The Russian co-founder of a popular bitcoin exchange will be released from U.S. custody Wednesday, a day after a deal between Washington and Moscow freed American Marc Fogel, a U.S. official said. Alexander Vinnik, the co-founder of BTC-e, is in U.S. custody in California and being prepared for transport to Russia, the official said. A lawyer for Vinnik confirmed that his family had been informed he was getting ready to be sent to Russia.