Web3

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Preservation { // public library contracts address public timeZone1Library; address public timeZone2Library; address public owner; uint256 storedTime; // Sets the function signature for delegatecall bytes4 constant setTimeSignature = bytes4(keccak256("setTime(uint256)")); constructor(address _timeZone1LibraryA..

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;import "openzeppelin-contracts-08/token/ERC20/ERC20.sol";contract NaughtCoin is ERC20 { // string public constant name = 'NaughtCoin'; // string public constant symbol = '0x0'; // uint public constant decimals = 18; uint256 public timeLock = block.timestamp + 10 * 365 days; uint256 public INITIAL_SUPPLY; address public playe..

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract GatekeeperTwo { address public entrant; modifier gateOne() { require(msg.sender != tx.origin); _; } modifier gateTwo() { uint256 x; assembly { x := extcodesize(caller()) } require(x == 0); _; } modifier gateThree(bytes8 _gateKey) { require(uint64(byt..

개인적으로 시간을 좀 많이 소비한 문제이다.// SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract GatekeeperOne { address public entrant; modifier gateOne() { require(msg.sender != tx.origin); _; } modifier gateTwo() { require(gasleft() % 8191 == 0); _; } modifier gateThree(bytes8 _gateKey) { require(uint32(uint64(_gateKey)) == uint16(uint64(_gateKey)), ..

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Privacy { bool public locked = true; uint256 public ID = block.timestamp; uint8 private flattening = 10; uint8 private denomination = 255; uint16 private awkwardness = uint16(block.timestamp); bytes32[3] private data; constructor(bytes32[3] memory _data) { data = _data; } function unlock(bytes16 _key..