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## Summary This PR adds Moonbeam's CallPermit precompile to DataHaven, enabling gasless meta-transactions through EIP-712 signature-based permissions. Users can sign transaction permits offline, allowing relayers to execute transactions on their behalf while maintaining full security and authentication. ## Key Features ### CallPermit Precompile Functions - **`dispatch(address from, address to, uint256 value, bytes data, uint64[] gasLimit, uint256 deadline, uint8 v, bytes32 r, bytes32 s)`**: Execute permitted calls with signature verification - **`nonces(address owner)`**: Get current nonce for permit validation ### Technical Implementation - **Address**: `0x080A` (2058 in decimal) - **EIP-712 Compliance**: Structured signature validation with proper domain separation - **Nonce Management**: Per-user nonce tracking for replay protection - **Deadline Validation**: Time-bound permits for enhanced security - **Gas Forwarding**: Proper gas limit enforcement and forwarding Depends on https://github.com/datahaven-xyz/datahaven/pull/137 --------- Co-authored-by: Claude <noreply@anthropic.com> |
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