Bloomberg reports that the U.S. Commodity Futures Trading Commission (CFTC) is investigating crypto exchange BitMEX, according to people familiar with the matter. The months-long CFTC probe is focused on whether BitMEX broke rules by allowing Americans to trade on the platform. BitMEX CEO Arthur Hayes said in an interview in January that BitMEX removes anyone who violates the company's rules barring U.S. residents. But it is possible clients masked their location by using virtual private networks (VPNs) to assign their computer an Internet protocol address from a BitMEX permitted country, tricking filters put in place, Hayes said.