Bitcoin: How to sign a message with privateKey on Bitcoin using TS/JS?

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Here is an article on how to sign a message with a private key using bitcoin in a TypeScript application.

Signing messages with private keys in bitcoin

In this article, we will show you how to use the bitcoinjs-lib' library to generate a private key from the seed phrase and then sign messages. We will also show you how to bind the private key to theBtcaddress’ and Nftaddress' endpoints.

Step 1: Generate a private key

First, you need to get a private key from the seed phrase. You can do this by running the following command in the terminal:

bash

BC -L private_key.pem

`

Replace with the path to your seed phrase file.

Step 2: Import libraries and load the private key

Next, we need to import the Bitcoinjs-lib' library and we need to load our private key:

TypeScript

import * as bitcoin from 'Bitcoinjs-lib';

import * as ECC from 'Tiny-SECP256K1';

const privateKey = await('./private_key.pem');

Step 3: Create a message to

sign

Create a message that you want to sign. For example, let’s say we have an NFT contract address and a recipient address:

`TypeScript

const ContractAddress = '0x ...'; // Replace the contract address

const cefcientAddress = '0x ...'; // Replace with the recipient address

Step 4: Sign the message

Now we can create an instance of “BitcoinMessage” from our message and private key:

`TypeScript

const BitCoinMessage = require('Bitcoinjs-lib'). BitcoinMessage;

const bitcoinMessage = new BitcoinMessage({{

ContractAddress,

cefientAddress,

Data: “Hello, world!”,

});

const Signature = await bitcoin.signmessage(privateKey, {

Address: bitcoinmessage.address.btc,

Network: BitcoinNetwork.Mineconomy,

});

Step 5: Bind the private key to the endpoints

Finally, we need to bind our private key to the `btcaddress'' andnftaddress'' endpoints of our application:

` TypeScript

const bitcoin = require(‘bitcoinjs-lib’);

const ECC = require(‘tiny-SECP256K1’);

// Define the endpoints

const ControntendPoint = ‘

const cocientEndPoint = ‘

// Generate a private key from the seed file

const privateKey = await(‘./private_key.pem’);

// Load our private key

const bitcoinPriveKey = await ecc.keyfromprivate(privatekey);

// bind the private key to the endpoints

Async function GetendPoint(privateKey) {

const contract = new BitcoinMessage({

ContractAddress,

Data: «Hello, world!»,

});

const Signature = await bitcoin.signmessage(privateKey, {

Address: bitcoinmessage.address.btc,

Network: BitcoinNetwork.Mineconomy,

});

return {contract, signature};

}

Async function getConcentractEndPoint(privateKey) {

// Create a private key from the seed file

const privateKey = await(‘./private_key.pem’);

const bitcoinPriveKey = await ecc.keyfromprivate(private);

// Load our private key

const bitcoin = require(‘bitcoinjs-lib’);

// bind the private key to the contract endpoint

Return new Promise ((resolve, reject) => {{

getendpoint(privateKey).Then ((data) => {{{

REALVE(data);

}). catch ((error) => {{{

reject(error);

});

});

}

Async function getRecipientEdPoint(privateKey) {

// Create a private key from the seed file

const privateKey = await(‘./private_key.pem’);

const bitcoinPriveKey = await ecc.keyfromprivate(privatekey);

// Load our private key

const bitcoin = require(‘bitcoinjs-lib’);

// bind the private key to the recipient endpoint

Return new Promise ((resolve, reject) => {{

getendpoint(privateKey) .Then ((data) => {{{

REALVE({contract: Data.Contract, Signature: Data.Signature});

}).