Coinbase requires you to associate your bank account or credit or debit card with your Coinbase account to purchase cryptocurrencies. Use a bank account to allow a higher limit ($100/transaction, $2,500/week), but it takes longer to verify the transaction, so it takes two to four days for you to see the money in Coinbase wallet (depending on your bank). When selling Bitcoin, once the sale is confirmed, it will take two to four days for the proceeds to be displayed in your bank account. Use a credit or debit card with a lower limit ($200 a week), but you only need to transfer funds from the bank account to the website to buy digital currency. For these transactions, Bitcoin will immediately appear in your Coinbase wallet. You can also sell Bitcoin to your PayPal account and cash it in practice because your Bitcoin will be exchanged for local currency. This transaction is also instantaneous. Most of us don't have the technical funds to communicate with blockchain or store our digital currency; this is where Coinbase is used. Despite the complex technology and necessity related to cryptocurrency investment, speculation and possession, Coinbase has created a device that makes the process simple and familiar, almost like buying and selling stocks.