https://github.com/st3b1t/bitcoin-nodejs-playground

This repository contains small experiments with a series of scripts that implement in a few lines some of the workings of Bitcoin or show and process some of the data structures of the blockchain for greater understanding.
https://github.com/st3b1t/bitcoin-nodejs-playground

bitcoin bitcoin-hacking bitcoinjs-lib javascript nodejs zeromq

Last synced: about 1 month ago
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This repository contains small experiments with a series of scripts that implement in a few lines some of the workings of Bitcoin or show and process some of the data structures of the blockchain for greater understanding.

• Host: GitHub
• URL: https://github.com/st3b1t/bitcoin-nodejs-playground
• Owner: st3b1t
• License: gpl-3.0
• Created: 2024-05-23T23:40:20.000Z (8 months ago)
• Default Branch: master
• Last Pushed: 2024-11-19T10:22:02.000Z (about 2 months ago)
• Last Synced: 2024-11-19T11:29:31.433Z (about 2 months ago)
• Topics: bitcoin, bitcoin-hacking, bitcoinjs-lib, javascript, nodejs, zeromq
• Language: JavaScript
• Homepage:
• Size: 2.94 MB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Bitcoin Nodejs Playground

This repository contains small experiments with a series of scripts that implement in a few lines some of the workings of Bitcoin or show and process some of the data structures of the blockchain for greater understanding.

## 1. Stream Transactions and OP_RETURN

Stream in the browser via WebSocket any transaction and OP_RETURN of your Bitcoin Full Node from [ZeroMQ](https://github.com/zeromq/zeromq.js/) interface

Server side written in NodeJs [Fastify](https://github.com/fastify) and [BitcoinJs-lib](https://github.com/bitcoinjs/bitcoinjs-lib)

### Requirements:

Add in `bitcoin.conf` enable this line:

`zmqpubrawtx=tcp://127.0.0.1:28332`

npm dependecies: zeromq bitcoinjs-lib fastify @fastify/websocket

```bash

$ npm install

```

#### Optionals:

command line utility(part of bitcoin-core): `bitcoin-tx`

### RUN

specify HOST of Bitcoin and ZeroMQ port

```bash

$ export HOST=127.0.0.1 PORT=28332

$ node zmq_tx_websocket_fastify.js

```

show in the browser at http://localhost:8080/

![](images/zmq_tx_wesocket_fastify.gif)

---

## 2. Proof Of Work

```bash

$ node proofofwork.js

```

![](images/proofofwork.gif)

## 3. Proof Of Work Binary comparison

The hash comparison occurs at the binary level, allows greater granularity of target diffucilty

```bash

$ node proofofwork_binary.js

```

![](images/proofofwork_binary.gif)

# Donate ❤️ sats via LN ⚡ to incentivize work of this repository

[![image](https://raw.githubusercontent.com/st3b1t/st3b1t/main/donate.png)](https://getalby.com/p/st3b1t)