Fidelity’s cryptocurrency unit only serves institutional investors such as hedge funds, family offices and intermediaries. : Fidelity Digital Assets, the cryptocurrency arm of Boston-based Fidelity Investments, has expanded its cryptocurrency trading and custody services to companies based in Europe. Fidelity Digital Asset Services (FDAS) is establishing a new entity to serve European institutions investing in digital assets, it said in a corporate statement Tuesday. Fidelity’s cryptocurrency unit only serves institutional investors such as hedge funds, family offices and market intermediaries.