By Ellen Chang Three men were charged in what authorities said was the first cryptocurrency insider trading case. A former Coinbase (COIN) – Get Coinbase Global Inc Report employee and two other men were arrested and charged in what authorities said was the first insider-trading case tied to cryptocurrency. The U.S. attorney for the Southern District of New York and the FBI allege that the men used confidential information from Coinbase, a cryptocurrency exchange, about which crypto assets were intended to be listed on its exchange. Ishan Wahl, a formerproduct manager at Coinbase, his brother …