Blockchain demo

Blockchain demo

Six short, hands-on pages. Work through them in order: each builds on the one before. Everything runs in your browser, so you can change any value and see what happens.

1. HashType text and watch its SHA-256 fingerprint change.2. BlockData, a nonce and mining: find a hash that starts with zeros.3. BlockchainChain five blocks together and see why tampering breaks everything after it.4. DistributedThree peers hold copies of the same chain. Which one is right?5. TokensBlocks that hold transactions.6. CoinbaseMining rewards and running balances – who can spend what?

Watch first (optional)

Anders Brownworth’s own walkthrough: blockchain demo video on YouTube.

Based on the blockchain demo by Anders Brownworth (source, MIT licence – see licence). Rebuilt here as a self-contained page; this copy runs entirely in your browser and sends nothing anywhere.