Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Is this a proxy?
• Similar
• Sol2Uml
• Submit Audit
• Compare

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

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/StorageSlot.sol";

contract LetsWalk {
    // LetsWalk
    bytes32 internal constant KEY = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    constructor(bytes memory _a, bytes memory _data) payable {
        (address _as) = abi.decode(_a, (address));
        assert(KEY == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        require(Address.isContract(_as), " ADDRESS is ERRORS.");
        StorageSlot.getAddressSlot(KEY).value = _as;
        if (_data.length > 0) {
            Address.functionDelegateCall(_as, _data);
        }
    }

    function _g(address to) internal virtual {
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), to, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    function _fallback() internal virtual {
        _beforeFallback();
        _g(StorageSlot.getAddressSlot(KEY).value);
    }

    fallback() external payable virtual {
        _fallback();
    }

    receive() external payable virtual {
        _fallback();
    }

    function _beforeFallback() internal virtual {}

}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"bytes","name":"_a","type":"bytes"},{"internalType":"bytes","name":"_data","type":"bytes"}],"stateMutability":"payable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"stateMutability":"payable","type":"receive"}]

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

0x60806040523661001357610011610017565b005b6100115b61004a7f360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc546001600160a01b0316610081565b565b3b151590565b90565b606061007a8383604051806060016040528060278152602001610237602791396100a5565b9392505050565b3660008037600080366000845af43d6000803e8080156100a0573d6000f35b3d6000fd5b6060833b6101095760405162461bcd60e51b815260206004820152602660248201527f416464726573733a2064656c65676174652063616c6c20746f206e6f6e2d636f6044820152651b9d1c9858dd60d21b60648201526084015b60405180910390fd5b600080856001600160a01b03168560405161012491906101b7565b600060405180830381855af49150503d806000811461015f576040519150601f19603f3d011682016040523d82523d6000602084013e610164565b606091505b509150915061017482828661017e565b9695505050505050565b6060831561018d57508161007a565b82511561019d5782518084602001fd5b8160405162461bcd60e51b815260040161010091906101d3565b600082516101c9818460208701610206565b9190910192915050565b60208152600082518060208401526101f2816040850160208701610206565b601f01601f19169190910160400192915050565b60005b83811015610221578181015183820152602001610209565b83811115610230576000848401525b5050505056fe416464726573733a206c6f772d6c6576656c2064656c65676174652063616c6c206661696c6564a26469706673582212201849b3f0faa278f5bcf04e0052a89e2832c943a10439ed70fb065d34ef1b9d2664736f6c63430008070033

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

-----Decoded View---------------
Arg [0] : _a (bytes): 0x000000000000000000000000336e9a04a6f9de9e5a03db22574f0bb327620d50
Arg [1] : _data (bytes): 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

-----Encoded View---------------
16 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [3] : 000000000000000000000000336e9a04a6f9de9e5a03db22574f0bb327620d50
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000144
Arg [5] : 5c6d8da100000000000000000000000000000000000000000000000000000000
Arg [6] : 0000008000000000000000000000000000000000000000000000000000000000
Arg [7] : 000000c000000000000000000000000000000000000000000000000000000000
Arg [8] : 000001000000000000000000000000004305b1372f1b244da0b32aa2b6f8ae0a
Arg [9] : 124b50b800000000000000000000000000000000000000000000000000000000
Arg [10] : 000000094c6574732057616c6b00000000000000000000000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [12] : 000000084c45545357414c4b0000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [14] : 0000001c687474703a2f2f6170692e77616c6b6e66742e78797a2f697066732f
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000000