Coldcard hack steals $86 million in bitcoin from more than 4,500 wallets

Hackers have found a software flaw in Coldcard, a popular hardware Bitcoin wallet that is designed to keep cryptocurrency offline in “cold storage,” and are stealing millions of dollars in an ongoing attack.

Coinkite Inc., the Canada-based company behind Coldcard wallets, warned users late last week that a security flaw had compromised some wallets. By Monday, hackers had stolen about 1,367 Bitcoin worth nearly $86 million from more than 4,500 wallets, according to Galaxy Research.