An interactive SHA-256 visualizer -- this is what real "crypto" looks like:
via 
Hash Explained
Hash Explained - Interactive Hash Visualizer
SHA-256 algorithm explained with an interactive, step-by-step visualizer.
Stacker News
🎉 Interactive SHA-256 visualizer \ stacker news
SHA-256 is everywhere: bitcoin, TLS, Git, proofs, ... Yet most explanations skip the internal mechanics and jump straight from: Input → black box...