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SeedXOR multi-location backup scheme

Full documentation: seedxor.com/

Existig seeds can be broken up with seedXOR or can be used as components of a new a scheme. If there was a BIP39 passphase used keep a copy of the passphrase on every location.

Currently the scheme can be used on a ColdCard and is planned to be implemented in SeedSigner. The seed can also be calculated manually so the ColdCard is not strictly necessary for recovery

Components required for a full restore

  • Coldcard or manual calculation + any BIP32 compatible wallet
  • Seed1
  • Seed2
  • Seed3

Packages for a 2-of-3 setup

Location 1

  • Seed1
  • Seed2

Location 2

  • Seed2
  • Seed3

Location 3

  • Seed1
  • Seed3