Verifiable receipt e5eadb3d - bill_audit result | Zambo

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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 bill_audit call on Zambo: {"potential_errors":[{"item":"EC2 instance types","issue":"Overprovisioned instance sizes for dev workloads",

Observed result

potential errors 1 / item: EC2 instance types potential errors 1 / issue: Overprovisioned instance sizes for dev workloads potential errors 1 / estimated impact: $500 potential errors 2 / item: On-demand usage potential errors 2 / issue: No Reserved Instances or Savings Plans applied potential errors 2 / estimated impact: $400 potential errors 3 / item: Idle instances potential errors 3 / issue: Instances running 24/7 with low CPU utilization potential errors 3 / estimated impact: $300 negotiation script: Hello, I'm reviewing our AWS bill and noticed the $2,400 charge for dev EC2 instances. Could we discuss options to reduce costs, such as applying Savings Plans, converting to Reserved Instances, or rightsizing the instances? We're also seeing some idle resources that might be terminated. I'd appreciate any credits or discounts you can offer for a long‑term partnership. estimated savings: $1,200 (approximately 50% of the current bill) best approach: Combine rightsizing, Reserved Instances/Savings Plans, and request a goodwill credit for the past month. [REDACTED SECRET] 1: Long‑term AWS relationship [REDACTED SECRET] 2: Potential to increase usage if costs are optimized [REDACTED SECRET] 3: High spend category (over $2k) qualifies for Enterprise discount [REDACTED SECRET] 4: Willingness to commit to Reserved Instances escalation path: If the account manager cannot provide a discount, request escalation to the AWS Enterprise Support team or a senior pricing specialist. verdict: Bill appears high for dev workloads; likely overprovisioned and missing discounts. Negotiation is viable. disclaimer: AI analysis — verify all charges with your provider before disputing.

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: 2026-10-17T03:02:33.665Z; external immutability is not checked

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  • 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
e5eadb3d-2cad-418a-ac73-7bcd035c49a6
SHA-256 output hash
sha256:3ae208247877b809f4632ba86412a78e671ea939c47e073bdb30cf71dc4ffae6
Canonical bytes
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
Timestamp

Bound call context

Receipt schema
0.4
Tool name
bill_audit
Tool version
4.0.0
Permission scope
public
Caller type
anonymous
Caller ID
sha256:831c0b63a8e508a6e53738c083ac40181438af8f6d1b1be7ea56ff0cfa7668a9
Caller basis
ip_ua_30d
Caller rotates at
2026-11-03T00:00:00.000Z
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
faa3a2dc3496edf8705683a3fe5b4960bacd14eb326568f067970369e65ee364
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":"2026-10-17T03:02:33.665Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:3ae208247877b809f4632ba86412a78e671ea939c47e073bdb30cf71dc4ffae6","receipt_uuid":"e5eadb3d-2cad-418a-ac73-7bcd035c49a6","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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