Discovering a BTC address using a public key with node js

Question

Discovering a BTC address using a public key with node js

My apologies for any language barriers!

Is there a way to decode the hexadecimal public key from a BTC signature script into a string address using node js?

For instance, if I have this hex public key:

03745AAAF364030720B2D14DE50A3310EEF521C91E36353DCA20813713535C005A

After decoding it, I should obtain the corresponding bitcoin address like this:

1GNXpcYzasmmXvM4rNgkvZ5SzXgL4L9Ch6

I came across a question on regarding the decryption of ScriptSig in btc transactions. One part of the answer included this fragment:

...
21: OP_DATA_0x21:        compressed pub key (33 Bytes)
    03745AAAF3640307:20B2D14DE50A3310:EEF521C91E36353D:CA20813713535C00:5A
    This is MultiSig's compressed Public Key (X9.63 form)
    corresponding bitcoin address is:    1GNXpcYzasmmXvM4rNgkvZ5SzXgL4L9Ch6
...

Based on this information, it seems that btc public keys are encoded in ANSI X9.63 format.

Are there methods available in nodejs to decode ANSI X9.63 format?

Thank you very much!

node.js cryptography bitcoin

Answer 1

Answer №1

I have discovered the solution. You can utilize bitcoinjs-lib and the payments module to achieve it:

var bitcoin = require('bitcoinjs-lib');

const pubKey = "03745AAAF364030720B2D14DE50A3310EEF521C91E36353DCA20813713535C005A";

const { address } = bitcoin.payments.p2pkh({ pubkey: new Buffer(pubKey, 'hex') });

console.log(address); //1GNXpcYzasmmXvM4rNgkvZ5SzXgL4L9Ch6

Answer 2

I have discovered the solution. You can utilize bitcoinjs-lib and the payments module to achieve it:

var bitcoin = require('bitcoinjs-lib');

const pubKey = "03745AAAF364030720B2D14DE50A3310EEF521C91E36353DCA20813713535C005A";

const { address } = bitcoin.payments.p2pkh({ pubkey: new Buffer(pubKey, 'hex') });

console.log(address); //1GNXpcYzasmmXvM4rNgkvZ5SzXgL4L9Ch6

Answer 3

Answer №2

First, ensure that node and npm are installed on your computer.

Next, use npm to install the bitcoinjs library:

Run the following command in your node terminal:

npm install bitcoinjs-lib

After installing the library, require it in your code:

var bitcoin = require("bitcoinjs-lib")

Create a variable for the keyPair:

var keyPair = bitcoin.ECPair.makeRandom(); // or var keyPair = "03745AAAF364030720B2D14DE50A3310EEF521C91E36353DCA20813713535C005A"

To test the address, log it to the console:

console.log(keyPair.getAddress());

Save the bitcoin address to a variable:

var address = keyPair.getAddress();

Test the private key by logging it to the console:

console.log(keyPair.toWif());

Store the private key in a variable:

var pkey = keyPair.toWIF();

Answer 4

First, ensure that node and npm are installed on your computer.

Next, use npm to install the bitcoinjs library:

Run the following command in your node terminal:

npm install bitcoinjs-lib

After installing the library, require it in your code:

var bitcoin = require("bitcoinjs-lib")

Create a variable for the keyPair:

var keyPair = bitcoin.ECPair.makeRandom(); // or var keyPair = "03745AAAF364030720B2D14DE50A3310EEF521C91E36353DCA20813713535C005A"

To test the address, log it to the console:

console.log(keyPair.getAddress());

Save the bitcoin address to a variable:

var address = keyPair.getAddress();

Test the private key by logging it to the console:

console.log(keyPair.toWif());

Store the private key in a variable:

var pkey = keyPair.toWIF();

Discovering a BTC address using a public key with node js

Answer №1

Answer №2

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