ISingleMessageDispatcher.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.16;

import "./IMessageDispatcher.sol";

/**
 * @title ERC-5164: Cross-Chain Execution Standard, optional SingleMessageDispatcher extension
 * @dev See https://eips.ethereum.org/EIPS/eip-5164
 */
interface ISingleMessageDispatcher is IMessageDispatcher {
  /**
   * @notice Dispatch a message to the receiving chain.
   * @dev Must compute and return an ID uniquely identifying the message.
   * @dev Must emit the `MessageDispatched` event when successfully dispatched.
   * @param toChainId ID of the receiving chain
   * @param to Address on the receiving chain that will receive `data`
   * @param data Data dispatched to the receiving chain
   * @return bytes32 ID uniquely identifying the message
   */
  function dispatchMessage(
    uint256 toChainId,
    address to,
    bytes calldata data
  ) external returns (bytes32);
}