If you want to own Bitcoins or any other cryptocurrency, you need to have a digital wallet. The purpose of a digital wallet is to provide a space to send and receive cryptocurrency and to store private keys. Private keys are known only to the owner and are needed to authorize transfers. In the cryptocurrency system, a user’s “wallet” or account address has a public key (like a bank account number). The private key (like your ATM PIN number) is known only to the owner and is used to sign transactions.