Contract Source Code:

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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);
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

import "@openzeppelin/contracts/access/Ownable.sol";
import "contracts/interface/IMixtureBlockUpdater.sol";

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);
    }

}

// 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);
}