A former employee of the NFT exchange OpenSea was sentenced to three months in federal prison Tuesday after he was found guilty of wire fraud and money laundering in what the U.S. Attorney’s Office for the Southern District of New York described as the first-ever prosecution in a “digital asset insider trading scheme.”

The sentence was significantly lower than the 21 to 27 months sought by the U.S. Attorney’s Office for the Southern District of New York, with U.S. District Judge Jesse Furman of the Southern District of New York finding a number of mitigating factors in favor of defendant Nate Chastain, 33.