(Reuters) - The top boss of Bakkt, Mike Blandina, will leave the cryptocurrency trading platform to join JPMorgan Chase & Co to work in payments, according to a source familiar with the matter. Bakkt's majority-owner Intercontinental Exchange Inc on Thursday appointed David Clifton as interim chief executive officer to replace Blandina.Clifton joined ICE in 2008 and is currently its vice president, M&A and integration.The exchange operator said..