The New York Council of Defense Lawyers on Wednesday filed an amicus brief in what the U.S. Attorney’s Office for the Southern District of New York has described as the first-ever criminal case related to digital asset insider trading, arguing that the government is relying on an “unprecedently broad theory of property fraud.”

The NYCDL urged U.S. District Judge Jesse Furman of the Southern District of New York to dismiss the indictment against Nathaniel Chastain, a former product manager at the non-fungible token—or NFT—marketplace OpenSea.