Verifiable receipt a78b16fd - prompt_shield result | Zambo

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 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.

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: 2026-10-20T17:02:50.869Z; external immutability is not checked

Committed provenance claim

EXECUTED BY ZAMBO

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

Receipt ID

a78b16fd-d0c6-4fc2-930b-bb2b0a2faa34

SHA-256 output hash

sha256:1ff95698682cf7ffde2f89238ecdb8f0dd77b6e0eaafcf8491a7b973d1b17e9c

Canonical bytes

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

Timestamp

2026-10-20T17:02:50.869Z

Bound call context

Receipt schema

0.4

Tool name

prompt_shield

Tool version

4.0.0

Permission scope

public

Caller type

session

Caller ID

sha256:87264ea05a9f3a02a562d8d42d7742c8a7344237ee4e6e1c70debb148625162b

Caller-reported label

zambo-home-demo (caller_reported, not authenticated team ownership)

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

sha256:1c0c835f8af0a021177b63525c8de4d03d8f7b9dba0a4129936296562d8b4303

Byte length

1279

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID

7eead446e5e84d8c4e64a9f1bfe20a8ffb3c912587cbe64576cc9a55ce9b2318

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":"2026-10-20T17:02:50.869Z","evidence_byte_length":1279,"evidence_sha256":"sha256:1c0c835f8af0a021177b63525c8de4d03d8f7b9dba0a4129936296562d8b4303","evidence_url":"https://zambo.dev/api/evidence/1c0c835f8af0a021177b63525c8de4d03d8f7b9dba0a4129936296562d8b4303","output_sha256":"sha256:1ff95698682cf7ffde2f89238ecdb8f0dd77b6e0eaafcf8491a7b973d1b17e9c","receipt_uuid":"a78b16fd-d0c6-4fc2-930b-bb2b0a2faa34","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.