BitcoinSimulator

Implemented a cryptocurrency following a simplified version of Bitcoin protocol.

Features including:

• Blockchain
  • Distributed transaction ledger
• Block
  • Previous block hash
  • Merkle tree root
  • Nonce
  • Timestamp
• Transaction
  • Signature (ECDSA)
  • Multiple input and output
  • Transaction fee
• Mining
  • Hash-based Proof-of-Work system
  • Difficulty
  • Mempool (unconfirmed transactions)
  • Coinbase transaction
• Wallet
  • Address (hashed public key)
    • Public key
    • Private key
• Concensus
  • Block verification
  • Transaction verification
• Peer-to-Peer Network
  • Peers join and leave arbitrarily
  • Periodically exchange neighbors
  • Controlled message flooding
• Simulation
  • Web UI
    • Dashboard
    • Parameter configurations

Web UI Simulator

Defaults to 100 peers (80 traders and 10 miners), and each trader creates a transaction every 2~4 seconds.

To start the web UI simulator:

• Install dependencies with mix deps.get
• Install Node.js dependencies with cd assets && npm install
• Start Phoenix endpoint with mix phx.server

Now you can visit localhost:4000 from your browser.

CLI Sample Output

...
[info] Peer joined [id: 4548]
[info] Peer joined [id: 9809]
...
[info] Block mined [transaction count: 1]
[info] Block mined [transaction count: 59]
...

Testing

To run available tests:

• mix test

To run tests with detailed reporting:

• mix test --trace

To see test coverage:

• mix test --cover