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docs: add Coldcard Mk3 seed-entropy security warning to SIGNING_DEVICES #2242

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docs: add Coldcard Mk3 seed-entropy security warning to SIGNING_DEVICES #2242

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docs: warn about Coldcard Mk3 seed-entropy advisory (Coinkite, Jul 2026)
nrobi144 Aug 6, 2026
cf64d02
Correct firmware/model details per Coinkite advisory (Mk2/Mk3 4.0.1-4…
nrobi144 Aug 7, 2026
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2 changes: 2 additions & 0 deletions doc/SIGNING_DEVICES.md
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Expand Up @@ -29,6 +29,8 @@ writing. It is only supported by the [Edge
firmware](https://github.com/Coldcard/firmware?tab=readme-ov-file#long-lived-branches).
For use in Taproot descriptors you should use version 6.3.3 or higher.

WARNING: Coinkite disclosed (July 2026) a firmware flaw that reduced generated-seed entropy on Coldcard Mk2/Mk3 (firmware 4.0.1-4.1.9) and Mk4/Mk5/Q before their fixed firmware. If your seed was generated on-device with fewer than 50 independent dice rolls, update to fixed firmware, generate a new seed and move your funds. See the advisory: https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/


## [Jade and Jade Plus](https://github.com/Blockstream/Jade)

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