Verifiable receipt c599acf1 - zambo_check result | Zambo

Verifiable receipt for a zambo_check call on Zambo: {"status":"uncertain","confidence":"medium","reason":"The operation is claimed or observed, not independentl

Observed result

{"status":"uncertain","confidence":"medium","reason":"The operation is claimed or observed, not independently verified.","evidence":[{"id":"http_1bedc984588d","kind":"http_observation","source":"https://zambo.dev/verify/","observed":"Public endpoint responded with HTTP 200.","scope":"reachability, response metadata, page title/description, and content hash","fetched_at":"2026-10-03T10:10:30.811Z","http_status":200,"content_type":"text/html; charset=utf-8","sha256":"8486efb98b266d82b8219db8381f029dae519ee6f71862cecb8e5d1a9e31bff9"},{"id":"observed_4e752cafeea6","kind":"execution_receipt","observed":"The supplied context indicates the operation was observed, but does not establish independent verification.","scope":"host-reported execution state"}],"assertion_state":{"claimed":false,"observed":true,"verified":false,"scope":"not independently verified"},"freshness":{"checked_at":"2026-10-03T10:10:30.912Z","source_count":1,"newest_source_at":"2026-10-03T10:10:30.811Z"},"conflicts":[],"risk":{"level":"high","side_effects":true,"reversible":"unknown","authorization":"unknown","approval_required":true,"reasons":["The request concerns an external action or execution; Zambo does not authorize it from a natural-language request alone."]},"provenance":{"method":"deterministic observations plus caller-supplied context","sources":["https://zambo.dev/verify/"],"limitations":["A reachable source is not proof that its claims are true.","Caller-supplied claimed/verified fields are not independently authenticated."]},"recommended_action":"verify_more","next_action":"verify","proof":{"type":"integrity_hash","hash":"80126994ab8e50b4a76fa7b3e3e5486068f240e3ad1f9f929dabfed94ee006e4","recorded_at":"2026-10-03T10:10:30.912Z","scope":"integrity of this check response and its observed evidence; not a universal truth certificate","independently_verifiable":false,"note":"This hash is not a persisted proof certificate. Use the dedicated proof capability only when a durable certificate is explicitly requested."},"next_capability":"zambo_check","zambo":{"capability":"zambo_check","next_capability":"zambo_check","mcp_available":true},"meta":{"check_type":"execution","latency_ms":101,"tool_calls":0,"upstream_latency_ms":101,"cache_hit":false,"free_limit":"20/day/IP"}}

Verify this receipt

This is a verifiable receipt: the result above is hashed and timestamped at a permanent URL.

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

Integrity check: 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: 2026-10-03T10:10:31.083Z

Proof of observed execution

EXECUTED BY ZAMBO

Receipt ID: c599acf1-d3ac-4cfa-93cf-99a76ace8964
SHA-256 output hash: sha256:ffe921605f4a8f33e139fbda87f2155b0cabe1593c8e763dc6172269d3a9cafb
Canonical bytes: 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
Timestamp: 2026-10-03T10:10:31.083Z

Bound call context

Receipt schema: 0.3
Tool name: zambo_check
Tool version: 4.0.0
Permission scope: public
Caller type: anonymous
Caller ID: sha256:c41000a3e61f8912eafe8df7d15d9e4a7bc2544d927940cd158a3834b082164a
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: captured
Evidence SHA-256: sha256:b4bc711fc1082ca4f76e7ed259b897398955a0a393460eebdeb1e6e62a841541
Byte length: 2275

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID: 8b25d774c94ae71867ca6548ff4c3d2cb0d7810171adf5af7900c0c35d33094f
Anchor status: published
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":"2026-10-03T10:10:31.055Z","evidence_byte_length":2275,"evidence_sha256":"sha256:b4bc711fc1082ca4f76e7ed259b897398955a0a393460eebdeb1e6e62a841541","evidence_url":"https://zambo.dev/api/evidence/b4bc711fc1082ca4f76e7ed259b897398955a0a393460eebdeb1e6e62a841541","output_sha256":"sha256:ffe921605f4a8f33e139fbda87f2155b0cabe1593c8e763dc6172269d3a9cafb","receipt_uuid":"c599acf1-d3ac-4cfa-93cf-99a76ace8964","schema_version":"zambo-receipt-anchor/1"}

Anchor status "published": Published to all configured relay targets.

Check this hash yourself

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

Embed this receipt

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