Chris Giancarlo, the former senior U.S. markets cop known as "Crypto Dad," appeared to criticize his successors in Washington as they crack down on the cryptocurrency industry.

Under Giancarlo's watch as chairman, the U.S. Commodity Futures Trading Commission in 2017 approved regulated futures contracts tied to bitcoin (BTC), and, to this day, they remain the only fully regulated crypto product traded in the U.S.

Their success, he added, is "proof that regulators can engage successfully with crypto if they have the will to do so."