Mini-Java-Based-Blockchain-System

Java Blockchain with transaction fees, coinbase rewards, and dynamic difficulty. Implements UTXO-based transactions, wallet signing, block mining with Merkle roots, and automatic difficulty adjustment, providing a practical simulation of a functional cryptocurrency system.

Java Blockchain System

This project implements a basic blockchain system in Java, extended to support transaction fees, coinbase transactions, and dynamic difficulty adjustment. It is based on a university course project for CSC438 Blockchain Systems.

Features

• Transaction System

  • Users can create cryptocurrency transactions using UTXOs.
  • Transaction fees are supported, allowing miners to collect fees.

• Mining

  • Blocks contain multiple transactions.
  • Coinbase transactions reward miners for successfully mining a block.
  • Difficulty adjusts automatically based on the average time to mine the last n blocks.

• Wallet

  • Generates public/private key pairs.
  • Signs transactions for secure transfers.

• Blockchain Integrity

  • Validates transactions and blocks before addition.
  • Computes Merkle root for transactions within a block.

Implementation Details

• Java classes: Transaction, Block, Wallet, TransactionInput, TransactionOutput.
• Mining includes proof-of-work and difficulty adjustment.
• Transactions consume previous UTXOs and generate new ones.
• Sample wallets demonstrate the creation and transfer of cryptocurrency.

TO DO LIST

-Have to work on UI -Documentation

How to Run

1. Clone the repository:

   git clone <repository-url>
   cd blockchain-java