Trading bitcoin on an insecure or public wifi network is not recommended and may make you more susceptible to attacks from hackers. Once your purchase is complete, the codes are now owned by you and not the seller. In order to purchase bitcoin, you need to connect your wallet to a bank account, debit card , or credit card. Why People Buy Cryptocurrency. These datacenters are warehouses , filled with computers built for the sole purpose of mining Bitcoin. It may seem hard to believe that a digital currency could be worth thousands of dollars.