Shares of Coinbase Global Inc (NASDAQ:COIN) were last seen down 15.5% at $319.31, after the company's second-quarter earnings of 12 cents per share and revenue of$1.5 billion both missed estimates. The cryptocurrency exchange also issued a disappointing third-quarter subscription and services revenue outlook, with no fewer than four analysts slashing their price targets after the event, including J.P. Morgan Securities to $432 from$404. Fresh off three-straight monthly wins, COIN is up 28.2% year-to-date ...