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docs: add Coldcard Mk3 seed-entropy security notice to plugin README #10805

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ecdsa merged 2 commits into from
Aug 6, 2026
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docs: add Coldcard Mk3 seed-entropy security notice to plugin README #10805

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docs: warn about Coldcard Mk3 seed-entropy advisory (Coinkite, Jul 2026)
nrobi144 Aug 6, 2026
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docs: remove unicode from Coldcard security notice (per maintainer re…
nrobi144 Aug 6, 2026
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4 changes: 4 additions & 0 deletions electrum/plugins/coldcard/README.md
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# Coldcard Hardware Wallet Plugin

## ⚠ Security notice

Coinkite disclosed (July 2026) a firmware build error that reduced generated-seed entropy on **Coldcard Mk3** (firmware 4.0.1–5.0.3) and pre-fix **Mk4/Q**. Seeds generated on-device without extra dice rolls may be brute-forceable. Update to fixed firmware, generate a new seed and move your funds. See the [Coinkite advisory](https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/).

@SomberNight SomberNight Aug 6, 2026 •
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please remove unicode from your notice

(using unicode dashes vs ascii hyphen-minus)
Can't even be bothered to write a single line of text by hand anymore, huh?

@nrobi144 nrobi144 Aug 6, 2026

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@SomberNight @ecdsa updated. Scanning and updating references to ColdCards in multiple repos is way more effective with LLMs. Why would I do that manually if it's slower and more error prone?


## Just the glue please

This code connects the public USB API and Electrum. Leverages all
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