BlockFi offers you a way to buy, sell, and trade cryptocurrency, but assets aren’t protected by the FDIC or SIPC. Assets at BlockFi are held at trusted custodians, including with Gemini. BlockFi offers some security measures like allowing you to designate specific wallet addresses for withdrawal and two-factor authentication. There was a hack of BlockFi using a SIM swap, but BlockFi says no funds were lost, and that the hacker was unsuccessful in attempts to access client assets.