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Do we have any clarity on which cold card devices were affected?

I haven't seen too much about specific devices. Antoine Poinsot said he at least knew someone with an mk4

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which firmware version?

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Per Coinkite: “Mk3 on version 4.0.1 (March 2021) or any subsequent version that their funds may be at risk”, however some devs seem to think that also Mk2 is affected.

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how much does key generation stuff change between firmwares?

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I haven't seen any good info that gets that specific.

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Also this:

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