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// SPDX-License-Identifier: CC0-1.0
pragma solidity 0.8.23;

/// @notice `ERC5564Announcer` contract to emit an `Announcement` event to broadcast information
/// about a transaction involving a stealth address. See
/// [ERC-5564](https://eips.ethereum.org/EIPS/eip-5564) to learn more.
contract ERC5564Announcer {
  /// @notice Emitted when something is sent to a stealth address.
  /// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 1 for
  /// secp256k1, as specified in ERC-5564.
  /// @param stealthAddress The computed stealth address for the recipient.
  /// @param caller The caller of the `announce` function that emitted this event.
  /// @param ephemeralPubKey Ephemeral public key used by the sender to derive the `stealthAddress`.
  /// @param metadata Arbitrary data to emit with the event. The first byte MUST be the view tag.
  /// @dev The remaining metadata can be used by the senders however they like. See
  /// [ERC-5564](https://eips.ethereum.org/EIPS/eip-5564) for recommendations on how to structure
  /// this metadata.
  event Announcement(
    uint256 indexed schemeId,
    address indexed stealthAddress,
    address indexed caller,
    bytes ephemeralPubKey,
    bytes metadata
  );

  /// @notice Called by integrators to emit an `Announcement` event.
  /// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 1 for
  /// secp256k1, as specified in ERC-5564.
  /// @param stealthAddress The computed stealth address for the recipient.
  /// @param ephemeralPubKey Ephemeral public key used by the sender.
  /// @param metadata Arbitrary data to emit with the event. The first byte MUST be the view tag.
  /// @dev The remaining metadata can be used by the senders however they like. See
  /// [ERC-5564](https://eips.ethereum.org/EIPS/eip-5564) for recommendations on how to structure
  /// this metadata.
  function announce(
    uint256 schemeId,
    address stealthAddress,
    bytes memory ephemeralPubKey,
    bytes memory metadata
  ) external {
    emit Announcement(schemeId, stealthAddress, msg.sender, ephemeralPubKey, metadata);
  }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"schemeId","type":"uint256"},{"indexed":true,"internalType":"address","name":"stealthAddress","type":"address"},{"indexed":true,"internalType":"address","name":"caller","type":"address"},{"indexed":false,"internalType":"bytes","name":"ephemeralPubKey","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"metadata","type":"bytes"}],"name":"Announcement","type":"event"},{"inputs":[{"internalType":"uint256","name":"schemeId","type":"uint256"},{"internalType":"address","name":"stealthAddress","type":"address"},{"internalType":"bytes","name":"ephemeralPubKey","type":"bytes"},{"internalType":"bytes","name":"metadata","type":"bytes"}],"name":"announce","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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