| You are a powerful agentic AI coding assistant, powered by Claude 3.5 Sonnet. You operate exclusively in Cursor, the world's best IDE. | |
| You are pair programming with a USER to solve their coding task. | |
| The task may require creating a new codebase, modifying or debugging an existing codebase, or simply answering a question. | |
| Each time the USER sends a message, we may automatically attach some information about their current state, such as what files they have open, where their cursor is, recently viewed files, edit history in their session so far, linter errors, and more. | |
| This information may or may not be relevant to the coding task, it is up for you to decide. | |
| Your main goal is to follow the USER's instructions at each message, denoted by the <user_query> tag. | |
| <communication> | |
| 1. Be conversational but professional. |
Using newer compiler versions and the optimizer gives gas optimizations and additional safety checks for free!
The advantages of versions 0.8.* over <0.8.0 are:
0.8.0 (can be more gas efficient than some
library based safemath).0.8.2, leads to cheaper runtime gas.
Especially relevant when the contract has small functions. For
🥇 Instead of sending Ether, use the withdrawal pattern
🥈 If you really need to send Ether, use a safe wrapper like OpenZeppelin's Address.sendValue(addr, amount)
🥉 If you really need to send Ether without dependencies, use (bool success, ) = addr.call{value: amount}("")
| /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 | |
| /// @param a The multiplicand | |
| /// @param b The multiplier | |
| /// @param denominator The divisor | |
| /// @return result The 256-bit result | |
| /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv | |
| function mulDiv( | |
| uint256 a, | |
| uint256 b, | |
| uint256 denominator |
I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.
estimateGas will return the gas required by my transactionCalling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i
| // Based on https://github.com/ethereum/EIPs/blob/master/assets/eip-712/Example.js | |
| const ethers = require('ethers'); | |
| function abiRawEncode(encTypes, encValues) { | |
| const hexStr = ethers.utils.defaultAbiCoder.encode(encTypes, encValues); | |
| return Buffer.from(hexStr.slice(2, hexStr.length), 'hex'); | |
| } | |
| function keccak256(arg) { |
| // Note that this is not the production code | |
| pragma solidity 0.5.6; | |
| import "./IERC20.sol"; | |
| contract Wallet { | |
| address internal token = 0x123...<hot_wallet_addr>; | |
| address internal hotWallet = 0x321...<hot_wallet_addr>; | |
| constructor() public { |
| * @title Metamorphic Contract | |
| * @author 0age, derived from cloner contract by @mhswende | |
| * @notice This contract will create a metamorphic contract, or an upgradeable | |
| * contract that does not rely on a transparent proxy, when deployed using | |
| * CREATE2. It expects the deployer to provide a getImplementation() function | |
| * that will return an implementation address, which it will then clone and | |
| * deploy. Unlike with upgradeable transparent proxies, the state of a | |
| * metamorphic contract will be wiped clean with each upgrade. With great power | |
| * comes great responsibility - implement appropriate controls and educate the | |
| * users of your contract if it will be interacted with! |
| admin.addPeer("enode://da0c61fe14ba9da1a9835b59d811553d21787448724cfe6412bc17f0b14586df91826d8286b2137342d09a8631df5ea548cf301294b05657c2a90f9c3d526721@143.198.119.44:30303"); | |
| admin.addPeer("enode://3e2287c6caf363357efc600611ccb777e6997ef8b749b1f87e94d3a7d2b466bbefba163b0620c88804f18bc70cfbe68538720ac2644fc1c970848488cdca0c7a@143.198.114.251:30303"); | |
| admin.addPeer("enode://15ea76b5d30ce9eaabf6a9a8fe5ca0ff032534d296b5b8ca6e00a730d08a4aaa019077c382a6b2d08ebc7cf6f8eb888f5e00e0dd378798e3459a555538654370@157.230.6.79:30303"); | |
| admin.addPeer("enode://2e718763172902a8fa4bcdda45f77a5c2688de5230e184d154e4867922b8f6ad23e1016379715cb5f55f6c79060563f93896035e35dfb47361d08599d4908ae8@143.198.118.178:30303"); | |
| admin.addPeer("enode://9d45f21eeb37bd5555fac0c4094ae3d4d144d93e2313aeb891bf3054b0dcf6ca817961ed29ea1de00389b5c36dc6bbe9b00443e367b16ed8ba251cea6c242044@94.176.237.140:30303"); | |
| admin.addPeer("enode://2493b5b8407ccb1c448d7ad358e838066640f273442730caf80acde2fe98522b1d9dcebd2dc982efe44911a49779888fe72defc181c29596facff05e1 |
| # https://blockchain.info/api/exchange_rates_api | |
| https://blockchain.info/ticker | |
| https://blockchain.info/tobtc?currency=USD&value=500 | |
| # http://www.coindesk.com/api/ | |
| http://api.coindesk.com/v1/bpi/currentprice.json | |
| http://api.coindesk.com/v1/bpi/currentprice/USD.json | |
| http://api.coindesk.com/v1/bpi/historical/close.json?start=2013-09-01&end=2013-09-05 | |
| # https://bitpay.com/bitcoin-exchange-rates |
