Elizabeth Bisbee, head of investigations at Chainalysis Government Solutions, testified in a case between the U.S. government and Roman Sterlingov, the alleged creator of Bitcoin Fog, a cryptocurrency mixer used to anonymize bitcoin transactions. Chainalysis’ Reactor software was used to track cryptocurrency payments in Sterlingov’s criminal investigation, and is now being challenged by Sterlingov’s defense. Bisbee was unable to provide the court with statistical error rates for Chainalysis’ Reactor software and denied being aware of any scientific evidence for its accuracy. Chainalysis reportedly judges its software’s accuracy using customer feedback.