David Schwartz proposed giving two duplicate Bitcoin wallets and their shared PIN to separate people.The setup uses one seed across devices, so it remains a single signature wallet structure.Four suspected Coldcard waves moved about 1815 BTC from more than five thousand addresses overall.Coinkite says fixed firmware protects new seeds but cannot repair phrases generated on affected devices.Multisignature inheritance systems require separate keys, unlike duplicate devices sharing one recovery phrase between them.