Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "contracts/interface/IBlockUpdater.sol";
import "contracts/interface/ICircuitVerifier.sol";

contract BscBlockUpdater is IBlockUpdater, Initializable, OwnableUpgradeable {
    event ImportValidator(uint256 indexed epoch, uint256 indexed blockNumber, bytes32 blockHash, bytes32 receiptHash);
    event ModBlockConfirmation(uint256 oldBlockConfirmation, uint256 newBlockConfirmation);

    struct ParsedInput {
        uint256 blockNumber;
        uint256 epochValidatorCount;
        uint256 blockConfirmation;
        bytes32 blockHash;
        bytes32 receiptHash;
        bytes32 signingValidatorSetHash;
        bytes32 epochValidatorSetHash;
    }

    struct ZkProof {
        uint256[2] a;
        uint256[2][2] b;
        uint256[2] c;
        uint256[] inputs;
    }

    uint256 public currentEpoch;

    uint256 public minBlockConfirmation;

    uint256 public regularValidatorCount;

    uint256 public publicInputSize;

    IBlockUpdater public oldBlockUpdater;

    mapping(uint256 => ICircuitVerifier) public blockVerifier;

    // epoch=>validatorHash
    mapping(uint256 => bytes32) public validatorHashes;

    // epoch=>validatorCount
    mapping(uint256 => uint256) private validatorCounts;

    // blockHash=>receiptsRoot =>BlockConfirmation
    mapping(bytes32 => mapping(bytes32 => uint256)) public blockInfos;


    function initialize(
        uint256 _epoch,
        uint256 _validatorCount,
        uint256 _preValidatorCount,
        bytes32 _epochValidatorSetHash,
        bytes32 _preEpochValidatorSetHash,
        bytes32 _blockHash,
        bytes32 _receiptHash,
        uint256 _minBlockConfirmation,
        uint256 _regularValidatorCount) public initializer {
        __Ownable_init();
        currentEpoch = _epoch;
        validatorHashes[_epoch] = _epochValidatorSetHash;
        validatorHashes[_epoch - 1] = _preEpochValidatorSetHash;
        validatorCounts[_epoch] = _validatorCount;
        _setValidatorCount(_epoch, _validatorCount);
        _setValidatorCount(_epoch - 1, _preValidatorCount);
        blockInfos[_blockHash][_receiptHash] = _minBlockConfirmation;
        minBlockConfirmation = _minBlockConfirmation;
        regularValidatorCount = _regularValidatorCount;
        publicInputSize = 11;
    }

    function importBlock(bytes calldata _proof) external {
        ZkProof memory proofData;
        (proofData.a, proofData.b, proofData.c, proofData.inputs) = abi.decode(_proof, (uint256[2], uint256[2][2], uint256[2], uint256[]));

        uint256 blockSize = proofData.inputs.length / publicInputSize;
        require(blockSize * publicInputSize == proofData.inputs.length, "invalid public input size");

        ICircuitVerifier circuitVerifier = blockVerifier[blockSize];
        require(address(circuitVerifier) != address(0), "not set verifier");

        uint256[1] memory compressInput;
        compressInput[0] = _hashInput(proofData.inputs);
        require(circuitVerifier.verifyProof(proofData.a, proofData.b, proofData.c, compressInput), "invalid proof");

        ParsedInput[] memory parsedInputs = _parseInput(proofData.inputs, blockSize);
        for (uint256 i = 0; i < blockSize; i++) {
            if (i > 0 && parsedInputs[i].blockHash == parsedInputs[i - 1].blockHash) {
                break;
            }
            if (parsedInputs[i].blockNumber % 200 == 0) {
                _importValidator(parsedInputs[i]);
            } else {
                _importBlock(parsedInputs[i]);
            }
        }
    }

