Live Blockchain Demo
6. Tokens
So far the blocks carried arbitrary data. Replace that data with transactions — who pays whom, and how much — and the blockchain becomes a ledger of money movements. Try changing a payment on one peer: its whole chain breaks from that block forward, and its copy no longer agrees with the other peers.
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Peer B
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Peer C
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This interactive demo was created by Anders Brownworth and is rebuilt here as a self-hosted, dependency-free version. SHA-256 runs entirely in your browser; blocks turn red when their hash no longer starts with 0000 and green again once re-mined.