Bill audit · saved and checkable

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What was asked: The request recorded for this receipt.

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Observed result

potential errors 1 / item: EC2 dev instances running 24/7 potential errors 1 / issue: Instances not right‑sized and running continuously potential errors 1 / estimated impact: $500/month potential errors 2 / item: No Reserved Instances or Savings Plans applied potential errors 2 / issue: Higher on‑demand rates than necessary potential errors 2 / estimated impact: $400/month potential errors 3 / item: Spot instances not utilized where eligible potential errors 3 / issue: Missing cheaper Spot pricing for flexible workloads potential errors 3 / estimated impact: $200/month negotiation script: Hello, I'm reviewing my AWS bill of $2,400 for dev EC2 instances. I noticed the cost seems high for development workloads. Could we explore options to reduce this, such as Reserved Instances, Savings Plans, right‑sizing, or Spot instances? I'd also like a detailed usage breakdown to ensure I'm not being overcharged. estimated savings: $1,100 per month (about 45% of the total) best approach: Ask for a usage audit, propose Reserved Instances for steady workloads, Savings Plans for flexibility, right‑size instance types, and shift eligible workloads to Spot instances. [REDACTED SECRET] 1: High monthly spend [REDACTED SECRET] 2: Long‑term potential as a customer [REDACTED SECRET] 3: Competitive cloud pricing [REDACTED SECRET] 4: Development environment can be optimized [REDACTED SECRET] 5: AWS offers cost‑optimization programs escalation path: Speak with your AWS account manager first; if no resolution, request a senior account executive; if still unresolved, open a case with AWS Support leadership. verdict: The bill appears inflated; there are clear optimization and negotiation opportunities that could save roughly $1,100 monthly. 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: 2026-10-26T03:02:34.472Z; external immutability is not checked

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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
e2c36a8d-32d0-4677-a60b-87e40bcd7cb6
SHA-256 output hash
sha256:6220b34bd23c82763b2e34a460e2176205f4208006c52e61301e424dfba98d15
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
5224b5d65357e3ba50bcbef164ef6993320e273f5774869bb21db763f6339ea7
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":"2026-10-26T03:02:34.472Z","evidence_byte_length":null,"evidence_sha256":null,"evidence_url":null,"output_sha256":"sha256:6220b34bd23c82763b2e34a460e2176205f4208006c52e61301e424dfba98d15","receipt_uuid":"e2c36a8d-32d0-4677-a60b-87e40bcd7cb6","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.

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Markdown

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HTML

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