    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);
    }

    function _importBlock(ParsedInput memory parsedInput) internal {
        require(parsedInput.blockConfirmation >= minBlockConfirmation, "Not enough block confirmations");
        (bool exist,uint256 blockConfirmation) = _checkBlock(parsedInput.blockHash, parsedInput.receiptHash);
        if (exist && parsedInput.blockConfirmation <= blockConfirmation) {
            revert("already exist");
        }
        uint256 epoch = _computeEpoch(parsedInput.blockNumber);
        uint256 preEpoch = epoch - 1;
        require(validatorHashes[epoch] != bytes32(0), "epoch no upload");

        if (parsedInput.blockNumber % 200 <= getValidatorCount(preEpoch) / 2) {
            require(parsedInput.signingValidatorSetHash == validatorHashes[preEpoch], "invalid preEpochValidatorSetHash");
        } else {
            require(parsedInput.signingValidatorSetHash == validatorHashes[epoch], "invalid epochValidatorSetHash");
        }
        blockInfos[parsedInput.blockHash][parsedInput.receiptHash] = parsedInput.blockConfirmation;
        emit ImportBlock(parsedInput.blockNumber, parsedInput.blockHash, parsedInput.receiptHash);
    }

    function _importValidator(ParsedInput memory parsedInput) internal {
        uint256 epoch = _computeEpoch(parsedInput.blockNumber);
        uint256 preEpoch = epoch - 1;
        require(parsedInput.epochValidatorSetHash != bytes32(0), "invalid epochValidatorSetHash");
        require(parsedInput.signingValidatorSetHash != bytes32(0), "invalid signingValidatorSetHash");
        require(parsedInput.blockConfirmation >= minBlockConfirmation, "Not enough block confirmations");
        require(validatorHashes[epoch] == bytes32(0), "epoch already exist");
        require(parsedInput.signingValidatorSetHash == validatorHashes[preEpoch], "invalid preEpochValidatorSetHash");

        validatorHashes[epoch] = parsedInput.epochValidatorSetHash;
        _setValidatorCount(epoch, parsedInput.epochValidatorCount);
        currentEpoch = epoch;
        blockInfos[parsedInput.blockHash][parsedInput.receiptHash] = parsedInput.blockConfirmation;
        emit ImportValidator(epoch, parsedInput.blockNumber, parsedInput.blockHash, parsedInput.receiptHash);
    }

    function _setValidatorCount(uint256 _epoch, uint256 _validatorCount) internal {
        if (_validatorCount != regularValidatorCount) {
            validatorCounts[_epoch] = _validatorCount;
        }
    }

    function getValidatorCount(uint256 _epoch) public view returns (uint256) {
        if (validatorCounts[_epoch] != 0) {
            return validatorCounts[_epoch];
        }
        return regularValidatorCount;
    }

    function _parseInput(uint256[] memory _inputs, uint256 _blockSize) internal pure returns (ParsedInput[] memory)    {
        uint256 index = 0;
        ParsedInput[] memory result = new ParsedInput[](_blockSize);
        for (uint256 i = 0; i < _blockSize; i++) {
            result[i].blockNumber = _inputs[index];
            index++;
            result[i].blockHash = bytes32((_inputs[index + 1] << 128) | _inputs[index]);
            index += 2;
            result[i].receiptHash = bytes32((_inputs[index + 1] << 128) | _inputs[index]);
            index += 2;
            result[i].signingValidatorSetHash = bytes32((_inputs[index + 1] << 128) | _inputs[index]);
            index += 2;
            result[i].epochValidatorSetHash = bytes32((_inputs[index + 1] << 128) | _inputs[index]);
            index += 2;
            result[i].epochValidatorCount = _inputs[index];
            index++;
            result[i].blockConfirmation = _inputs[index];
            index++;
        }
        return result;
    }

    function _hashInput(uint256[] memory _inputs) internal pure returns (uint256) {
        uint256 n = _inputs.length;
        uint256 inputLength = n * 32;
        bytes memory packedInputs;
        assembly {
            packedInputs := mload(0x40) // Get the free memory pointer
            mstore(0x40, add(packedInputs, add(inputLength, 0x20))) // Update the free memory pointer

            let inputOffset := packedInputs
            mstore(inputOffset, inputLength) // Store the length of the concatenated inputs
            inputOffset := add(inputOffset, 0x20) // Move the pointer to the start of the concatenated inputs

