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Execute Transact... | 15870210 | 783 days ago | IN | 0 ETH | 0.00088841 | ||||
Execute Transact... | 15409564 | 851 days ago | IN | 0 ETH | 0.0031438 | ||||
Execute Transact... | 15409529 | 851 days ago | IN | 0 ETH | 0.00237736 | ||||
Execute Transact... | 15400524 | 852 days ago | IN | 0 ETH | 0.00217138 | ||||
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Execute Transact... | 15400449 | 852 days ago | IN | 0 ETH | 0.00232973 | ||||
Execute Transact... | 15400446 | 852 days ago | IN | 0 ETH | 0.00239565 | ||||
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Transfer | 15400417 | 852 days ago | IN | 0.61873147 ETH | 0.00123953 |
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Contract Name:
MultiSigWallet
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; // never forget the OG simple sig wallet: https://github.com/christianlundkvist/simple-multisig/blob/master/contracts/SimpleMultiSig.sol pragma experimental ABIEncoderV2; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import "./MultiSigFactory.sol"; //custom errors error DUPLICATE_OR_UNORDERED_SIGNATURES(); error INVALID_OWNER(); error INVALID_SIGNER(); error INVALID_SIGNATURES_REQUIRED(); error INSUFFICIENT_VALID_SIGNATURES(); error NOT_ENOUGH_SIGNERS(); error NOT_OWNER(); error NOT_SELF(); error NOT_FACTORY(); error TX_FAILED(); contract MultiSigWallet { using ECDSA for bytes32; MultiSigFactory private multiSigFactory; uint256 public constant factoryVersion = 1; // <---- set the factory version for backword compatiblity for future contract updates event Deposit(address indexed sender, uint256 amount, uint256 balance); event ExecuteTransaction( address indexed owner, address payable to, uint256 value, bytes data, uint256 nonce, bytes32 hash, bytes result ); event Owner(address indexed owner, bool added); mapping(address => bool) public isOwner; address[] public owners; uint256 public signaturesRequired; uint256 public nonce; uint256 public chainId; string public name; modifier onlyOwner() { if (!isOwner[msg.sender]) { revert NOT_OWNER(); } _; } modifier onlySelf() { if (msg.sender != address(this)) { revert NOT_SELF(); } _; } modifier onlyValidSignaturesRequired() { _; if (signaturesRequired == 0) { revert INVALID_SIGNATURES_REQUIRED(); } if (owners.length < signaturesRequired) { revert NOT_ENOUGH_SIGNERS(); } } modifier onlyFactory() { if (msg.sender != address(multiSigFactory)) { revert NOT_FACTORY(); } _; } constructor(string memory _name, address _factory) payable { name = _name; multiSigFactory = MultiSigFactory(_factory); } function init( uint256 _chainId, address[] calldata _owners, uint256 _signaturesRequired ) public payable onlyFactory onlyValidSignaturesRequired { signaturesRequired = _signaturesRequired; for (uint256 i = 0; i < _owners.length; ) { address owner = _owners[i]; if (owner == address(0) || isOwner[owner]) { revert INVALID_OWNER(); } isOwner[owner] = true; owners.push(owner); emit Owner(owner, isOwner[owner]); unchecked { ++i; } } chainId = _chainId; } function addSigner(address newSigner, uint256 newSignaturesRequired) public onlySelf onlyValidSignaturesRequired { if (newSigner == address(0) || isOwner[newSigner]) { revert INVALID_SIGNER(); } isOwner[newSigner] = true; owners.push(newSigner); signaturesRequired = newSignaturesRequired; emit Owner(newSigner, isOwner[newSigner]); multiSigFactory.emitOwners( address(this), owners, newSignaturesRequired ); } function removeSigner(address oldSigner, uint256 newSignaturesRequired) public onlySelf onlyValidSignaturesRequired { if (!isOwner[oldSigner]) { revert NOT_OWNER(); } _removeOwner(oldSigner); signaturesRequired = newSignaturesRequired; emit Owner(oldSigner, isOwner[oldSigner]); multiSigFactory.emitOwners( address(this), owners, newSignaturesRequired ); } function _removeOwner(address _oldSigner) private { isOwner[_oldSigner] = false; uint256 ownersLength = owners.length; address[] memory poppedOwners = new address[](owners.length); for (uint256 i = ownersLength - 1; i >= 0; ) { if (owners[i] != _oldSigner) { poppedOwners[i] = owners[i]; owners.pop(); } else { owners.pop(); for (uint256 j = i; j < ownersLength - 1; ) { owners.push(poppedOwners[j + 1]); // shout out to