FM-39 · Seed phrase concealmentDistribution: unlimited. Copy freely.
Bitcoin Seed BookSelf-custody field manual

What steganography cannot do

Hiding stops the glance. It does nothing against the person who knows where to look, and that is who takes seed phrases. Read it What steganography cannot do

Why a public cipher hides your seed but doesn't encrypt it

The ciphers hide your words from a casual look. Anyone who suspects the list can test all 9,132 of them in minutes. Read it Why a public cipher hides your seed but doesn't encrypt it

The 25th word: a BIP-39 passphrase turns the numbers into nothing

The passphrase is the lock. Choose it, store it apart from the numbers, and test it before you fund the wallet. Read it The 25th word: a BIP-39 passphrase turns the numbers into nothing

Disguises that survive a second look

Receipts, part numbers, trip logs, production logs and sports scores, worked through with the public example, and the tells that break them. Read it Disguises that survive a second look

One-time pad vs. a public book cipher

What a real one-time pad on a seed would take, and why this site publishes its ciphers instead. Read it One-time pad vs. a public book cipher

Numbers in your head: memorising a numeric seed

Words or numbers in your head, the peg system and the memory palace worked on the public example, and why memory is never the only copy. Read it Numbers in your head: memorising a numeric seed

The five-dollar wrench

Nobody breaks the cryptography; they threaten the person. Duress, decoy wallets, time-locks, and why the goal is to have nothing you can hand over today. Read it The five-dollar wrench