Verifiable receipt 73a7f656 - prompt_lab result | Zambo

Verifiable receipt for a prompt_lab call on Zambo: {"prompt":"Write a haiku about reliable AI tools that work every time","models_tested":2,"results":[{"model":

Observed result

{"prompt":"Write a haiku about reliable AI tools that work every time","models_tested":2,"results":[{"model":"openai/gpt-oss-20b","response":"Code hums with steady  \nReliable tools guide us  \nEvery task, they shine","latency_ms":938,"tokens":402},{"model":"groq/compound-mini","response":"Rate limited or unavailable — Error: 404 {\"error\":{\"message\":\"The model `groq/compound-mini` does not exist or","latency_ms":0,"tokens":0}]}

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Check this receipt

This record shows the result and timestamp stored for the call. Recompute the SHA-256 commitment from the saved bytes in your browser; signatures and chain proofs are not checked.

Provenance for every timeline entry

EXECUTED BY ZAMBOZambo ran the tool call itself.
OBSERVED VIA GATEWAYA Zambo gateway observed request and response bytes from the named external executor. Zambo did not run that external action.
LOGGED BY AGENTAn agent or local hook reported the action. Zambo attests that the record is unchanged since logging, not that the action happened as described.

Private agent reasoning, built-in client actions, and direct calls to unrelated MCP servers are not included unless an agent or gateway reports them.

What is this?

An AI agent completed a tool call through Zambo, and this page records the result. The SHA-256 hash below fingerprints exactly what the agent produced. The timestamp shows when it ran. The Nostr anchor posts that fingerprint to public relays, so the record exists outside Zambo too. Check the hash yourself.

What is an execution receipt?

An execution receipt is the public record of one completed AI agent tool call. Read the canonical definition of an AI agent execution receipt.

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Verification checks

SHA-256 commitment: Recomputed by the linked API v2 check from the exact decoded bytes
Signature: NOT CHECKED; no Ed25519 signature or pinned key is supplied
Chain: NOT CHECKED; no append-only chain proof is validated
Stored timestamp: 2026-10-05T03:08:33.297Z; external immutability is not checked

Proof of observed execution

EXECUTED BY ZAMBO

Receipt ID: 73a7f656-8a85-4e21-b88f-bf24c6a68b49
SHA-256 output hash: sha256:b82bc46ed553c0c54ad8a49095b435b216fa3f0c3fb38a618ca93130aaf57eb7
Canonical bytes: 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
Timestamp: 2026-10-05T03:08:33.297Z

Bound call context

Receipt schema: 0.3
Tool name: prompt_lab
Tool version: 4.0.0
Permission scope: public
Caller type: anonymous
Caller ID: sha256:462e58a7c71e2908382513a2b3aa6526ad882e315da5746728c943130aea6da4
Declared side effects: none
Side-effects schema: zambo-side-effects/1
Declaration hash: sha256:45aad38f3aa982b9aafe92ecb416ebe98791eddbaf8ab6df0bd08605b7c1bfee

This records what the server-side tool contract declared at call time. It does not independently verify that a downstream side effect happened.

Bound upstream evidence

Status: no_upstream_bytes_captured
Evidence SHA-256: unavailable
Byte length: unavailable

Neutral Nostr anchor

Event ID: d11e09af0b849810fe8a060b5f69cb6ae994263c53653ad9e782b6e54a4dcada
Anchor status: failed
Public key: e13475107d30c918ec664adf2ab1141024a22fb35190f82c9e933704fa49af41

Relay hints: wss://relay.damus.io · wss://nos.lol · wss://relay.primal.net

Schema: zambo-receipt-anchor/1

Anchor envelope bytes:

{"anchored_at":"2026-10-05T03:08:33.280Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:b82bc46ed553c0c54ad8a49095b435b216fa3f0c3fb38a618ca93130aaf57eb7","receipt_uuid":"73a7f656-8a85-4e21-b88f-bf24c6a68b49","schema_version":"zambo-receipt-anchor/1"}

Anchor status "failed": Publication was not confirmed by any configured relay target.

Check this hash yourself

Recompute the SHA-256 commitment in your browser. Open the API v2 JSON response to inspect the machine-readable checks. Signature and chain remain NOT CHECKED unless a real signature verifier or chain proof is supplied. There is no combined “verified” verdict. See the Nostr anchor event on a public viewer. The fingerprint is timestamped outside Zambo too.

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