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docs: add Coldcard Mk2/Mk3 seed-entropy security warning to README #524

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docs: add Coldcard Mk2/Mk3 seed-entropy security warning to README #524

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e45164a
docs: warn about Coldcard Mk3 seed-entropy advisory (Coinkite, Jul 2026)
nrobi144 Aug 6, 2026
5e2fc95
Remove unicode from Coldcard warning (use plain ASCII)
nrobi144 Aug 6, 2026
dbd697b
Correct firmware/model details per Coinkite advisory (Mk2/Mk3 4.0.1-4…
nrobi144 Aug 7, 2026
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1 change: 1 addition & 0 deletions apps/coordinator/README.md
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Expand Up @@ -126,6 +126,7 @@ management software.
- [Ledger Nano X](https://www.ledger.com/products/ledger-nano-x)

- [Coldcard Mk2, Mk3, & Mk4](https://coldcard.com/)
- **Security warning (July 2026):** Coinkite disclosed a firmware flaw reducing generated-seed entropy on Coldcard Mk2/Mk3 (firmware 4.0.1-4.1.9) and Mk4/Mk5/Q before their fixed firmware. Update to fixed firmware, generate a new seed and move funds - see the [Coinkite advisory](https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/).

- [Hermit](https://github.com/unchained-capital/hermit)

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