Coldcard Wallet Vulnerabilities Explained: What Bitcoin Users Need to Know
- Block identified two Coldcard wallet vulnerabilities affecting cryptographic seed generation.
- The flaws impact Mk2–Mk5 and Q models, potentially making some wallet seeds more predictable.
- Affected users should generate new secure seed phrases after updating firmware and moving funds.
Max Guise, the Bitcoin Product Lead at Block, has highlighted key aspects of the latest report from the firm’s Bitcoin engineering and security team investigating the draining of non-Bitkey wallets. The report alleged flaws in cryptographic key generation that may have made some Bitcoin wallets predictable rather than truly random, among other critical issues.
Block’s disclosure has raised broader questions about hardware wallet design, responsible vulnerability disclosure, and how self-custody users should assess the security of their seed phrases and key generation processes.…
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