The clients are just waiting for the lnurl service to publish the zap receipt for the zap that was sent. I think most clients at least verify that the invoice in the receipt matches the invoice from the zap event.
Discussion
Yep, that is how I understand it
So it seems there is actually a way to know precisely enough how many sats have been send through nostr
Not really. Cause anyone can publish zap receipts without zaps even being sent. That’s what nostr:npub1u8lnhlw5usp3t9vmpz60ejpyt649z33hu82wc2hpv6m5xdqmuxhs46turz was trying to explain.