Dorian b1e54e3626 feat: Phase 4 — mesh authentication, envelope signature verification, TX validation
- Identity announcements: verify Ed25519 key validity and X25519 consistency
- Envelope signatures: verify Ed25519 signatures on signed messages, drop invalid
- Block header validation: height range, hash length, timestamp sanity checks
- TX relay validation: hex validity, size bounds, version check before broadcast
- Rate limiter struct for per-peer relay operations
- Message sequence number field (seq) added to TypedEnvelope for ordering

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-18 00:49:38 +00:00
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