Seed phrase backup best practices (and why paper alone fails)
Principles: confidentiality, integrity, availability
Crypto backups are a three-way tension. Cloud sync maximizes availability but often destroys confidentiality. Single metal plates improve integrity against fire, but a single site loses availability in disasters. Most households should combine offline physical backups with deliberate passphrase use and clear inheritance instructions—not screenshots in email drafts.
Metal backups and environmental threats
Stainless or titanium plates resist house fires better than paper in a desk drawer. Test legibility after stamping: ambiguous letters cause catastrophic misreads years later. Store plates in tamper-evident pouches where helpful, and avoid labeling the outside “Bitcoin seed” in plain text if you worry about physical burglary—use a code you and your heirs understand.
Geographic and legal redundancy
Splitting a seed into shamir shares (SLIP39) or multisig setups reduces single-point theft, at the cost of operational complexity. For simpler estates, sealed instructions with an attorney plus one family-held plate can work—never store the seed in the lawyer’s email. Jurisdictions differ on probate access to digital assets; document device PINs separately from seeds where appropriate.
Optional passphrases: power and fragility
A strong passphrase is a second factor you must not forget. If you use one, document its existence (not the passphrase itself) in your estate file so heirs do not assume the seed is “wrong.” See hidden wallet notes.
What not to do
- Never photograph seeds with a phone connected to photo backup services.
- Never store seeds in password managers unless you fully accept cloud breach risk models.
- Never “test” your seed by typing it into a website that claims to verify validity.