Coinkite’s Coldcard Bug Exposed Single-Sig Risk. Multi-Vendor Multisig Is the New Bitcoin Custody Baseline

Coinkite's Coldcard bug exposed single-signature wallet risks, prompting a shift to multi-vendor multisig as the new Bitcoin custody baseline. Coinkite now forces dice rolls and key-press entropy on new Coldcard seeds. The July-August 2026 thefts teach users to avoid generating all keys on one vendor while maintaining self-custody.