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ccfc1490e4
The app already verifies signatures in a few places: NIP-OA agent
profiles and owner attestations, Solo `me_*` records (agent inventory,
archived agents, assistants, sync), and pairing events. Each used
`nostr.Event.fromJson`'s pure-Dart BIP-340 verify, about 11.2 ms per
event on an iPhone SE (2nd gen, Profile). This routes them through
`verifiedNostrEventFromJson` and `verifySchnorrHex`, which keep the same
checks (timestamp range, canonical id, Schnorr signature) and the same
`nostr` exception types, with the signature check in libsecp256k1 (40
µs). NIP-OA owner authorizations are now signed with `signSchnorrHex`,
which removes the last pure-Dart Schnorr call in `lib`.
Incoming relay events are still not verified; that stays a separate
decision.
A native trace showed pure-Dart Schnorr verify in `me_sync` and `nip_oa`
costs 100-125 ms per foreground. This PR moves exactly those sites.
### Validation
- Added tests: the native verifier accepts a valid event and rejects
tampered content, a wrong signature, a different pubkey, malformed and
short signatures, and a zero timestamp, each also rejected by the
pure-Dart verifier. Hex Schnorr helpers are checked in both directions
against `nostr.Schnorr`.
- Focused existing validation: crypto, NIP-OA, Solo/me, pairing and
agent tests pass. `just mobile-install mobile-check mobile-test` passes
at f90823cd1.
- Device: a Profile build of the full native stack ran on an iPhone 12
mini against the internal relay.
buzz-review-completed
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Signed-off-by: Tom Brow <tomb@block.xyz>
Co-authored-by: george <973be878edd6d4f79692a3827f20a6f7fe0ed0362f269ff6b6ba8867033d7d8e@sprout-oss.stage.blox.sqprod.co>