Arthur Hayes, chief executive officer of BitMEX, speaks during the Consensus: Invest event in New York, U.S., on Tuesday, Nov. 28, 2017. Michael Nagle | Bloomberg | Getty ImagesPresident Donald Trump has granted pardons to three co-founders of the BitMEX global cryptocurrency exchange, CNBC has learned.The co-founders, former BitMEX CEO Arthur Hayes, Benjamin Delo and Samuel Reed, previously pled guilty to a range of federal criminal charges related to money laundering and failure to police the ...