Product record · COLDCARD
COLDCARD Mk2
COLDCARD Mk2 Bitcoin-only hardware signing device in the COLDCARD lineage.
- Launch
- 2019
- Sales
- end_of_sale
- Support
- supported
- Variants
- —
- Confidence
- medium
- Last verified
- 2026-08-18
Material concerns
Custody and recovery assumptions
Active support, evidence verification, or product type is not a safety endorsement. Missing custody or recovery metadata is shown as unknown rather than inferred as self-custody.
- Custody model
- Unknown / not explicit in the canonical product record
- Key-management model
- Unknown / requires evidence review
- Independent recovery
- Unknown / requires evidence review
Lifecycle
Product timeline
COLDCARD Mk2 released in 2019
Product: COLDCARD Mk2
Coinkite first-party product history and official firmware hardware support establish the mechanical-key COLDCARD Mk2 lineage during 2019.
COLDCARD Mk2 publicly described with new hardware and firmware changes
Product: COLDCARD Mk2
Coinkite publicly described the new COLDCARD Mk2, including mechanical buttons and hardware and firmware changes intended to harden the device against PIN-bypass attacks.
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.
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.
Sources