🧱 Simple Blockchain in Go

This is a basic implementation of a blockchain in Go. It demonstrates core blockchain concepts like:

• Block structure
• SHA-256 hashing
• Proof-of-Work (mining)
• Block chaining via hashes

🛠️ Project Structure

blockchain-go/
├── cmd/
│   └── blockchain/
│       └── main.go         # CLI entrypoint
├── internal/
│   └── blockchain/
│       └── blockchain.go   # Blockchain logic
├── go.mod
└── README.md

🚀 Getting Started

1. Clone the Repository

git clone https://github.com/yourusername/blockchain-go.git
cd blockchain-go

2. Run the Program

go run ./cmd/blockchain

3. Example Output

Mining block 1...
Block mined! Hash: 000a1b4c...
Mining block 2...
Block mined! Hash: 000d9f2e...

Block #1:
Data: First block after Genesis
Hash: ...
PrevHash: ...

Block #2:
Data: Another block
Hash: ...
PrevHash: ...

⚙️ Configuration

Difficulty

In blockchain.go, you can change the mining difficulty by shortening or adding the target prefix. For example, you can increase the difficulty by adding another zero in the prefix, "000"

const targetPrefix = "00" // Difficulty: hash must start with this

🧪 Extend This Project

Here are a few ideas to expand this:

• 🧑‍💻 Create a web API to submit and view blocks (using net/http or gin)
• 💾 Save blockchain data to a file or database
• 📡 Connect multiple nodes with peer-to-peer networking
• 📉 Track and display mining stats or block explorer UI

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📚 Learning Goals

This project is designed to help you learn:

• How blockchains work internally
• Hashing and nonce mechanisms
• Structs and methods in Go
• Command-line Go applications

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📄 License

MIT — feel free to use, copy, and modify.