moltam89!! https://github.com/austintgriffith/maas/pull/2/commits/e981c5fa5b4d25a1f0946471b876f9a002a9a82b unchecked { ++j; } } return; } unchecked { --i; } } } function updateSignaturesRequired(uint256 newSignaturesRequired) public onlySelf onlyValidSignaturesRequired { signaturesRequired = newSignaturesRequired; } function executeTransaction( address payable to, uint256 value, bytes calldata data, bytes[] calldata signatures ) public onlyOwner returns (bytes memory) { bytes32 _hash = getTransactionHash(nonce, to, value, data); nonce++; uint256 validSignatures; address duplicateGuard; for (uint256 i = 0; i < signatures.length; ) { address recovered = recover(_hash, signatures[i]); if (recovered <= duplicateGuard) { revert DUPLICATE_OR_UNORDERED_SIGNATURES(); } duplicateGuard = recovered; if (isOwner[recovered]) { validSignatures++; } unchecked { ++i; } } if (validSignatures < signaturesRequired) { revert INSUFFICIENT_VALID_SIGNATURES(); } (bool success, bytes memory result) = to.call{value: value}(data); if (!success) { revert TX_FAILED(); } emit ExecuteTransaction( msg.sender, to, value, data, nonce - 1, _hash, result ); return result; } function getTransactionHash( uint256 _nonce, address to, uint256 value, bytes calldata data ) public view returns (bytes32) { return keccak256( abi.encodePacked( address(this), chainId, _nonce, to, value, data ) ); } function recover(bytes32 _hash, bytes calldata _signature) public pure returns (address) { return _hash.toEthSignedMessageHash().recover(_signature); } receive() external payable { emit Deposit(msg.sender, msg.value, address(this).balance); } function numberOfOwners() public view returns (uint256) { return owners.length; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0 <0.9.0; // import "hardhat/console.sol"; import "@openzeppelin/contracts/utils/Create2.sol"; import "./MultiSigWallet.sol"; //custom errors error CALLER_NOT_REGISTERED(); contract MultiSigFactory { MultiSigWallet[] public multiSigs; mapping(address => bool) existsMultiSig; event Create2Event( uint256 indexed contractId, string name, address indexed contractAddress, address creator, address[] owners, uint256 signaturesRequired ); event Owners( address indexed contractAddress, address[] owners, uint256 indexed signaturesRequired ); modifier onlyRegistered() { if (!existsMultiSig[msg.sender]) { revert CALLER_NOT_REGISTERED(); } _; } function emitOwners( address _contractAddress, address[] calldata _owners, uint256 _signaturesRequired ) external onlyRegistered { emit Owners(_contractAddress, _owners, _signaturesRequired); } function numberOfMultiSigs() public view returns (uint256) { return multiSigs.length; } function getMultiSig(uint256 _index) public view returns ( address multiSigAddress, uint256 signaturesRequired, uint256 balance ) { MultiSigWallet multiSig = multiSigs[_index]; return ( address(multiSig), multiSig.signaturesRequired(), address(multiSig).balance ); } function create2( uint256 _chainId, address[] calldata _owners, uint256 _signaturesRequired, string calldata _name ) public payable { uint256 id = numberOfMultiSigs(); bytes32 _salt = keccak256( abi.encodePacked(abi.encode(_name, address(msg.sender))) ); /**---------------------- * create2 implementation * ---------------------*/ address multiSig_address = payable( Create2.deploy( msg.value, _salt, abi.encodePacked( type(MultiSigWallet).creationCode, abi.encode(_name, address(this)) ) ) ); MultiSigWallet multiSig = MultiSigWallet(payable(multiSig_address)); /**---------------------- * init remaining values * ---------------------*/ multiSig.init(_chainId, _owners, _signaturesRequired); multiSigs.push(multiSig); existsMultiSig[address(multiSig_address)] = true; emit Create2Event( id, _name, address(multiSig), msg.sender, _owners, _signaturesRequired ); emit Owners(address(multiSig), _owners, _signaturesRequired); } /**---------------------- * get a pre-computed address * ---------------------*/ function computedAddress(string calldata _name) public view returns (address) { bytes32 bytecodeHash = keccak256( abi.encodePacked( type(MultiSigWallet).creationCode, abi.encode(_name, address(this)) ) ); bytes32 _salt = keccak256( abi.encodePacked(abi.encode(_name, address(msg.sender))) ); address computed_address = Create2.computeAddress(_salt, bytecodeHash); return computed_address; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Create2.sol) pragma solidity ^0.8.0; /** * @dev Helper to make usage of the `CREATE2` EVM opcode easier and safer. * `CREATE2` can be used to compute in advance the address where a smart * contract will be deployed, which allows for interesting new mechanisms known * as 'counterfactual interactions'. * * See the https://eips.ethereum.org/EIPS/eip-1014#motivation[EIP] for more * information. */ library Create2 { /** * @dev Deploys a contract using `CREATE2`. The address where the contract * will be deployed can be known in advance via {computeAddress}. * * The bytecode for a contract can be obtained from Solidity with * `type(contractName).creationCode`. * * Requirements: * * - `bytecode` must not be empty. * - `salt` must have not been used for `bytecode` already. * - the factory must have a balance of at least `amount`. * - if `amount` is non-zero, `bytecode` must have a `payable` constructor. */ function deploy( uint256 amount, bytes32 salt, bytes memory bytecode ) internal returns (address) { address addr; require(address(this).balance >= amount, "Create2: insufficient balance"); require(bytecode.length != 0, "Create2: bytecode length is zero"); assembly { addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt) } require(addr != address(0), "Create2: Failed on deploy"); return addr; } /** * @dev Returns the address where a contract will be stored if deployed via {deploy}. Any change in the * `bytecodeHash` or `salt` will result in a new destination address. */ function computeAddress(bytes32 salt, bytes32 bytecodeHash) internal view returns (address) { return computeAddress(salt, bytecodeHash, address(this)); } /** * @dev Returns the address where a contract will be stored if deployed via {deploy} from a contract located at * `deployer`. If `deployer` is this contract's address, returns the same value as {computeAddress}. */ function computeAddress( bytes32 salt, bytes32 bytecodeHash, address deployer ) internal pure returns (address) { bytes32 _data = keccak256(abi.encodePacked(bytes1(0xff), deployer, salt, bytecodeHash)); return address(uint160(uint256(_data))); } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
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payable","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes[]","name":"signatures","type":"bytes[]"}],"name":"executeTransaction","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"factoryVersion","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nonce","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"getTransactionHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_chainId","type":"uint256"},{"internalType":"address[]","name":"_owners","type":"address[]"},{"internalType":"uint256","name":"_signaturesRequired","type":"uint256"}],"name":"init","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"numberOfOwners","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"owners","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_hash","type":"bytes32"},{"internalType":"bytes","name":"_signature","type":"bytes"}],"name":"recover","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"oldSigner","type":"address"},{"internalType":"uint256","name":"newSignaturesRequired","type":"uint256"}],"name":"removeSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signaturesRequired","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newSignaturesRequired","type":"uint256"}],"name":"updateSignaturesRequired","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000000000000000000000000000000000000000000400000000000000000000000003e14373efbcbd5be16f6f1634175192ddb127d75000000000000000000000000000000000000000000000000000000000000000c70756e6b20686f6c737465720000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): punk holster
Arg [1] : _factory (address): 0x3E14373EFBcbd5bE16F6f1634175192dDb127D75
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000003e14373efbcbd5be16f6f1634175192ddb127d75
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [3] : 70756e6b20686f6c737465720000000000000000000000000000000000000000
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.