Coldcard Bitcoin Thief Likely Used Top Blockchain Services Provider: Report

Bitcoin Magazine Coldcard Bitcoin Thief Likely Used Top Blockchain Services Provider: Report Since over $70 million in Bitcoin was stolen yesterday by an attack that exploited a fault in the Coldcard’s system, it has been reported that the thief used a top blockchain services provider for help.  Writing on X Friday, engineer at payments company Block, Clay Garrett, said that the provider — who he did not name at the request of the services provider — had been contacted after finding blockchain movements matched the “suspected workflow” of the attacker.  “During our investigation of the Coldcard drain yesterday, we identified an unusual pattern in the sweeps,” Garrett said.  “That pattern led us to a hypothesis that has since been confirmed: the operator used a paid account at a well-known blockchain-services provider to query the source addresses and perform other related activity during the sweeps,” Garrett continued, adding that the authorities had been notified.  Galaxy Digital’s research arm also wrote on X that the thief had an unusual pattern of moving the coins.  “The pattern tells us these were all the same attacker — it does not capture the attack itself, which looks the same as if a coin owner chose to move coins,” the company said, adding that Bitcoiners should move funds out of single-signature Coldcard addresses and into secure...