U.S. Marshals' bitcoin auction produces one anonymous winner

``The U.S. Marshals Service had one winner in its auction of nearly 30,000 bitcoin, a spokeswoman said on Tuesday, without revealing the name of the successful bidder. The auction drew 63 bids from 45 registered bidders on Friday. The price of bitcoin rose on Tuesday, adding to Monday's gains. It was last priced at $652.02, up 2 percent on the session, and has gained more than 15 percent since June 25, according to digital currency exchange Coindesk.''