Ever wonder what those last 6 characters of your npub actually do? They're not random, they're a mathematical safety net that catches up to 4 typos with 100% certainty. New post exploring how Bech32's BCH codes work, why Nostr chose bech32 over bech32m, and why the algorithm deliberately refuses to auto-correct your mistakes (hint: it could "fix" your key into someone else's). The same math that guided deep space probes now protects your Nostr identity.