# Receipt use cases: six problems a zambo receipt solves

A zambo receipt proves the saved result was not changed since it was saved. It never proves the answer was right. What it removes is the argument about what happened, and that argument is the expensive part of six everyday problems. Each one below is solved on its own page with a real run, every receipt linked and checkable at https://zambo.dev/verify/.

- HTML version: https://rambozambodotdev.gitlab.io/aer1-hub/receipt-use-cases.html
- Start free: https://zambo.dev/add/
- Endpoint: https://zambo.dev/mcp
- Verify any receipt: https://zambo.dev/verify/

Updated November 2, 2026. First published November 2, 2026. Every worked example is a real run executed against the live service on November 2, 2026. Author: Brennan Zambo.

## The six problems

1. **My client says I never delivered the work.** Deliver inside one record and answer with a link: brief, draft, and delivered revision as receipted steps in one handover the client signed off on. Page: https://rambozambodotdev.gitlab.io/aer1-hub/client-says-i-never-delivered-the-work.html · Run: https://zambo.dev/handover/36b6651f-672e-4b33-8934-139876a02300 (4 steps, 4 of 4 checked, accepted)
2. **My AI said the task was done, but was it.** Split the report into claims; a claim stands only with a step whose receipt verifies, absent counts as not done. Page: https://rambozambodotdev.gitlab.io/aer1-hub/my-ai-said-the-task-was-done-but-was-it.html · Run: https://zambo.dev/handover/da8900bb-880c-460a-b478-1dc482a89232 (two claims backed, one absent)
3. **Two agents disagree about what the data said.** Rule from the saved record: $76,703.00 saved against $80,538.15 in circulation. Page: https://rambozambodotdev.gitlab.io/aer1-hub/two-agents-disagree-about-what-the-data-said.html · Run: https://zambo.dev/handover/c8c66abc-ad0c-4dc2-835c-665e61c19803 (14 steps)
4. **My boss needs an audit trail of what the agent did.** One job, every call and decision a step, wrapped as one packet an auditor walks. Page: https://rambozambodotdev.gitlab.io/aer1-hub/my-boss-needs-an-audit-trail-of-what-the-agent-did.html · Run: https://zambo.dev/handover/830c3ed8-8752-45bb-be03-539132e41df3 (9 steps, 9 of 9 verified by a second identity)
5. **The agent watched the price, but I cannot prove what it saw.** Save every reading with its receipt, baseline and rule included. Page: https://rambozambodotdev.gitlab.io/aer1-hub/the-agent-watched-the-price-but-i-cannot-prove-what-it-saw.html · Run: https://zambo.dev/handover/83809882-1f02-4660-a156-749f0898c393 (baseline $76,708.00, check $76,743.00, +0.046 percent, no flag)
6. **I switched AIs and lost the thread of the job.** Wrap at the pause; the next AI picks the record up free and continues the same job. Page: https://rambozambodotdev.gitlab.io/aer1-hub/i-switched-ais-and-lost-the-thread-of-the-job.html · Run: https://zambo.dev/handover/e5228a67-b511-47d4-9f9d-cd794aec242e (17 steps, one thread across two AIs)

## The patterns underneath, as installable packages

- Swarms: `pip install zambo-swarm` or `npm install zambo-swarm` · https://rambozambodotdev.gitlab.io/aer1-hub/swarm-coordination-on-zambo.html
- The daily loop: `npm install zambo-loop` · https://rambozambodotdev.gitlab.io/aer1-hub/daily-loop-package.html
- The verify pass: `pip install zambo-verify-pass` or `npm install zambo-verify-pass` · https://rambozambodotdev.gitlab.io/aer1-hub/verify-pass-package.html
- Delivery proof: `pip install zambo-delivery` or `npm install zambo-delivery` · https://rambozambodotdev.gitlab.io/aer1-hub/delivery-proof-package.html
- Signal watch: `pip install zambo-watch` or `npm install zambo-watch` · https://rambozambodotdev.gitlab.io/aer1-hub/signal-watch-package.html

## Frequently asked questions

**What problems does a zambo receipt solve?** The ones where the argument about what happened is the expensive part: a client denying delivery, a done report nobody can check, two agents holding two versions of a figure, an audit with no trail, a watch nobody can prove, and a job whose thread dies in a chat you left. Each page in this index solves one completely, with a real run.

**What does a receipt actually prove?** That the saved result was not changed since it was saved. Never that the answer was right or the work was good. The six problems here are all settled by the first property alone, which is why they were chosen.

**What does it cost to start?** Free: 20 calls + 1 wrap-up free every day per identity, picking up in another AI always free, at https://zambo.dev/add/. Past free, a Day Pass is $0.99 for 24 unlimited hours and the Zambo Pass is $29 for 30 days, one-time payments, never subscriptions.

For work that runs past one day: a Day Pass ($0.99) is unlimited for 24 hours. Ongoing access is the Zambo Pass: $29 for 30 days or $290 for 365 days, one-time payments, never a subscription, and $19 for 30 days for $ZAMBO holders, on the same endpoint, with a verifiable receipt on every call. Pricing: https://zambo.dev/pricing/

Zambo, the verifiable work layer for AI. https://zambo.dev/ · MCP endpoint https://zambo.dev/mcp · AER-1 draft https://datatracker.ietf.org/doc/draft-zambo-aer1/26/