CoinTelegraph
Coldcard Forces Users to Generate New Seeds After Critical Security Flaw
August 21, 2026•07:13 AM
Coinkite has issued a critical security alert for Coldcard hardware wallet users, urging immediate generation of new seed phrases following the release of firmware 5.6.1 for Mk4 and Mk5 devices and 1.5.1Q for the Coldcard Q. The security upgrade fundamentally strengthens seed phrase generation by mandating user-supplied entropy combined with enhanced device randomness, addressing critical vulnerabilities in the previous implementation. This mandatory security measure comes with a stark warning: existing vulnerable seed phrases remain compromised despite the firmware update. The new protocol requires users to contribute entropy through at least 65 unpredictable keypresses, 50 rolls of a six-sided die, or 128 coin flips, which are then combined with randomness from multiple device sources including secure elements and hardware RNG. For maximum security, Coldcard users must generate new seed phrases immediately, as the old ones remain susceptible to potential breaches.
This is a summarized and adapted version by Artificial Intelligence. To read the complete original story, visit the official source.
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