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Buzz renders one card per `kind:30617`, so a project spanning several repositories has no representation. [NIP-MP](https://github.com/block/buzz/pull/3163) defines `kind:30621` as an addressable container holding a group's name, description, channel binding, and member coordinates. This adds the kind to `buzz-core` and its structural validation to the relay ingest path. ## Event shape ```json { "kind": 30621, "tags": [ ["d", "platform"], ["name", "Platform"], ["description", "Relay, desktop, and mobile."], ["a", "30617:<owner-a-hex>:buzz"], ["a", "30617:<owner-b-hex>:buzz-infra"], ["buzz-channel", "<channel-uuid>"], ["buzz-visibility", "listed"] ] } ``` ## Validation at ingest | Rule | Behavior | |------|----------| | `d` tag | exactly one, non-empty (length already bounded by the generic `D_TAG_MAX_LEN` check) | | member `a` tag arity | exactly 2 or 3 elements per NIP-01's `a` tag grammar; a 4th element has no defined meaning and is rejected | | member `a` tag coordinate | must parse as `30617:<lowercase-64-hex-owner>:<non-empty-d>` | | duplicate members | rejected on exact string match of the canonical coordinate | | member cap | 64, counted over raw `a` tags | | metadata cardinality | at most one each of `name`, `description`, `buzz-channel`, `buzz-visibility` | | metadata length | `name` ≤ 256 bytes, `description` ≤ 2048 bytes, `buzz-channel` ≤ 256 bytes, `buzz-visibility` ≤ 256 bytes | | zero members | valid | | unknown tags | ignored | Rejection order is normative so a client can predict which rule fires: `d`-cardinality → `d`-empty → member-cap → member-arity → coordinate parse → member-duplicate → metadata cardinality → metadata length. ## Design notes **No membership authorization.** Members are `a` tags, so one project may name repositories owned by different pubkeys — the entire point of the kind. That is safe because membership grants nothing: push policy reads a repository's own `kind:30617` (`api/git/policy.rs`) and never a project. `buzz-channel` is a metadata reference, not a routing directive, so projects are classified global-only. **Owner-only editing is free.** NIP-33 addressing keys replacement on `(pubkey, kind, d)`, so one signer can never overwrite another's project. No relay-side permission check exists or is needed, and `test_project_same_d_under_two_authors_are_independent` pins it. **Duplicates are rejected, not deduped.** A relay cannot rewrite tags inside a signed event without invalidating its id and signature, so the alternative to rejection is a stored duplicate-member head that every consumer must apply a first-wins rule to. **The cap is checked before the duplicate set is built.** Counting raw `a` tags rather than distinct coordinates means an event naming one coordinate thousands of times is refused on count, instead of being bounded only by the relay frame limit. **No side-effect handler.** Generic NIP-33 replacement and generic NIP-09 coordinate soft-delete already cover replacement and deletion; `kind:30621` needs no entry in `is_side_effect_kind`. ## Generic NIP-09 fix carried along `soft_delete_by_coordinate` (`crates/buzz-db/src/event.rs`) previously deleted the live coordinate head regardless of the tombstone's own `created_at`, so a delayed or replayed `a`-tag deletion signed between two versions destroyed the newer replacement. NIP-09 scopes an `a`-tag deletion to versions at or before the deletion request, so the `UPDATE` now carries `created_at <= $5` and `handle_a_tag_deletion` threads the deletion event's `created_at` through. The bug predates `kind:30621` and affected every parameterized-replaceable kind on the generic path — `kind:30617` repository announcements included — so the fix lands there rather than as a project special case. `events.created_at` is immutable per row, so the predicate guarantees a tombstone can never erase a version newer than itself; the UPDATE re-evaluates its WHERE clause after any lock wait. Under READ COMMITTED, a same-coordinate replacement racing the deletion may cause the deletion to evaluate before the new head lands, returning `Ok(false)` — but that outcome is state-identical to the deletion having arrived first, a valid Nostr ordering Nostr never fixes. The return value feeds only a debug log. No coordinate-level lock is needed. ## Coverage 32 unit tests in `crates/buzz-relay/src/handlers/ingest.rs` pin the envelope contract (accept: minimal, cross-owner, zero-member, same repo `d` under two owners, colon-bearing repo `d`, cap boundary, unknown tags, relay hint on member `a` tag, max-length metadata, stranger-owned member, uninterpreted metadata values, non-empty content; reject: every rule above plus valueless `d`/`a` tags). A fixture-driven test (`project_envelope_validates_all_shared_fixtures`) runs every case in the shared `NIP-MP.fixtures.json` oracle (11 accept + 20 reject) against `validate_project_envelope`, so any future change that breaks a case turns the test suite red. 6 `#[ignore]`d e2e tests in `crates/buzz-test-client/tests/e2e_project.rs` cover behavior that only exists past storage — coordinate round-trip, newer-wins replacement, two authors sharing a `d`, an `a`-tag tombstone that removes the project while leaving referenced `kind:30617`s intact, and a tombstone timestamped between V1 and V2 that must leave V2 live. The negative e2e case asserts on the rejection message so a refusal for an unrelated reason cannot satisfy it; that is what proves the validator is reachable from the live write path rather than merely correct in isolation. The new e2e binary is wired into the Relay E2E job. The timestamp predicate is additionally pinned at the storage layer by `coordinate_delete_spares_head_newer_than_the_deletion` in `crates/buzz-db/src/lib.rs`, which asserts both directions: a stale tombstone deletes nothing and leaves the newer head readable, and a tombstone at the head's own timestamp still deletes it. This test is wired into the Backend Integration job. Related: #3163 (the NIP-MP spec and shared conformance fixtures). Independent — either can merge first. --------- Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>