Nick Neuman(@Nneuman):It sounds like Mk4, Q, and Mk5 are also vulnerable in a different way than Mk3. Slightly less problematic than Mk3 but still not great to keep using. If you're using single sig Coldcard at the moment you should move your assets to a different wallet (multisig, exchange, other HWW) to be safe.

Nick Neuman

@Nneuman

Reinventing the Swiss bank for the sovereign individual | CEO & Cofounder of Casa @CasaHODL.

Joined June 2011

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Nick Neuman@Nneuman

2026.07.30 23:53

It sounds like Mk4, Q, and Mk5 are also vulnerable in a different way than Mk3. Slightly less problematic than Mk3 but still not great to keep using. If you're using single sig Coldcard at the moment you should move your assets to a different wallet (multisig, exchange, other HWW) to be safe.

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