LabCrypta: A fingerprint for any data

Crypta is a hands-on SHA-256 explorer that turns any input into a fixed-size hash and visualises how a single bit flip cascades through the output. The signature technique is a from-scratch implementation of the full algorithm - padding, the message schedule, and all 64 compression rounds - paired with an avalanche heatmap and a proof-of-work miner, cross-checked byte-for-byte against Node's crypto across every padding boundary. It is a dependency-light build you can download and run locally.