Setting up Coldcard for use with Casa

⚠️ Security Advisory (Updated August 1, 2026): Coinkite has identified a seed-generation flaw affecting certain Coldcard firmware versions. If you generated your seed on affected firmware, your funds may be at risk. Fixed firmware is available for all affected models. Do not generate a new seed until you've updated.

Casa recommends against adding a Coldcard to your setup unless its seed was generated on fixed firmware or later (Mk2/Mk3: 4.2.0+; Mk4/Mk5: 5.6.0+ standard or 6.6.0X+ Edge; Q: 1.5.0Q+ standard or 6.6.0QX+ Edge).