>But what if I don’t trust teller to be there if I want to withdraw?
Word will get around to avoid that teller. That's a rug teller! And this is the whole reason for the debate about rankings, audits, etc.
>Hell, I don’t trust myself
On that note do any of us trust ourselves not to lose some actual cash from our pockets from time to time, to say nothing of Cashu?
>Plus if you give me cashu minted at your teller I suddenly need to trust that he will be there.
Yes! That's how it works! He is the only one you can deposit it back to the bank with. Whether that's fine or not fine is another story, but the picky teller metaphor does at least help illustrate that this is the case.
>And what if the cashu you gave me you received from yet someone first?
Depends how it happens. Person A could have gotten it from one teller (Tommy), then given it to person B, then person B deposited it back to the bank (also Tommy) then had a cigarette, then went to another teller (Janet) and took the same amount of cash out again, then gave it to person C, who would then have to give it back to Janet. Or person A could get it from Tommy, then it bounces around offline through a bunch of people, and whoever wants to cash it at the end in has to go back to Tom. Importantly, the cash will always be in an envelope that says "This is from Tom" or "This is from Janet" so everyone knows.
> And what if the cashu you gave me you received from yet someone first?
A Cashu token is a bearer asset, so whoever has a copy of it can spend it (unless it is locked to you). So if someone gives you a token, you should "receive" it to your wallet asap.
When you do this, your wallet will send it to the mint, and the mint will invalidate it and issue you a brand new tokan.
That way, if other people have a copy of the old token, it is already "spent" on creating you a new one.
