SAN FRANCISCO — A federal judge on Friday selected the firms LTL Attorneys and Hung G. Ta, Esq. to lead a group of groundbreaking securities class actions over digital tokens against the blockchain startup Tezos.

U.S. District Judge Richard Seeborg of the Northern District of California ruled that the attorneys met the requirements to lead the suits under the Private Securities Litigation Reform Act (PSLRA)—including that their client has the largest financial stake in the case. Their client is Arman Anvari, a former Perkins Coie associate in Chicago who says he poured $264,007.50 worth of ether into Tezos.