Product record · COLDCARD

COLDCARD Mk3

hardware_deviceactiveunknownsupported

COLDCARD Mk3 Bitcoin-only hardware signing device in the COLDCARD lineage.

Launch: —
Sales: unknown
Support: supported
Variants: —
Confidence: medium
Last verified: 2026-08-14

Lifecycle

Product timeline

2026-07-30

vulnerability_disclosedcritical

Seed-generation entropy defect disclosed

COLDCARD disclosed a seed-generation defect in affected firmware lines. Fixed releases restore the intended hardware-randomness path for future seed generation, but existing affected seeds require migration unless an advisory exception applies.

Scope: seed_generationFunds affected: unknownAction: update, migrateEvidence: 1

2026-07-31

firmware_fixcritical

Fixed COLDCARD firmware released across supported model lines

Coinkite released fixed firmware for the supported COLDCARD model and track matrix and published migration guidance for existing affected seeds.

Scope: seed_generationFunds affected: unknownAction: update, migrateEvidence: 2

Sources