yea i thought of having some sort of tiny hint in op_return, but then the sender would need to use a wallet that does this which brings it closer to what Bitcoin SP does kind of in terms of needing to use a wallet that supports Bitcoin SP flow. Also I don't think I can add stuff in other chains nessarily? I guess where I'm going with this is: Discover valid sends > save them in your own nip78 > empty them out > clean up The sender, assuming a nostr user utilizing a client/signer that supports this, would also have his own nip78 of what he sent (same cleanup of empied balances) as another just-in-case sort of thing where he can rebroadcast or republish if the event got lost. Is there a risk? yup, but hey draft 1 or something x3 I'll probably add a warning on this NSP page in this signer mention the loss risk.