A lot of people wonder why a plate for writing down your words only has room for four letters per word.

The 24 words that every make of device — Ledger, Trezor, KeepKey, Digital Bitbox, SafePal or SecuX — picks at random come from BIP39.

None of those words shares the same first four letters with any other. For example:

  • add
  • addict
  • address

You will notice the fourth letter is never the same, which means we only need to write down four letters.

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