            for {let i := 0} lt(i, n) {i := add(i, 1)} {
                let inputValue := mload(add(_inputs, mul(add(i, 1), 0x20))) // Load the input value
                mstore(inputOffset, inputValue) // Store the input value at the current offset
                inputOffset := add(inputOffset, 0x20) // Move the pointer to the next position
            }
        }
        uint256 computedHash = uint256(keccak256(packedInputs));
        return computedHash / 256;
    }

    function _computeEpoch(uint256 _blockNumber) internal pure returns (uint256) {
        return _blockNumber / 200;
    }

    //----------------------------------------------------------------------------------
    // onlyOwner
    function setBlockConfirmation(uint256 _minBlockConfirmation) external onlyOwner {
        emit ModBlockConfirmation(minBlockConfirmation, _minBlockConfirmation);
        minBlockConfirmation = _minBlockConfirmation;
    }

    function setOldBlockUpdater(address _oldBlockUpdater) external onlyOwner {
        oldBlockUpdater = IBlockUpdater(_oldBlockUpdater);
    }

    function setPublicInputSize(uint256 _publicInputSize) external onlyOwner {
        publicInputSize = _publicInputSize;
    }

    function setVerifier(uint256 _blockSize, address _blockVerifier) external onlyOwner {
        blockVerifier[_blockSize] = ICircuitVerifier(_blockVerifier);
    }
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBlockUpdater {
    event ImportBlock(uint256 identifier, bytes32 blockHash, bytes32 receiptHash);

    function importBlock(bytes calldata _proof) external;

    function checkBlock(bytes32 _blockHash, bytes32 _receiptsRoot) external view returns (bool);

    function checkBlockConfirmation(bytes32 _blockHash, bytes32 _receiptsRoot) external view returns (bool, uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;


interface ICircuitVerifier {
    function verifyProof(
        uint256[2] memory a,
        uint256[2][2] memory b,
        uint256[2] memory c,
        uint256[1] memory input
    ) external view returns (bool);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"identifier","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"blockHash","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"receiptHash","type":"bytes32"}],"name":"ImportBlock","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"blockNumber","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"blockHash","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"receiptHash","type":"bytes32"}],"name":"ImportValidator","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldBlockConfirmation","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newBlockConfirmation","type":"uint256"}],"name":"ModBlockConfirmation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"blockInfos","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"blockVerifier","outputs":[{"internalType":"contract ICircuitVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"bytes32","name":"_receiptHash","type":"bytes32"}],"name":"checkBlock","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"bytes32","name":"_receiptHash","type":"bytes32"}],"name":"checkBlockConfirmation","outputs":[{"internalType":"bool","name":"","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentEpoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_epoch","type":"uint256"}],"name":"getValidatorCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_proof","type":"bytes"}],"name":"importBlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_epoch","type":"uint256"},{"internalType":"uint256","name":"_validatorCount","type":"uint256"},{"internalType":"uint256","name":"_preValidatorCount","type":"uint256"},{"internalType":"bytes32","name":"_epochValidatorSetHash","type":"bytes32"},{"internalType":"bytes32","name":"_preEpochValidatorSetHash","type":"bytes32"},{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"bytes32","name":"_receiptHash","type":"bytes32"},{"internalType":"uint256","name":"_minBlockConfirmation","type":"uint256"},{"internalType":"uint256","name":"_regularValidatorCount","type":"uint256"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minBlockConfirmation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oldBlockUpdater","outputs":[{"internalType":"contract IBlockUpdater","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"publicInputSize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"regularValidatorCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minBlockConfirmation","type":"uint256"}],"name":"setBlockConfirmation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_oldBlockUpdater","type":"address"}],"name":"setOldBlockUpdater","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_publicInputSize","type":"uint256"}],"name":"setPublicInputSize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_blockSize","type":"uint256"},{"internalType":"address","name":"_blockVerifier","type":"address"}],"name":"setVerifier","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"validatorHashes","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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