Verifiable receipt f7b74412 - 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: 2026-10-16T08:11:37.896Z; 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

f7b74412-5cc1-4eac-8cc0-c5542adfb640

SHA-256 output hash

sha256:55f6a8d83491ecea1caa07c0fefa5e2b0b188bfae060e8ff8c33030b59df5186

Canonical bytes

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

Timestamp

2026-10-16T08:11:37.896Z

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:c0a1fe8cf9eeec229f78495f15930747f9649916b35cd42afbbe42d271e06c16

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:f3aae078c9b03e2278a40b43caf9a714acf204084861c31af3ab3cf16edaf4d6

Byte length

1028

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID

f346a357b8e71ea2ae1445300b639f351b8a7ecd2956a8b961e581b218f19f0f

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":"2026-10-16T08:11:37.896Z","evidence_byte_length":1028,"evidence_sha256":"sha256:f3aae078c9b03e2278a40b43caf9a714acf204084861c31af3ab3cf16edaf4d6","evidence_url":"https://zambo.dev/api/evidence/f3aae078c9b03e2278a40b43caf9a714acf204084861c31af3ab3cf16edaf4d6","output_sha256":"sha256:55f6a8d83491ecea1caa07c0fefa5e2b0b188bfae060e8ff8c33030b59df5186","receipt_uuid":"f7b74412-5cc1-4eac-8cc0-c5542adfb640","schema_version":"zambo-receipt-anchor/1"}

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

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.