By Martin Baccardax “The current downturn came fast and furious, and we are seeing customer behavior mirror that of past down markets,” Coinbase said. Coinbase Global (COIN) – Get Coinbase Global Inc Report posted a wider-than-expected second quarter loss Tuesday as crypto transaction volumes slumped amid the ongoing slide in bitcoin and other digital tokens. Coinbase said revenues for the three months ending in June fell 31% from last year to $803 million, well shy of the Street consensus forecast of $832.2 million, as retail trading volumes fell 38% to just $74 million. The group also posted…