Blockchain CLI

Simple Blockchain Command Line Interface

📝 Features

• ⩩ SHA256
• 📦 Block: Index, Previous Hash, Timestamp, Data, Nonce, Hash
• ⛓️🧱 In memory array to store blockchain
• ⛏️ Proof Of Work
• 💻↔️💻 Local Peer to Peer Network
• 📜 Allow viewing event and protocol log entries

  ⚠️ Note: Data in the block is of type string.

🚀 Installation

⚙️ Requirements

• Node.js ≥ v22
• NPM ≥ v11
• Git

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📥 Steps

# 1. Clone the repository
git clone https://github.com/whisky81/blockchain-cli.git

# 2. Navigate into the project folder
cd blockchain-cli

# 3. Install dependencies
npm install

# 4. Build and run the app
npm run build
npm run dev

🧪 CLI Testing (Unix-like systems)

# Link the CLI globally for local testing
npm run link-cli

# Now you can run the CLI directly
blockchain

🛠️ Built With

• libp2p – Peer-to-peer networking framework
• chalk – Terminal string styling
• node:readline/promises – Promise-based CLI input handling
• node:crypto – Native cryptographic functionality
• node:fs/promises

🙏 Acknowledgements

📖 Part of the code and ideas were referenced from
https://github.com/0xs34n/blockchain

🐘⚙️📄 Libp2p configuration object

const config = {
  addresses: {
    listen: ["/ip4/0.0.0.0/tcp/0", "/ip4/0.0.0.0/tcp/0/ws"],
  },
  transports: [tcp(), webSockets()],
  streamMuxers: [yamux()],
  connectionEncrypters: [noise()],
  peerDiscovery: [mdns({ interval: 2000 })],
};