Forty-one minutes is all the time it took for hackers to steal millions of dollars worth of bitcoin from one of the systems considered the safest in the world to store cryptocurrency: cold wallets (a crypto wallet that does not connect to the internet and keeps user keys offline). In under an hour last Thursday, attackers used a vulnerability in a system called Coldcard and took the equivalent of $70 million. But the cybercriminals continued their attack, and so far have stolen an additional $46 million, according to data from blockchain intelligence firm Galaxy Research.

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