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Follows [#8657](https://github.com/block/buzz/pull/8657) with the three optional notes from Carl's [review](https://github.com/block/buzz/pull/8657#pullrequestreview-5703482477). - **Lowercase hex only.** `verifySchnorrHex` now rejects uppercase pubkey, message and sig hex, and `verifiedNostrEventFromJson` rejects an uppercase sig, as the pure-Dart `bip340` decoder does and NIP-01 requires. (The `nostr` package already lowercases an event's pubkey when it parses one.) Before this, a key holder could publish a second, uppercase encoding of the same signature and it would verify. `_decodeSecretKey` still accepts either case. - **Bestie record.** `decodeDefaultAgent` now verifies with `verifiedNostrEventFromJson`, like the other Solo `me_*` records. - **Rejection tests.** The "other pubkey" row now recomputes the event id, so it reaches the native Schnorr check instead of failing on the id. Every row now asserts its `EventValidationReason`, a new row covers an uppercase sig, and `verifySchnorrHex` is checked with uppercase pubkey, message and sig. ## Testing - Making either lowercase pattern accept uppercase again fails the tests. - `just mobile-check mobile-test` passed on this change before it moved onto main. On main, the crypto and Solo/me tests pass. buzz-review-completed 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>