Handover · saved and checkable

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: 2026-10-31T06:36:59.795Z; 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

680987ec-2152-4f43-b944-feadec12434a

SHA-256 output hash

sha256:cd6c978affba369519dcbdd5b2c458c20932989950620eecc67de81e3a54fd80

Canonical bytes

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

Timestamp

2026-10-31T06:36:59.795Z

Bound call context

Receipt schema

0.4

Tool name

handover

Tool version

4.0.0

Permission scope

public

Caller type

api_key

Caller ID

sha256:697c964ca09aeb8a18ce506bde05ea2753f396d75136a4199eddeca5332a9f58

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

ok

Evidence SHA-256

sha256:f253daeb3649a8423cf6f486dbe45d87e7283cb8194af643bc6fcbb24b029b1f

Byte length

752

Fetch exact evidence bytes

Upstream provenance

This receipt is independently auditable against the named upstream source. This is not a mathematical correctness claim.

• Source: · queried at: · raw response hash:

Neutral Nostr anchor

Event ID

27dbc2066ef9176a89a18874a097b1595df3735a394946875d94071221d1ea93

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":"2026-10-31T06:36:59.795Z","evidence_byte_length":752,"evidence_sha256":"sha256:f253daeb3649a8423cf6f486dbe45d87e7283cb8194af643bc6fcbb24b029b1f","evidence_url":"https://zambo.dev/api/evidence/f253daeb3649a8423cf6f486dbe45d87e7283cb8194af643bc6fcbb24b029b1f","output_sha256":"sha256:cd6c978affba369519dcbdd5b2c458c20932989950620eecc67de81e3a54fd80","receipt_uuid":"680987ec-2152-4f43-b944-feadec12434a","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

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.