Articles about my Blockchain and Software Engineering journey.
This is my last entry to my "The Ethernaut by OpenZeppelin" series of articles. I successfully completed all 27 levels using the address 0x0ec740E7d1aF47b2BD571D129EeA41992c432B3A. Luckily, I had a of help through various videos, articles and docume...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity <0.7.0; import "@openzeppelin/contracts/utils/Address.sol"; import "@openzeppelin/contracts/proxy/Initializable.sol"; contract Motorbike { // keccak-256 hash of "eip1967.proxy.imple...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; pragma experimental ABIEncoderV2; import "@openzeppelin/contracts/math/SafeMath.sol"; import "@openzeppelin/contracts/proxy/UpgradeableProxy.sol"; contract PuzzleProxy is Upgrade...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import '@openzeppelin/contracts/math/SafeMath.sol'; import '@openz...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import '@openzeppelin/contracts/math/SafeMath.sol'; import '@openz...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; interface Buyer { function price() external view returns (uint); } contract Shop { uint public price = 100; bool public isSold; function buy() public { Buyer _buyer ...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import '@openzeppelin/contracts/math/SafeMath.sol'; contract Denial { using SafeMath for uint256; address public partner; // withdrawal partner - pay the gas, split the ...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.5.0; import '../helpers/Ownable-05.sol'; contract AlienCodex is Ownable { bool public contact; bytes32[] public codex; modifier contacted() { assert(contact); _; } ...
Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; contract MagicNum { address public solver; constructor() public {} function setSolver(address _solver) public { solver = _solver; } /* ____________/\\\______...