++++++++++++++++