Massive cryptocurrency theft targeting Coldcard hardware wallet users
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Coinkite (Coldcard) users and unidentified hackers
Global
August 2026
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COMPAMIR Editorial Team
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Read our editorial policy- Earlier version 18/4/2026, 6:30:54 PM
Hackers are exploiting a vulnerability in Coldcard wallet seed phrase generation. Approximately $130 million in Bitcoin has been stolen. Coinkite has issued an advisory urging users to update devices and migrate to new seed phrases.
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Coldcard Bitcoin wallet security flaw leads to massive theft
A software flaw in Coinkite's Coldcard devices allowed attackers to predict seed phrases. Approximately 1,367 Bitcoin worth $86 million were stolen from over 4,500 wallets. Coinkite has released fixed firmware for affected models.