To OP - of course they exchange numbers. That's why it is a DIGITAL currency. If they exchanged something other than numbers, it would be analog.
Currency is a word. They don't exchange word but numbers. You talk nonsense.
I hope you are sweating somewhere with your little nylon tie nailed to a counter in a bank with Warren Buffet farting in your mouth.

You cannot insult me with things that you create in your imagination. All you do in that way is presenting yourself. But I think that nobody here is interested in your fantasies about Warren Buffet farting.
You are George Soros's PA, & your anus is in tatters.
So, how do you comment the fact that you people are investing labour, goods, services, products, assets and other resources in order for Nakamoto's system to write down next to your addresses that they own a specific amount of bitcoins, although bitcoin (chain of digital signatures) is only one and free for everyone to download?