creation_sourcecode: // Sources flattened with hardhat v2.19.0 https://hardhat.org
  
  // SPDX-License-Identifier: MIT
  
  // File @openzeppelin/contracts/utils/Context.sol@v4.9.2
  
  // Original license: SPDX_License_Identifier: MIT
  // OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Provides information about the current execution context, including the
   * sender of the transaction and its data. While these are generally available
   * via msg.sender and msg.data, they should not be accessed in such a direct
   * manner, since when dealing with meta-transactions the account sending and
   * paying for execution may not be the actual sender (as far as an application
   * is concerned).
   *
   * This contract is only required for intermediate, library-like contracts.
   */
  abstract contract Context {
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  }
  
  
  // File @openzeppelin/contracts/access/Ownable.sol@v4.9.2
  
  // Original license: SPDX_License_Identifier: MIT
  // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Contract module which provides a basic access control mechanism, where
   * there is an account (an owner) that can be granted exclusive access to
   * specific functions.
   *
   * By default, the owner account will be the one that deploys the contract. This
   * can later be changed with {transferOwnership}.
   *
   * This module is used through inheritance. It will make available the modifier
   * `onlyOwner`, which can be applied to your functions to restrict their use to
   * the owner.
   */
  abstract contract Ownable is Context {
      address private _owner;
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      constructor() {
          _transferOwnership(_msgSender());
      }
  
      /**
       * @dev Throws if called by any account other than the owner.
       */
      modifier onlyOwner() {
          _checkOwner();
          _;
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      /**
       * @dev Throws if the sender is not the owner.
       */
      function _checkOwner() internal view virtual {
          require(owner() == _msgSender(), "Ownable: caller is not the owner");
      }
  
      /**
       * @dev Leaves the contract without owner. It will not be possible to call
       * `onlyOwner` functions. Can only be called by the current owner.
       *
       * NOTE: Renouncing ownership will leave the contract without an owner,
       * thereby disabling any functionality that is only available to the owner.
       */
      function renounceOwnership() public virtual onlyOwner {
          _transferOwnership(address(0));
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Can only be called by the current owner.
       */
      function transferOwnership(address newOwner) public virtual onlyOwner {
          require(newOwner != address(0), "Ownable: new owner is the zero address");
          _transferOwnership(newOwner);
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Internal function without access restriction.
       */
      function _transferOwnership(address newOwner) internal virtual {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  
  // File contracts/interface/IMixtureBlockUpdater.sol
  
  // Original license: SPDX_License_Identifier: MIT
  pragma solidity ^0.8.0;
  
  interface IMixtureBlockUpdater {
      event ImportBlock(uint256 identifier, bytes32 blockHash, bytes32 receiptHash);
  
      function importBlock(uint256 blockNumber,bytes32 _blockHash,bytes32 _receiptsRoot,uint256 blockConfirmation) external;
  
      function checkBlock(bytes32 _blockHash, bytes32 _receiptsRoot) external view returns (bool);
  
      function checkBlockConfirmation(bytes32 _blockHash, bytes32 _receiptsRoot) external view returns (bool, uint256);
  }
  
  
  // File contracts/block/optimistic/OptimisticBlockUpdater.sol
  
  // Original license: SPDX_License_Identifier: MIT
  
  pragma solidity ^0.8.14;
  contract OptimisticBlockUpdater is IMixtureBlockUpdater, Ownable {
  
      address public blockRouter;
  
      IMixtureBlockUpdater public oldBlockUpdater;
  
      // blockHash=>receiptsRoot =>BlockConfirmation
      mapping(bytes32 => mapping(bytes32 => uint256)) public blockInfos;
  
      modifier onlyBlockRouter() {
          require(msg.sender == blockRouter, "caller is not the block router");
          _;
      }
  
      constructor(address _blockRouter) {
          blockRouter = _blockRouter;
      }
  
      function importBlock(uint256 blockNumber, bytes32 _blockHash, bytes32 _receiptsRoot, uint256 _blockConfirmation) external onlyBlockRouter {
          (bool exist,uint256 blockConfirmation) = _checkBlock(_blockHash, _receiptsRoot);
          require(_blockConfirmation > 0, "invalid blockConfirmation");
          if (exist && _blockConfirmation <= blockConfirmation) {
              return;
          }
          blockInfos[_blockHash][_receiptsRoot] = _blockConfirmation;
          emit ImportBlock(blockNumber, _blockHash, _receiptsRoot);
      }
  
  
      function checkBlock(bytes32 _blockHash, bytes32 _receiptHash) external view returns (bool) {
          (bool exist,) = _checkBlock(_blockHash, _receiptHash);
          return exist;
      }
  
      function checkBlockConfirmation(bytes32 _blockHash, bytes32 _receiptHash) external view returns (bool, uint256) {
          return _checkBlock(_blockHash, _receiptHash);
      }
  
      function _checkBlock(bytes32 _blockHash, bytes32 _receiptHash) internal view returns (bool, uint256) {
          uint256 blockConfirmation = blockInfos[_blockHash][_receiptHash];
          if (blockConfirmation > 0) {
              return (true, blockConfirmation);
          }
          if (address(oldBlockUpdater) != address(0)) {
              return oldBlockUpdater.checkBlockConfirmation(_blockHash, _receiptHash);
          }
          return (false, 0);
      }
  
      //----------------------------------------------------------------------------------
      // onlyOwner
      function setBlockRouter(address _blockRouter) external onlyOwner {
          require(_blockRouter != address(0), "Zero address");
          blockRouter = _blockRouter;
      }
  
      function setOldBlockUpdater(address _oldBlockUpdater) external onlyOwner {
          oldBlockUpdater = IMixtureBlockUpdater(_oldBlockUpdater);
      }
  
  }