CoinDesk·4 min read·medium
How bitcoin cold wallets lost $70 million in an attack that never touched the devices
S
Shaurya Malwa
✦AI Summary
A security vulnerability in Coldcard hardware wallets allowed attackers to predict private keys by exploiting a flaw in the device's random number generation process. Because the keys were generated using predictable data rather than true randomness, attackers were able to drain $70 million in Bitcoin without ever needing physical access to the devices.
Galaxy Research mapped the full event on Friday, finding 1,082.65 BTC swept between 01:10 and 01:51 UTC across six blocks, with three intervening blocks containing nothing, which suggests the transactions were broadcast in batches rather than continuously.
technologycryptobusiness
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