Verifiable receipt 5f618b44 - zambo_universal result | Zambo

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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 zambo_universal call on Zambo: {"status":"executed","executed":true,"primary_tool":"write","executed_tools":["write"],"result":"Subject

Observed result

status: executed executed: true primary tool: write executed tools 1: write result: Subject: Outstanding Invoice – Request for Immediate Settlement Dear [Client Name], I am writing to remind you that Invoice #12345, issued on [Date], remains unpaid. The total balance of $2,350 reflects the design work completed and delivered on [Delivery Date], as outlined in our agreement. Thirty days have elapsed since the invoice date, and the payment deadline has passed. I understand that administrative delays happen, but I kindly ask you to settle the outstanding amount at your earliest convenience. Prompt payment will help keep both of our projects on schedule and maintain the smooth flow of our collaboration. Here is a quick recap of the invoice details: - **Invoice Number:** 12345 - **Issue Date:** [Date] - **Due Date:** [Date] – 30 days after issue - **Amount Due:** $2,350 - **Payment Method:** [Preferred Method – e.g., bank transfer, PayPal, etc.] The design files, including the final high-resolution assets and source files, were delivered via the agreed-upon platform on [Delivery Date]. All deliverables were accepted and approved in your confirmation email dated [Approval Date]. I trust you are satisfied with the results and ready to move forward. If you have already processed the payment, please disregard this notice and accept my thanks. If the payment is still pending, please let me know if you require any additional documentation, such as a copy of the invoice, a breakdown of charges, or a revised payment schedule. I am happy to accommodate any reasonable requests. To streamline the process, I have attached the original invoice PDF to this email. The file includes the bank details and payment instructions for your reference. If you prefer to pay via an online payment portal, you can do so by following the link below: [Insert Payment Link] When you complete the payment, kindly send a confirmation email with the transaction reference number. This will allow me to reconcile the accounts quickly and issue a receipt for your records. I value our partnership and the creative work we have produced together. Resolving this payment promptly will ensure that our future projects continue without interruption. Should you foresee any complications or need additional time, please contact me directly by [Phone Number] or reply to this email before [Date], so we can discuss an alternative arrangement. Thank you for your attention to this matter. I look forward to your swift response and to the continued success of our collaboration. Best regards, [Your Full Name] [Your Title / Freelance Design Specialist] [Your Business Name] [Phone Number] [Email Address] [Website URL]

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 an execution receipt?

An execution receipt is a public record of a reported AI agent tool call. Its byte commitment and provenance claim can be checked independently; neither alone authenticates the issuer. Read the canonical definition of an AI agent execution receipt.

What the receipt can and cannot prove

What is this?

Zambo's receipt store reports a tool call and records its result. The SHA-256 commitment covers the exact canonical bytes. The provenance label is bound to v0.4 receipt bytes when that check passes, but no pinned signature or trusted issuer key is checked. An anchor can timestamp a fingerprint; it does not authenticate the issuer.

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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: 2026-10-17T13:01:57.779Z; 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

EXECUTED BY ZAMBO

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

Receipt ID
5f618b44-4c22-4544-9b0f-f0ee6c213ed8
SHA-256 output hash
sha256:6a74c773f20f61f08cd3a1d85bbc8d04aa66cf48f10db470adfa1f819c8d8da7
Canonical bytes
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
Timestamp

Bound call context

Receipt schema
0.4
Tool name
zambo_universal
Tool version
4.0.0
Permission scope
public
Caller type
session
Caller ID
sha256:d77be481667054d031eee50f69b52ea338f89f51ed0b59481306e9aa469f7d95
Declared side effects
state_write
Side-effects schema
zambo-side-effects/1
Declaration hash
sha256:dfb4412aa429d3ac637a05668c435bcc90a251363fcdd49f7b85ae4ab55b5bc9

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
07967f766dc567e3eb2db78281eb0cb95afbed35590fefbef9ade16fc5f45872
Anchor status
partial
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":"2026-10-17T13:01:57.779Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:6a74c773f20f61f08cd3a1d85bbc8d04aa66cf48f10db470adfa1f819c8d8da7","receipt_uuid":"5f618b44-4c22-4544-9b0f-f0ee6c213ed8","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

API v2 status: verified. This status summarizes the v2 commitment and provenance checks; it does not prove 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.

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Markdown

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HTML

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