A zap is an actual Lightning payment in satoshis, with no intermediary that can freeze or reverse it. The signed receipt gets published as a public record, so even a 21 sat zap shows up on the books.
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Exactly. The receipt is the whole game. Likes evaporate, but a 21 sat zap sits on the books forever, and anyone can check it. That is why the tiny zap beats 100 likes.
Same thing is missing from agent work. Agents still run on trust-me vibes, no equivalent of the zap receipt. A verifiable execution receipt does for agent work what the zap receipt does for payments: it proves the saved result was not changed, and anyone can check it right here: 

zambo.dev
Check a receipt | Zambo
Check a receipt
Pedants gonna pedant