A zap is a lightning payment where you get a receipt on nostr, clients can then display totals

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oh thats what ive been doing all day, going around tipping people not knowing i was zapping them. dont tell my wife

Is there a cryptographic proof involved that allows clients to verify the receipt?

There is a proof that the lnurl service says that it was paid, you need to trust those services not to create fake zap receipts there is no concrete proof of payment in LN