Verifiable receipt fa428feb - receipt_publication result | Zambo

✓ This result hasn’t changed since it was saved.

Saved:
What was asked: The request recorded for this receipt.

Zambo is the verifiable work layer for AI.

Zambo is the verifiable work layer for AI. Verifiable receipt for a receipt_publication call on Zambo: {"schema":"zambo.redacted-receipt-publication/1","redacted_projection":true,"source_receipt_id":"9ca

Observed result

schema: zambo.redacted-receipt-publication/1 redacted projection: true source receipt id: 9ca833e2-af03-469b-9ff7-b3a36e12a3b7 source output hash: sha256:070c24642ad5b291e86e4361f224cf8e72e7bed702932e51bfccbcb9f08466f4 source tool: zambo_check publication notice: This is a newly committed redacted publication copy, not the original tool output. The original commitment is unchanged and its private bytes are withheld. output: {"status":"uncertain","confidence":"medium","reason":"The operation is claimed or observed, not independently verified.","evidence":[{"id":"http_3bed0d1aff8f","kind":"http_observation","source":"https://zambo.dev/","observed":"Public endpoint responded with HTTP 200.","scope":"reachability, response metadata, page title/description, and content hash","fetched_at":"2026-10-03T08:36:59.024Z","http_status":200,"content_type":"text/html; charset=utf-8","sha256":"eeb919943fe16c9f3b94abad5b1b8be365ae74d1863ebafb86c36ed61aae0cc0"},{"id":"observed_78529599b3a6","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":"2026-10-03T08:36:59.054Z","source_count":1,"newest_source_at":"2026-10-03T08:36:59.024Z"},"conflicts":[],"risk":{"level":"high","side_effects":true,"reversible":"[private]","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/"],"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":"9dc1dd5707ae0f6f3625acc5ebb4c6f553466c9b7208633d8d4ed56ba4740f2e","recorded_at":"2026-10-03T08:36:59.054Z","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":30,"tool_calls":0,"upstream_latency_ms":30,"cache_hit":false,"free_limit":"20/day/IP"}}

This is the saved result preview, not proof that the answer was correct.

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Show technical provenance details

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 receipt?

This is a verifiable receipt for a journal entry. It confirms receipt, redaction, timestamping, and chaining. It does not attest to execution.

What the receipt can and cannot prove

What is this?

Zambo's receipt store reports a journal entry from an agent or local hook. The SHA-256 commitment covers the receipt bytes. The provenance label is only a claim, not proof of issuer identity or that the reported action happened.

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Show technical verification checks

Verification checks

  • SHA-256 commitment: Checked independently against the exact decoded bytes
  • Provenance binding: PASS; The metadata claim is consistent with the verified receipt bytes; issuer is not authenticated.
  • Metadata binding: PASS; metadata_hash matches the canonical metadata block.
  • Issuer authentication: NOT CHECKED; no pinned signing key or trusted issuer was supplied
  • Signature: NOT CHECKED; no Ed25519 signature or pinned key is supplied
  • Chain: NOT CHECKED; no append-only chain proof is validated
  • Stored timestamp: 2026-10-20T22:41:14.038Z; external immutability is not checked

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Get receipts for your own AI work: add zambo.dev/mcp

One URL, no key. Copy the line for your AI and add it yourself in its settings.

  • ClaudeSettings, Connectors, Add custom connector, paste the URL.
    https://zambo.dev/mcp
  • ChatGPTSettings, Apps and Connectors, developer mode, create a connector with this URL.
    https://zambo.dev/mcp
  • GrokAdd a remote MCP server in your Grok client and paste the URL.
    https://zambo.dev/mcp
  • CursorPaste into ~/.cursor/mcp.json.
    {"mcpServers":{"zambo":{"url":"https://zambo.dev/mcp"}}}

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Show receipt data and verification evidence

Committed provenance claim

LOGGED BY AGENT

The metadata claim is consistent with the verified receipt bytes; issuer is not authenticated.

Receipt ID
fa428feb-bccc-5dc5-a5f3-9f3bc4185c2b
SHA-256 output hash
sha256:b69cc93fdce2a8dc19fa8523473e5dbb9b9347aeeb3b2704fe5961f40a9c15cf
Canonical bytes
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
Timestamp

Bound call context

Receipt schema
0.4
Tool name
receipt_publication
Tool version
4.0.0
Permission scope
public
Caller type
session
Caller ID
sha256:397556894a8c51a6924ad7dca56b70084cef854978a18cc38b2d039a6bc12c25
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
963a8f658bd2b91c02d5d9bcad56ae3d035bedd294bf2d039069ac84ca957380
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":"2026-10-20T22:41:14.038Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:b69cc93fdce2a8dc19fa8523473e5dbb9b9347aeeb3b2704fe5961f40a9c15cf","receipt_uuid":"fa428feb-bccc-5dc5-a5f3-9f3bc4185c2b","schema_version":"zambo-receipt-anchor/1"}

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

Check this hash yourself

Receipt commitment: commitment matched; issuer, signature and chain not checked. This checks the saved bytes, not whether the answer was correct. Recompute the SHA-256 commitment in your browser. Open the API v2 JSON response to inspect the machine-readable checks. See the Nostr anchor event on a public viewer. The fingerprint is timestamped outside Zambo too.

Embed this receipt

Markdown

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HTML

<a href="https://zambo.dev/run/fa428feb-bccc-5dc5-a5f3-9f3bc4185c2b?ref=badge"><img src="https://zambo.dev/api/receipt/fa428feb-bccc-5dc5-a5f3-9f3bc4185c2b/badge.svg" alt="Verifiable Zambo receipt"></a>

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