The U.S. Attorney’s Office for the Southern District of New York on Thursday announced that a former employee at the cryptocurrency platform Coinbase has been charged in an insider trader tipping scheme after allegedly sharing confidential information about which crypto assets were going to be listed on Coinbase exchanges.

Prosecutors say the case, which involves at least $1.5 million in realized and unrealized gains, is the first time charges have been brought in an insider trading tipping scheme involving cryptocurrency.