SeedXOR multi-location backup scheme

Full documentation: seedxor.com/

Existing seeds can be broken up with seedXOR or can be used as components of a new a scheme. If there was a BIP39 passphrase 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

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Components required for a full restore

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

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Packages for a 2-of-3 setup

Location 1

• Seed1
• Seed2

Location 2

• Seed2
• Seed3

Location 3

• Seed1
• Seed3