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F39-NS: Yes

Rationale

NIP-01 provides live event publication and subscriptions by author key. The selected relay broadcasts accepted events internally, matches each connection subscription, and writes to that subscriber WebSocket. With the relay and applications co-resident, this is local publish/subscribe IPC; a remote subscriber uses the same author reference and subscription through its network connection.

Assessment method

Native pub/sub specification, pinned relay dispatch and host-local IP delivery

Source context

NIP-01 EVENT/REQ author subscriptions; nostr-rs-relay server.rs and subscription.rs; Linux local routes

Outstanding qualification

Yes is bounded to native relay-mediated publish/subscribe and the explicitly co-hosted relay leg. Provisioning the relay endpoint is required; applications do not encode the publishing peer physical location. Use a newly published event after subscription so the witness is live communication, not retrieval of an old stored event. No direct connection, request/reply protocol, confidentiality, exactly-once delivery, zero-copy or runtime validation is claimed. A deployment using only off-host relays does not supply this local-delivery witness.

Public sources

Editorial evidence references

The following identifiers refer to research records not included in this public package; they are not public links.