Ya'll aren't thinking this through. Suppose I want to map an XMR->BTC converter. I sign up for the converter, and say "Here's some XMR. Give me BTC." At that

Ya'll aren't thinking this through. Suppose I want to map an XMR->BTC converter. I sign up for the converter, and say "Here's some XMR. Give me BTC." At that point, some BTC wallet gives me BTC. I now know which wallet is being used by the XMR converter. And I know all the other metadata as a result.