Bitcoin: After signing a message, how to verify the signature with JavaScript/TypeScript?

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Verifying Signatures on Bitcoin Nodes Using JavaScript/TypeScript

To verify the signature of a user 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 discuss how to achieve this using JavaScript/TypeScript.

Setting Up the Environment

Before we begin, make sure that you have Node.js installed on your system. We will also use the crypto module to generate a SHA-256 hash of the user message.

const crypto = require('crypto');

Signing Messages 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 = await node.getPrivateKey();
const signature = await privateKey.sign(message);
return signature;
}

Verifying the signature in a Bitcoin node

Once we have signed a message with Bitcoin-JS, we need to verify it in a Bitcoin node. For this, we will use the “bitcoinjs-lib” library.

const bitcoinjsLib = require('bitcoinjs-lib');
async function verifySignature(node, signature, message) {
const publicKey = await node.getPublicKey();
const isValid = await bitcoinjsLib.verifySignature(signature, publickey, message);
return is valid;
}

Usage Example

Here is an example of using these functions:

const bitcoinNode = '
const privateKey = await bitcoinNode.getPrivateKey();
// Sign a 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 = await 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

When using Bitcoin-JS, it is important to handle errors properly. We can do this by catching all possible exceptions.

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.