Live Blockchain Demo
2. Hash
A cryptographic hash is a fingerprint of digital data. The same input always produces the same hash, but change even one letter and the hash changes completely. Try it: type anything into the data box.
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.