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…

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