SAN FRANCISCO - Alexander Vinnik, the alleged operator of an illicit cryptocurrency exchange used to launder billions of dollars, has been extradited from Greece to San Francisco to stand trial on federal charges.Vinnik, who operated the cryptocurrency exchange BTC-e, arrived in San Francisco on Thursday. "After more than five years of litigation, Russian national Alexander Vinnik was extradited to the United States yesterday to be held accountable for operating BTC-e, a criminal cryptocurrency exchange, which laundered more than $4 billion of criminal proceeds," said Assistant Attorney General Kenneth A. Polite, Jr. Vinnik, 42, was charged in a 21-count superseding indictment...