> I have no clue how it works with blockchain thingies This has nothing to do with blockchains. All exchange transactions that I know of happen off-chain. (Thi

> I have no clue how it works with blockchain thingies This has nothing to do with blockchains. All exchange transactions that I know of happen off-chain. (This is not a criticism of anything you said; rather, it's a confirmation that your experience and knowledge do transfer to this situation.)