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$38M stolen from Coldcard bitcoin wallets due to key generation flaw in firmware since 2021

Market News
31 Jul 2026
Coindesk
View Source
Bearish
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An attacker exploited a flaw in Coldcard hardware wallets' key generation, stealing about 594 BTC (worth $38 million) from around 500 wallets in under 30 minutes. The vulnerability, introduced in firmware version 4.0.0 in March 2021, caused the wallets to use predictable software-based keys instead of secure hardware randomness, making seeds guessable. Only wallets created on Mk3 devices with firmware 4.0.1 or later are affected, while newer models appear safe. The theft has had little impact on bitcoin's market price so far, and Coinkite has warned users to check their devices and firmware versions.

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