COLDCARD Firmware Update 5.6.2 & 1.5.2Q

Verifiable Seed Mixing; Continued Security Review; and EDGE 6.6.1X/6.6.1QX

COLDCARD Security Update: Seed Generation, Transaction Integrity, and Data Isolation

COLDCARD Mk4, Mk5, and Q users upgrade to firmware 5.6.1 for Mk4/Mk5 and 1.5.1Q

Monitor the Coinkite Blog for Security Updates

Official, timestamped COLDCARD advisories, firmware notices, and migration guidance.

One COLDCARD, Many Wallets: Better Backups with BIP-85

Use COLDCARD BIP-85 to derive separate child seeds for compatible wallets, reduce seed-backup sprawl, and keep the parent seed off every destination device.

arca Reservations Are Open

Offline Is Not Enough: COLDCARD vs a Disconnected Phone