The 'thing' that becomes money doesn't have to have a real world use. It must be desired by some people. People can desire bitcoins expecting it to become a widely used currency. Yes, it's circular, but there's nothing preventing a self-fulfilling prophecy from being compatible with the regression theorem.
Now, if you absolutely need to have some kind of basic usage to feel better, know that to use the Bitcoin blockchain, you must pay a fee in bitcoins. A bitcoin enables you to use the blockchain, the world's most secure distributed financial database.
The 'thing' that becomes money doesn't have to have a real world use. It must be desired by some people. People can desire bitcoins expecting it to become a widely used currency. Yes, it's circular, but there's nothing preventing a self-fulfilling prophecy from being compatible with the regression theorem.
Now, if you absolutely need to have some kind of basic usage to feel better, know that to use the Bitcoin blockchain, you must pay a fee in bitcoins. A bitcoin enables you to use the blockchain, the world's most secure distributed financial database.