hns-chat-protocol

Runtime-independent protocol values for owner-bound HNS Chat.

This crate parses the authenticated hnschat resource binding, proves its x-only secp256k1 key against the current standard single-key Handshake owner output without assuming a public-key parity, supplies the owner-bound profile's authority adapter for the HIP-compliant HNSA service name chat, and encodes bounded opaque NIP-59 gift-wrap and encrypted-acknowledgement payloads for HIP-78 transport. The dotted hns.chat label belongs only to the HNSR profile registry layer.

The public boundary includes the canonical wire version, payload and exact encoded-size limits, validation for programmatically constructed values, and the owner-binding proof types used by downstream nodes and wallets. The versioned valid/invalid release vectors and SHA-256 sidecar under fixtures/chat-v1/ are included in the normalized crate source package along with an external-consumer integration test.

It does not own wallets, private keys, Nostr signing, NIP-44 conversation keys, storage, networking, or browser APIs. In particular, it never creates a second long-term chat identity.

Status: source implemented for standard version-zero single-key owner outputs, but unreleased and not qualified for a deployed mailbox or mainnet use. See the repository release and owner-identity documents for the remaining gates.