Seed phrases: the one backup that matters
Twelve or twenty-four words regenerate every key your wallet will ever use. Treat them accordingly.
At a glance
- A seed phrase regenerates every key a wallet will ever produce — it is not a password, it is the master value.
- There is no alert if someone else copies it. The only defence is that nobody else ever sees it.
- Store it physically, in the exact number of places you decided on, and nowhere digital — not a photo, not a note, not a password manager.
A seed phrase is not a password. It is the master value that a deterministic wallet uses to generate every private key it will ever produce, present and future. Anyone who has the phrase can regenerate every one of those keys on a different device, instantly and undetectably, without touching yours.
That last part is what makes it different from every other credential people are used to protecting. There is no login alert, no session to revoke, no way to know someone else now holds it. The only defence is that nobody else ever sees it.
The phrase should exist in exactly the number of physical places you decided on, and nowhere else. Not in a password manager, not in a photo, not in a note synced to a cloud account — each of those turns a hardware-wallet's offline key into a key that is one data breach away from being online.
A phrase written on paper is fine against everything except fire and flood; a phrase stamped in metal survives both. Whichever medium, the test is the same: could a stranger who found this one item alone move your funds? If yes, it needs to be somewhere they can't find it.
Key terms
- Seed phrase
- A sequence of 12 or 24 words encoding the master value a wallet derives every key from.
- Deterministic wallet
- A wallet that generates all its keys from one seed, so a single backup recovers everything.
- Cold backup
- A copy of a seed phrase stored on a medium that has never touched the internet.
Frequently asked
Can I change my seed phrase if I think it's been exposed?
Not directly — the fix is to move funds to a brand-new wallet with a freshly generated phrase, since the old one can never be made safe again once seen.
Is it safe to split my seed phrase across multiple locations?
It can improve security against any one location being found, but increases the risk of losing access if you lose track of how the pieces fit together — plan the reconstruction method carefully.
What if I forget my seed phrase but still have the device?
As long as the device is accessible and unlocked, you don't need the phrase for normal use — you'd only need it to recover on a different device or after a factory reset.