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Blockchain in Go

This is a simple blockchain implementation in Go. It consists of:

  • Transactions with a sender, receiver, and amount
  • Blocks that contain transactions and the hash of the previous block
  • A Blockchain that consists of a series of blocks

Features

  • Generate new blocks containing transactions
  • Calculate the hash for blocks
  • Validate blocks by comparing hashes
  • Maintain an immutable transaction history

Code Overview

The key components:

  • Transaction struct - A basic transaction between a sender and receiver
  • Block struct - Contains transactions, metadata, and cryptographic hash
  • Blockchain struct - Sequence of blocks with hash pointers

Core functionality:

  • NewBlock() - Create and initialize new blocks
  • calculateHash() - Generate SHA-256 hash for blocks
  • AddBlock() - Append new blocks to the blockchain

The main() function demonstrates creating a blockchain, adding blocks, and printing the results.

Running the Code

To run the example:

go run blockchain.go

This will initialize a blockchain, add some sample blocks, and print details to stdout.

Next Steps

Possible improvements:

  • Persist the blockchain data structure
  • Implement consensus algorithms
  • Add transaction signatures and verification
  • Optimize hashing and serialization
  • Create miners that compete to add blocks
  • Enable peer-to-peer network communication
  • Add RPC interface for queries and updates

License

This code is released under the MIT License. Feel free to modify and reuse according to the terms.