Nearly $70 million in Bitcoin was stolen in just 41 minutes after attackers exploited a vulnerability in Coldcard hardware wallets' offline key generation process.
Coldcard vulnerability: weak firmware RNG let attackers predict keys and steal 1,367 Bitcoin ($89M) from 4,585 MK2-MK5 wallets. Firmware security audits now critical for enterprise cold-storage procurement; vendor build decisions reshape custody assumptions.
The theft was carried out by exploiting a vulnerability in Coldcard hardware wallets' offline key generation system
Aug 03, 2026
12:05 pm
What's the storyNearly 1,367 Bitcoins, worth some $89 million, have been stolen from as many as 4,585 offline wallets in a hack that has rocked the crypto world.
The theft was carried out by exploiting a vulnerability in Coldcard hardware wallets' offline key generation system.
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