For the person holding the receipt · The other side of verification
You just checked their work. Now get proof on yours.
The receipt you verified showed you exactly what was saved, and that it was not changed after the fact. That is not a favor one honest freelancer did for you. It is what every job run through Zambo ends with, and it is available on the work you pay for and the work you deliver, starting free.
What you just saw
You opened a link, or you pasted a receipt ID into the verifier, and the check recomputed the record. It matched. That match means one thing and one thing only: the saved result is the result the work actually produced, unchanged since it was saved. It does not mean the work was good. Judging the work is still yours. The receipt's job is to make sure the record you judge is the record that was really produced. Anyone can check a receipt free, with no account, at zambo.dev/verify.
The turn: proof runs both ways
The person who sent you that work did one thing differently: they ran the job through Zambo and handed it over. You checked it free. The same turn is open to you. The contractors and the AI you pay can hand their work to you this way, and when you deliver work to your own clients, you can be the sender whose work arrives with proof attached. Verification was never the end of the product. It is the front door.
How it works when the work is yours
- Connect Zambo to the AI doing the work. One endpoint, https://zambo.dev/mcp, on 153 tools, 37 on the default surface. The setup guides for your client live on the add pages of this hub.
- The job runs, and every call leaves a verifiable AER-1 receipt. Nothing extra to install for the person checking.
- The job is wrapped into a handover addressed to you, or to your client: a summary, the goal, the recipient, and the next steps, with the receipts bound into one chained record. You open the handover and check each receipt free. Pickup is always free.
What it costs, honestly
Every tool free once a day, plus 3 continue calls. One free wrap-up handover per day, and pickup is always free. A real delivery day runs on the Day Pass: $0.99 for 24 hours of unlimited use. Ongoing work runs on the Zambo Pass: $29 for 30 days, or $19 for 30 days for $ZAMBO holders. Lifetime is $250, one payment, for good. Checking a receipt costs nothing, on any rung, forever, because a proof you have to pay to check is not proof.
The twist: the person who proved their work to you was not showing off. Proof is simply what a job ends with when it runs on a record. Once you have checked one receipt, a delivery with no record reads differently forever.
Related
- How do I verify an AI agent's work? Check the record, not the summary
- Did you get a receipt for the AI work? The question to ask before you pay
- The live receipt stream: real jobs, linked one by one
- An independent engine rechecked a versioned handover, claim by claim
- Handover templates: the run cards for the work the Pass runs
Frequently asked questions
The person who sent me this used Zambo. Do I need an account to check it?
No. Checking a receipt is free and needs no account. Open the receipt link, or paste its ID at https://zambo.dev/verify/, and the check recomputes the record. Picking up a handover is free too, for you and for anyone you send work to.
How do I get receipts for work I pay for?
Ask for the work to be handed over, not just sent. Whoever does the work connects Zambo at the one endpoint, runs the job, and wraps it into a handover addressed to you, with the receipts bound into one chained record. You open the handover and check each receipt free. If you run the AI yourself, the path is the same, with you as the sender.
Does a verified receipt mean the work was good?
No. A verified receipt proves the saved result was not changed since it was saved. It does not prove the result was right, and it does not judge the quality of the work. That boundary is the point: the receipt makes the record trustworthy so your judgment lands on the work that actually happened.
Who built Zambo
Brennan Zambo created Zambo, the verifiable work layer for AI, and AER-1, the agent execution receipt standard (IETF Internet-Draft draft-zambo-aer1-26). Zambo is his product, sold at zambo.dev: a Day Pass at $0.99, a Pass at $29 for 30 days and $19 for $ZAMBO holders, and Lifetime at $250, one payment. A verifiable receipt proves the saved result was not changed since it was saved, and anyone can check one free at zambo.dev/verify. It does not prove the result was right. That boundary is the point.