feat: validator announce #9
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Implements Task 1.6 - Validator Announce for Hyperlane Cardano. Added CLI commands: - `validator announce`: Register storage location on-chain - `validator show`: Display current validator announcements Features: - Parametrizes ValidatorAnnounce script with mailbox policy/domain - Supports creating new announcements and updating existing ones - Automatically creates seed UTXO if needed for new announcements - Dry-run mode for previewing transactions Tested on Preview Testnet: - Create: TX 46bfd2caa51902460a23369e395898ed3f247eeacc185ba081d90ab760e27a97 - Update: TX 2e792decb62913fcf571165fea245b9fb70eae8208077358757c3c47cb5b2367
The original validator announce implementation used Cardano's native ed25519 verification key hash as the validator identity. This broke cross-chain interoperability because ISMs on other chains (Ethereum, Cosmos, etc.) cannot verify ed25519 signatures - they expect secp256k1 ECDSA signatures with Ethereum addresses. Hyperlane validators must use a consistent identity across all chains so that any chain's ISM can verify their signed checkpoints. This requires using secp256k1 keys (same as Ethereum) and deriving the validator identity as a 20-byte Ethereum address. Changes: - Contract: Add ECDSA secp256k1 signature verification via CIP-49 - Contract: Validator identity is now 20-byte Ethereum address - Contract: Announcement digest matches EVM format (EIP-191) - CLI: Add --validator-key option for secp256k1 private key - CLI: Fix signing to use sign_prehash (digest is already hashed) - CLI: Separate Cardano key (tx fees) from validator key (identity) Bug fixes: - Fixed typo in announcement string: "HYPERTRNE" -> "HYPERLANE" - Fixed CLI double-hashing: sign() hashes internally, need sign_prehash() Tested on Preview testnet: - Create: TX 79484fd7e370b4ffbd0861d4b92f1b3ac68d0cad5fd87f62fa33910d4d0ca035 - Update: TX dbdd64a8b5d146c470b33dc41994f9b79f39d92205aeb9c7de7ef8eb7090834c
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Description
Drive-by changes
Related issues
Backward compatibility
Testing