Coinbase (NASDAQ: COIN) reported a sharp drop in quarterly profit on Thursday, July 31, that sent shares tumbling, with the crypto exchange posting adjusted net income of $33 million, or 12 cents per share, compared to$294 million, or $1.10 per share, in the same quarter last year. COIN stock 1-day chart. Source: Google FinanceShares were trading at$320.93, down 15.04% at press time Friday.Why is Coinbase stock down?Coinbase’s troubles centered on weak trading activity as crypto market volatility dropped ...