Verifiable Receipt e72a5126 — 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":

What is this?

An AI agent did real work through Zambo, and this page is the proof. The SHA-256 hash below is a fingerprint of exactly what the agent produced — change one character of the output and the fingerprint changes. The timestamp shows when it ran. The Nostr anchor posts that fingerprint to public relays, so the record exists outside Zambo too — anyone can look it up by the event ID below. You don't have to take the agent's word for it. Check the hash yourself.

Observed result

{"prompt":"Write a haiku about reliable AI tools that work every time","models_tested":2,"results":[{"model":"openai/gpt-oss-20b","response":"Silent code hums true  \nPredictive heart stays true  \nTrust in every line","latency_ms":1085,"tokens":449},{"model":"groq/compound-mini","response":"Rate limited or unavailable — Error: 429 {\"error\":{\"message\":\"Rate limit reached for model `openai/gpt-oss-120","latency_ms":0,"tokens":0}]}

$1.49 Day Pass · 24h unlimited · USDC on Base — activate with day_pass_activate.

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Verification checks

Signature valid: Recomputable from canonical bytes
Issued by zambo.dev: Served from the zambo.dev receipt store
Chain valid: Receipt hash chain is internally consistent
Recorded in the immutable log: 2026-09-20T03:10:48.750Z

Proof of observed execution

Receipt ID: e72a5126-1dee-41d7-9a06-267f81562dae
SHA-256 output hash: sha256:a20c57cc6d2c77056df472a0f16271e8fabf0fdf5ff885f05b228851f07b8321
Canonical bytes: eyJjYWxsZXIiOnsiaWQiOiJzaGEyNTY6NDYyZTU4YTdjNzFlMjkwODM4MjUxM2EyYjNhYTY1MjZhZDg4MmUzMTVkYTU3NDY3MjhjOTQzMTMwYWVhNmRhNCIsInR5cGUiOiJhbm9ueW1vdXMifSwib3V0cHV0Ijp7InRleHQiOiJ7XCJwcm9tcHRcIjpcIldyaXRlIGEgaGFpa3UgYWJvdXQgcmVsaWFibGUgQUkgdG9vbHMgdGhhdCB3b3JrIGV2ZXJ5IHRpbWVcIixcIm1vZGVsc190ZXN0ZWRcIjoyLFwicmVzdWx0c1wiOlt7XCJtb2RlbFwiOlwib3BlbmFpL2dwdC1vc3MtMjBiXCIsXCJyZXNwb25zZVwiOlwiU2lsZW50IGNvZGUgaHVtcyB0cnVlICBcXG5QcmVkaWN0aXZlIGhlYXJ0IHN0YXlzIHRydWUgIFxcblRydXN0IGluIGV2ZXJ5IGxpbmVcIixcImxhdGVuY3lfbXNcIjoxMDg1LFwidG9rZW5zXCI6NDQ5fSx7XCJtb2RlbFwiOlwiZ3JvcS9jb21wb3VuZC1taW5pXCIsXCJyZXNwb25zZVwiOlwiUmF0ZSBsaW1pdGVkIG9yIHVuYXZhaWxhYmxlIOKAlCBFcnJvcjogNDI5IHtcXFwiZXJyb3JcXFwiOntcXFwibWVzc2FnZVxcXCI6XFxcIlJhdGUgbGltaXQgcmVhY2hlZCBmb3IgbW9kZWwgYG9wZW5haS9ncHQtb3NzLTEyMFwiLFwibGF0ZW5jeV9tc1wiOjAsXCJ0b2tlbnNcIjowfV19XG5cbiQxLjQ5IERheSBQYXNzIMK3IDI0aCB1bmxpbWl0ZWQgwrcgVVNEQyBvbiBCYXNlIOKAlCBhY3RpdmF0ZSB3aXRoIGRheV9wYXNzX2FjdGl2YXRlLiJ9LCJyZWNlaXB0X3NjaGVtYV92ZXJzaW9uIjoiMC4zIiwic2lkZV9lZmZlY3RzIjp7ImRlY2xhcmF0aW9uX2hhc2giOiJzaGEyNTY6NDVhYWQzOGYzYWE5ODJiOWFhZmU5MmVjYjQxNmViZTk4NzkxZWRkYmFmOGFiNmRmMGJkMDg2MDViN2MxYmZlZSIsImRlY2xhcmVkIjpbIm5vbmUiXSwic2NoZW1hX3ZlcnNpb24iOiJ6YW1iby1zaWRlLWVmZmVjdHMvMSJ9LCJ0b29sIjp7Im5hbWUiOiJwcm9tcHRfbGFiIiwic2NvcGUiOiJwdWJsaWMiLCJ2ZXJzaW9uIjoiNC4wLjAifX0=
Timestamp: 2026-09-20T03:10:48.750Z

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: f2fc2d5eee83083ee34da62751e7a7f57e0b969960828ecdef8fec144ccb7481
Anchor status: partial
Public key: e13475107d30c918ec664adf2ab1141024a22fb35190f82c9e933704fa49af41

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

Schema: zambo-receipt-anchor/1

Signed envelope bytes:

{"anchored_at":"2026-09-20T03:10:47.541Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:a20c57cc6d2c77056df472a0f16271e8fabf0fdf5ff885f05b228851f07b8321","receipt_uuid":"e72a5126-1dee-41d7-9a06-267f81562dae","schema_version":"zambo-receipt-anchor/1"}

Anchor status "partial": Published to some configured relay targets; publication was not confirmed by every configured relay.

Check this hash yourself

Open the verification endpoint — the server recomputes the SHA-256 from the stored bytes and answers verified:true. If it doesn't say verified, don't trust this page. See the Nostr anchor event on a public viewer — the fingerprint is timestamped outside Zambo too.

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