Fintech firm tZERO Group Inc. said it has received approval from U.S. regulators to become a special-purpose broker-dealer for "digital asset securities custody," the second company to receive the license. The Securities Exchange Commission and the Financial Industry Regulatory Authority have given tZERO approval to custody digital assets, according to a statement released by the company on Tuesday. Previously, digital asset firm Prometheum received similar approval from the Securities Exchange Commission last year, and later from the U.S. Financial Industry Regulatory Authority to provide digital asset securities clearing and settlement services through its special purpose broker-dealer license.