After rocky week, Coinbase becomes first crypto exchange to join the S&P 500

 Brian Armstrong is the chief executive of Coinbase, the largest U.S. cryptocurrency exchange. (Jason Armond / Los Angeles Times). By Queenie WongStaff …  Brian Armstrong is the chief executive of Coinbase, the largest U.S. cryptocurrency exchange. (Jason Armond / Los Angeles Times). By Queenie WongStaff … Read More