POPA ReconColdcard Hack Grows to $88.6M as Third Wave
Coldcard Hack Grows to $88.6M as Third Wave The firmware flaw in Coldcard hardware wallets has now drained about 1,367 BTC, worth roughly $89M, from 4,585 wallets across three waves, per Galaxy Research. A Coldcard is a physical device for holding bitcoin. A 2021 coding mistake quietly weakened the randomness of the seeds it created, so keys for thousands of wallets became guessable. Attackers computed those keys and swept the coins remotely, with the physical devices never touched at all. The bug dropped seed entropy to about 72 bits instead of 128, making keys enumerable offline. It affec…
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