661de47552
Protocol (ethereum.rs): - derive_eth_identity(): HKDF from seed (info="warzone-secp256k1") - secp256k1 signing key (k256 crate) - Ethereum address: Keccak-256(uncompressed_pubkey[1..])[-20:] - EIP-55 checksum address formatting - eth_sign() / eth_verify() for secp256k1 ECDSA - EthAddress type with Display, hex parsing, checksum - 5 tests: deterministic, format, checksum, sign/verify, uniqueness CLI: - `warzone eth` — show Ethereum address alongside Warzone fingerprint - Same seed produces both identities (dual-curve) Dual identity model: - Ed25519 + X25519 for Warzone messaging (fast, small signatures) - secp256k1 for Ethereum compatibility (MetaMask, ENS, Ledger/Trezor) - Both derived from the same BIP39 seed via different HKDF paths 28/28 protocol tests pass. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>