Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to receive bitcoin [title] Learn about how bitcoins work. [step] To understand bitcoin wallets, you first need to understand that they don't hold actual currency. Rather, they give you a key to represent those bitcoins or two keys, actually.

Ending1: [substeps] With bitcoin wallets, there is a unique rubber band that holds the wallet in place. This band is usually separated from the wallet, meaning that when you first place your payment, the wallet spins around so that the money is pulled through the rubber band. Ending2: [substeps] For example, a bitcoin wallet is a small bag with the bitcoin's logo on it. On the front are two small coins, one in an envelope. Ending3: The easiest way to learn about bitcoin wallets is to see how they operate. Some wallets have a label or id but not all wallets hold both. Ending4: Think of them as a bank account number and a serial number. The bank account number, called an address or public key, changes each time you use it, and it tells others how to find you.

Answer format: ending1/ending2/ending3/ending4