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Coldcard Firmware Bug Let Attackers Drain 594 BTC From Hardware Wallets
Jul 31, 2026 5 min read Security

Coldcard Firmware Bug Let Attackers Drain 594 BTC From Hardware Wallets

A firmware bug in Coldcard Mk3 hardware wallets skipped hardware RNG during key generation, allowing attackers to sweep 594 BTC ($38M) from ~500 wallets in 25 minutes.

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