ChipsHacker Noonabout 2 hours ago
Coldcard Entropy Bug Drains $89M
6 min read
A 2021 firmware change routed Coldcard seed generation through a weak pseudorandom fallback, cutting entropy to roughly 40 bits on Mk3 devices. An attacker drained 1,367 BTC from 4,585 wallets in three waves starting July 30, without touching a device.
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