TCoin - Java Cryptocurrency

This project demonstrates the core ideas behind a simple cryptocurrency and blockchain written in Java.

It includes:

• Creating wallets: new Wallet();
• Generating public/private key pairs using Elliptic Curve Cryptography (ECC)
• Securing transactions with digital signatures
• Sending funds via:
  Block.addTransaction(walletA.sendFunds(walletB.publicKey, 20));

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Features

• Wallets
  Generate ECC key pairs used to sign and verify transactions.

• Blockchain
  Each block contains a timestamp, previous hash, Merkle root, nonce, and a list of transactions.
  Blocks are mined by finding a hash that starts with a certain number of zeros (difficulty).

• Transactions
  Signed by the sender’s private key to prove ownership of funds.

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Quick Example

Wallet walletA = new Wallet();
Wallet walletB = new Wallet();

Block block1 = new Block("0");
block1.addTransaction(walletA.sendFunds(walletB.publicKey, 20));

int difficulty = 3;
block1.mineBlock(difficulty);