Users cannot sell bitcoin or deposit money into their bank account when their wallet is connected to a debit card. Why People Buy Cryptocurrency. It may seem hard to believe that a digital currency could be worth thousands of dollars. Although Coinbase only trades in five cryptocurrencies—Bitcoin, Bitcoin Cash, Ethereum, Litecoin, and Ethereum Classic—the exchange offers a way to securely buy and store cryptocurrency in one location. You have all these people, all over the world, who have bitcoin. It follows the ideas set out in a whitepaper by the mysterious Satoshi Nakamoto, whose true identity has yet to be verified. Your bitcoin exchange and bitcoin wallet do not need to be the same.