The discovery wire format that feeds the swarm's ProviderDiscovery seam: a
node announces 'I seed blake3 H from iroh endpoint E' as a signed NIP-33
addressable Nostr event. Scope is releases/catalog content ONLY (decided
2026-06-16) — never private user blobs.
- swarm/seed_advert.rs: kind 30081, d-tag = blake3 hex (one current advert
per author+hash, latest-replaces), content {"v":1,"endpoint_id":...}.
advertisement_builder / advertisement_filter / parse_endpoint_id /
endpoint_ids_from_events (dedup). Endpoint ids stay opaque strings so the
protocol is dep-light + unit-testable on the default build.
4/4 tests pass (sign->parse roundtrip, filter targeting, reject wrong-kind/
empty, dedup across nodes).
Next (task #12): gated NostrSeedDiscovery glue (query relays, parse ids ->
iroh::EndpointId), publish path, wire swarm::providers().
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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