All [SPECULATIVE] markers replaced with [CONFIRMED] from actual WZP code.
Key discoveries:
- HKDF info string mismatch: featherChat uses "warzone-ed25519",
WZP uses "warzone-ed25519-identity" — same seed, different keys.
Requires 2-line fix in wzp-crypto/src/handshake.rs before integration.
- Media is NOT DTLS-SRTP: WZP uses ephemeral X25519 DH + ChaCha20-Poly1305
with deterministic nonces (WireGuard-like, not WebRTC-like)
- Transport is QUIC (quinn), not WebRTC/ICE
- FEC is RaptorQ fountain codes, not Opus inband
- 5 codecs: Opus 24k → Codec2 1200bps with adaptive switching
- Relay operates on encrypted packets (zero-knowledge relay)
18 sections with concrete API contracts, code file:line references,
and phased implementation roadmap.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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