02 · from the workshop
How do you store a recovery phrase that will still be readable in twenty years? Not on paper. The Cryptosteel Seed12 Security Kit sets your twelve words in stainless steel, in a capsule that you seal. No electronics, no battery, nothing that can break.
How it works
You slide four letter tiles onto the core per word, in the order of your recovery sentence. Four letters are enough: in the BIP39 wordlist, every word can be recognized by its first four letters. The core goes into the steel capsule, the capsule is closed, and you put a wire seal through it.
Nothing is stamped and nothing is engraved. You don't need a hammer and you can update your backup later, for example if you switch to a new wallet. If you want to know how to handle this smartly first, read how to store your seed phrase in a steel backup.
Note: twelve words, not 24
The Seed12 is made for a twelve-word recovery phrase. The capsule holds up to 64 characters, which is exactly twelve four-letter words. If you have a 24-word recovery phrase, it will not fit and you will need the Seed24.
Not sure how many words you have? Check your backup card or your wallet. Most modern wallets, including the Blockstream Jade and the Trezor Safe, provide you with twelve words by default. For more information, see the guide to safely storing your seed phrase.
The seal is the point
Metal protects your words against fire and water. The seal protects them against people. You cannot open a wire seal without leaving a trace: you can see at a glance whether someone has tampered with your backup. There are three in the box, and You can order loose seals at when you need them.
Buy your backup right away from hardware wallet. The day you need it is the wrong day to have to order one. Check it out hardware wallets lineup.
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