A 38-year-old man by the name of Alexander Vinnik was suspected of being the anonymous leader of one of the world's oldest crypto-currency exchanges and of laundering at least $4 billion has been arrested in Greece, sources and police said on Wednesday. Vinnik was arrested after a tip-off in a small beachside village in northern Greece on a U.S warrant. Police said the United States would seek to extradite him. And according to reports, "at least" $4 billion had been laundered through a crypto-currency platform since 2011 with 7 million bitcoins deposited, and 5.5 million bitcoins in withdrawals.