Verify Bitcoin message signatures

Signature verification depends on the type of address the message was signed with

Ordinals Address `P2TR`

Message signing for P2TR addresses conform to the BIP-322 standard. The following options are available to verify the message signature.

Calling the verifymessage RPC command on a Bitcoin node built from the source of the unreleased BIP-322 feature branch. Reference: https://developer.bitcoin.org/reference/rpc/verifymessage.html https://github.com/bitcoin/bitcoin/pull/24058
Use the NPM package BIP322-js https://www.npmjs.com/package/bip322-js

Note that due to the experimental nature of BIP-322 none of the above options are officially endorsed or audited. Use at your own risk.

Payment Address `P2SH(P2WPKH)`

Messages from the payment address are signed with an ECDSA signature, conforming to the standard described here: https://en.bitcoin.it/wiki/Message_signing

You can decode the signed message and use a cryptographic library to verify the signature.

Using bitcoinjs-message can also be a convenient option if you're working within a JavaScript or Node.js environment. It abstracts away the lower-level details of ECDSA verification and the Bitcoin message signing standard, allowing you to verify signed messages with minimal code:

Step 1: Install bitcoinjs-message

First, you need to install the bitcoinjs-message library. If you're using npm, you can install it by running:

npm install bitcoinjs-message

Step 2: Verify the Message

Once installed, you can use the library to verify a message with just a few lines of code. Here's a simple example:

const bitcoinMessage = require('bitcoinjs-message');

// The message that was signed
const message = "This is a test message";

// The signature in base64 format
const signature = "H8yAIxMVQfVcY4J//yA8hI3Fy2kL...base64signature...";

// The Bitcoin address of the signer
const address = "1ExampleOnlyDoNotSendToThisAddressDoNotTryToDecodeIt";

// Verify the message
const isValid = bitcoinMessage.verify(message, address, signature);

console.log("Is the signature valid?", isValid);

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const bitcoinMessage = require('bitcoinjs-message'); // The message that was signed const message = "This is a test message"; // The signature in base64 format const signature = "H8yAIxMVQfVcY4J//yA8hI3Fy2kL...base64signature..."; // The Bitcoin address of the signer const address = "1ExampleOnlyDoNotSendToThisAddressDoNotTryToDecodeIt"; // Verify the message const isValid = bitcoinMessage.verify(message, address, signature); console.log("Is the signature valid?", isValid);