Verifying Signatures on Bitcoin Nodes with JavaScript/TypeScript
In order to verify the signature of a user’s message on a Bitcoin node, we need to make sure that the signature is correct and comes from the same private key. In this article, we will see how to achieve this using JavaScript/TypeScript.
Environment Setup
Before we begin, make sure that Node.js is installed on your system. We will also use the crypto module to create a SHA-256 hash of the user’s message.
const crypto = require('crypto');
Signing the Message with Bitcoin-JS
Bitcoin-JS is a JavaScript library that allows us to interact with Bitcoin nodes. We can sign our message using this library:
async function signMessage(node, message) {
const privateKey = wait node.getPrivateKey();
const signature = wait privateKey.sign(message);
return signature;
}
Verifying the signature on a Bitcoin node
Once we have signed the message with Bitcoin-JS, we need to verify it on a Bitcoin node. We will use the bitcoinjs-lib library for this purpose.
const bitcoinjsLib = require('bitcoinjs-lib');
async function verifySignature(node, signature, message) {
const publicKey = wait node.getPublicKey();
const isValid = wait bitcoinjsLib.verifySignature(signature, publicKey, message);
return isValid;
}
Example usage
Here is an example of using these functions:
const bitcoinNode = '
const privateKey = wait bitcoinNode.getPrivateKey();
// Sign the message with Bitcoin-JS
signMessage(bitcoinNode, Sign this message to prove that you own this wallet, (err, signature) => {
if (err) console.error(err);
else {
const publicKey = wait bitcoinNode.getPublicKey();
const isValid = verifySignature(bitcoinNode, signature, Sign this message to prove that you own this wallet);
console.log(isValid); // Must be true
}
});
Error Handling
It is essential to handle errors properly when using Bitcoin-JS. We can do this by catching any exceptions that may occur.
signMessage(bitcoinNode, Sign this message to prove that you own this wallet, (err) => {
if (err) console.error(err);
});
By following these steps and examples, we can verify the signature of a user’s message on a Bitcoin node using JavaScript/TypeScript.