Is it possible to, without any extra knowledge, send a transaction back to whoever sent you monero?
In say, bitcoin, I know the address of whoever sent me btc, so I can send something back to them without them providing us their address “explicitly”. Can something similar be done in the monero protocol?
Don’t see how it would, if party A can send funds anonymously to party B, then why can’t party B send funds anonymously to party A. A simple implementation would be to just put a new “(return) address” with each transaction.
Indeed would introduce blockchain bloat. I do feel that this might be an important feature though. Say I need to pay before I can fill up my car, no one knows exactly how much gas I will be buying. I"d like to pay 1XMR and have the unused remainder sent back to me. Sure, not fully trustless but fine for small transactions.