Here is an article on how to sign a message with a private key using Bitcoin in TypeScript.
Signing messages with private keys in Bitcoin
In this article, we’ll show you how to use the bitcoinjs-lib' library to generate a private key from your source phrase, and then use it to sign messages. We will also show how to bind a private key to thebtcAddressandnftAddressendpoints of our application.
Step 1: Creating a private key
First you need to create a private key from your source phrase. This can be done by running the following command in the terminal:
bc - l < path_to_seed_phrase_file > private_key .pem
Replace with the path to the seed phrase file.
Step 2: Import libraries and download private key
Next, we need to import thebitcoinjs-liblibrary and load our private key:
typewriting
import * as bitcoin from 'bitcoinjs-lib';
import * as ecc from 'tiny-secp256k1';
const privateKey = await require('./private_key.pem');
Step 3: Create a signature message
Create a message that you want to sign. For example, suppose we have an NFT contract address and a recipient address:
typewriting
const contractAddress = '0x...'; // Replace with contract address
const recipient_address = '0x...'; // Replace with recipient address
Step 4: Sign a message
Now we can create an instance of BitcoinMessagefrom our message and private key:
typewriting
const BitcoinMessage = require('bitcoinjs-lib').BitcoinMessage;
const bitcoinMessage = new BitcoinMessage({
contract address,
Recipient's address,
data: "Hello, peace!"
});
const signature = expectbitcoin.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 thebtcAddressandnftAddressendpoints of our application:
`typewriting
const bitcoin = require(‘bitcoinjs-lib’);
const ecc = require(‘tiny-secp256k1’);
// Define endpoints
const contractEndpoint = ‘
const receiveEndpoint = ‘
// Create a private key from the source phrase file
const privateKey = await require(‘./private_key.pem’);
// Download our private key
const bitcoinPrivateKey = await ecc.keyFromPrivate(privateKey);
// Bind the private key to the endpoints
async function getEndpoint (privateKey) { ;
const contract = new BitcoinMessage({
contract address,
data: “Hello, peace!”
});
const signature = expectbitcoin.signMessage(privateKey, { {
address: BitcoinMessage.Address.BTC,
network: BitcoinNetwork.MINECOnomy,
});
return {contract, signature};
} }
async function getContractEndpoint (privateKey) { ;
// Create a private key from the source phrase file
const privateKey = await require(‘./private_key.pem’);
const bitcoinPrivateKey = await ecc.keyFromPrivate(privateKey);
// Load our private key
const bitcoin = require(‘bitcoinjs-lib’);
// Bind the private key to the contract endpoint
return new promise ( (allow, reject) => {
getEndpoint(privateKey).then((data) => {
resolve (data);
}).catch((error) => {
reject (error);
});
});
} }
async function getRecipientEndpoint (privateKey) { ;
// Create a private key from the source phrase file
const privateKey = await require(‘./private_key.pem’);
const bitcoinPrivateKey = await ecc.keyFromPrivate(privateKey);
// Load our private key
const bitcoin = require(‘bitcoinjs-lib’);
// Bind the private key to the recipient endpoint
return new promise ( (allow, reject) => { return new promise ( (allow, reject) => {
getEndpoint(privateKey).then((data) => {
resolve({ contract: data.contract, signature: data.signature });
}).
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