13/07/2025
Ever wondered why your crypto wallet gives you exactly 12 words?
Each word comes from a list of 2048 words, meaning each one encodes 11 bits of data. Multiply that by 12 words, and you get 132 bits.
But wait — your wallet only needs 128 bits of entropy.
So where do the extra 4 bits go?
They’re not useless — they’re a checksum, a clever trick from the BIP-39 standard.
✔️ 128 bits of actual entropy
🔁 4-bit checksum (from SHA-256 hash)
➕ Total = 132 bits = 12 words = one secure vault
This checksum helps wallets detect typos or invalid phrases when recovering access.
Web3 is wild — and the deeper I go, the more elegant it gets.
