Your seed phrase — those 12 or 24 words — IS your bitcoin. The hardware wallet is replaceable; the words are not. Anyone who reads them can take everything, and if they are destroyed with no copy, no one on Earth can recover your coins. Storing them well is the single highest-stakes task in self-custody.
The non-negotiables
- Never digital. Ever. No photos, no cloud notes, no password managers, no email drafts, no “encrypted” files. The moment the words touch an internet-connected device, they are hot.
- Never share. No legitimate company, support agent, or app will ever ask for your seed phrase. Every such request is theft in progress.
- Handwritten first, metal soon after. Paper is a fine first backup and a terrible only backup.
Metal backups: the standard
House fires burn hotter than paper survives; floods and decades of humidity do slower damage. Stainless steel plates that you stamp or engrave with the words — Cryptosteel, Blockplate, and similar products — survive all of it for $30–50. For any meaningful holding, this is the obvious upgrade.
Where to keep it
The goal is separating failure domains: seed backup in a different location than the device, so no single burglary, fire, or flood takes both. Common setups, in increasing order of robustness: a home safe; a home safe plus a copy with a trusted family member or in a bank safe-deposit box; a passphrase-protected wallet where the metal backup alone is not sufficient to steal funds. Each step adds security and complexity — climb only as high as you can maintain.
Should you split the phrase?
Cutting a seed in half and storing the halves separately sounds clever and usually is not — losing either half loses everything, and half a seed meaningfully weakens security against a determined finder. If you want backup-splitting done properly, use a wallet supporting Shamir backup (Trezor Safe series) or a passphrase. Do not invent your own scheme.
The annual check
Once a year: read the backup, confirm every word is legible, confirm its location still makes sense (people move, marriages change, safes get sold). Set a calendar reminder. Most catastrophic losses are discovered years too late.