Ethereum Tx Hash

eth-tx-hash.ts

import { encode } from '@ethereumjs/rlp';
import { ecrecover } from '@ethereumjs/util';
import { keccak256 } from 'ethereum-cryptography/keccak';

// tx: 0xb00b758da7b97dbeedd1ef62592b2c1427c70ca042dc51a63f3a39d8d31ebbcc
const chainId = 0x1n;
const nonce = 0x3n;
const maxPriorityFeePerGas = 0xf4240n;
const maxFeePerGas = 0x73323c225n;
const gasLimit = 0xdd9cn;
const to = hexToBytes('0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48');
const value = 0x0n;
const data = hexToBytes('0xa9059cbb000000000000000000000000352f4c972a4f1640079082eea4f658719ffb3c200000000000000000000000000000000000000000000000000000000390b25c30');
const accessList: [ address: Uint8Array, key: Uint8Array ][] = [];

// as defined in the YP (Appendix H, equation 308)
const rlp = encode([ chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList ]);

// ⚠️ 0x9c68b22e031082ded83e299e884c5b84c94667db3f9de921fd527e7bc23861a6
const txHash = keccak256(new Uint8Array([ 0x2, ...rlp]));

// from the tx data
const v = BigInt(0x1);
const r = hexToBytes('0x31c19c6b7dfcbba6ef0ced907fb30ff992ffc3b6847bb84b31873e090941cae7');
const s = hexToBytes('0x3c69dd761b7eb3762b3515f1041d6227d63a16190dcb68d343be1d2fc17b293a');

const pubKey = ecrecover(txHash, v, r, s);
const pubKeyHash = keccak256(pubKey);

// ✅ 0xaa37a0e0dcdda61d3b7e265bfc0441ebdb87fc9b
const sender = pubKeyHash.slice(-20);

// we add the signature (v,r,s)
const fullRlp = encode([ chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList, v, r, s ]);

// ✅ 0xb00b758da7b97dbeedd1ef62592b2c1427c70ca042dc51a63f3a39d8d31ebbcc
const fulTxHash = keccak256(new Uint8Array([0x2, ...fullRlp]));