Personal Sign Message

import { Secp256k1 } from '@tevm/voltaire/Secp256k1';
import { Hex } from '@tevm/voltaire/Hex';

// Create a private key (32 bytes)
const privateKey = Hex.toBytes(
	"0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80",
);

// Message to sign
const message = "Hello, Ethereum!";

// Personal sign format: "\x19Ethereum Signed Message:\n" + len(message) + message
const prefix = "\x19Ethereum Signed Message:\n";
const messageBytes = new TextEncoder().encode(message);
const prefixedMessage = new TextEncoder().encode(
	prefix + messageBytes.length + message,
);

// Hash the prefixed message
const messageHash = Keccak256(prefixedMessage);

// Sign the hash
const signature = Secp256k1.sign(messageHash, privateKey);