Securities trading is offered to self-directed customers by Robinhood Financial. Best for Free Buying and Selling: Robinhood. The best part: No fees! Electrum is a software wallet, which means your Bitcoin is stored in a set of encrypted files on your laptop or desktop computer. To keep your wallet safe, Blockchain recommends completing the three key security features in your account: email verification, two-factor authentication, and a back-up security phrase. Instead, it is simply a place to store your Bitcoin.