Jan 6Smart Contract Security VulnerabilitiesSmart contract security is an important domain for people in the web3 space because a single hack to your launched product can lose millions of dollars. It also has lucrative opportunities if you follow the space. …Smart Contract Security7 min readSmart Contract Security7 min read
Jan 4Damn Vulnerable Defi — Challenge #1 — UnstoppableThis introductory challenge introduces you to the Damn Vulnerable Defi platform. Let’s get into it! Go to the main website here and follow the How to Play instructions. On your PC, after you have cloned the repo and can see the folders, head to contracts → unstoppable → UnstoppableLender.sol. On…Damn Vulnerable Defi2 min readDamn Vulnerable Defi2 min read
Jan 1#17 — Ethernaut Challenge 17— RecoveryObjective: This level will be completed if you can recover (or remove) the 0.001 ether from the lost contract address. Note: The solution mentioned in this blog post is majorly inspired from the solution by Web3 Blockchain Developer so that you can find the video format of this solution here on…Smart Contract Security2 min readSmart Contract Security2 min read
Jan 1#16 — Ethernaut Challenge 16 — PreservationObjective: The goal of this level is for you to claim ownership of the instance you are given. Understanding the code: // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract Preservation { // public library contracts address public timeZone1Library; address public timeZone2Library; address public owner; uint storedTime; // Sets the…Solidity3 min readSolidity3 min read
Jan 1#15 — Ethernaut Challenge 15 — Naught CoinObjective: Complete this level by getting your token balance to 0. Understanding the Code: // SPDX-License-Identifier: MIT pragma 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; uint public timeLock =…Solidity2 min readSolidity2 min read
Jan 1#14 - Ethernaut Challenge 14 - Gatekeeper TwoObjective: Make it past the gatekeeper and register as an entrant to pass this level. Understanding the code: // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract GatekeeperTwo { address public entrant; modifier gateOne() { require(msg.sender != tx.origin); _; } modifier gateTwo() { uint x…Solidity3 min readSolidity3 min read
Dec 31, 2022#12 — Ethernaut Challenge 12— PrivacyObjective: Unlock this contract to beat the level. Understanding the code: // SPDX-License-Identifier: MIT pragma 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]…Solidity3 min readSolidity3 min read
Dec 29, 2022#10— Ethernaut Challenge 10— ReentrancyObjective: The goal of this level is for you to steal all the funds from the contract. Understanding the code: // SPDX-License-Identifier: MIT pragma solidity ^0.6.12; import 'openzeppelin-contracts-06/math/SafeMath.sol'; contract Reentrance { using SafeMath for uint256; mapping(address => uint) public balances; function donate(address _to) public payable { balances[_to] = balances[_to].add(msg.value)…Solidity3 min readSolidity3 min read
Dec 29, 2022#9 — Ethernaut Challenge 9 — KingObjective: Send the contract an amount of ether larger than the current prize to become the new king. Understanding the code: // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract King { address king; uint public prize; address public owner; constructor() payable { owner = msg.sender…Solidity3 min readSolidity3 min read
Published in Coinmonks·Dec 28, 2022#8 — Ethernaut Challenge 8— VaultObjectives of the challenge: Unlock the vault to pass the level Understanding the code: // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract Vault { bool public locked; bytes32 private password; constructor(bytes32 _password) { locked = true; password = _password; } function unlock(bytes32 _password) public { if (password == _password) { locked = false; } } }Solidity2 min readSolidity2 min read
