A co-founder of Tornado Cash, a digital-currency “mixing” service that was used by North Korean cybercriminals to launder stolen funds, was convicted of one of the three criminal charges he had faced, after a three-week trial in New York federal court.

A U.S. jury deadlocked on Wednesday on money laundering and sanctions evasion charges against the founder of Tornado Cash, a firm that makes cryptocurrency transactions harder to track.The jury in Manhattan federal court could not reach a verdict on charges Roman Storm conspired to launder the proceeds of hacks,

Tornado Cash co-founder Roman Storm has been found guilty of conspiracy to operate an unlicensed money transmitting business, while the jury wasn’t unanimous on the other two counts that the developer faced.