Auditor evidence pack
Savings claim at compare contracted to paid
Procurement & Source-to-Pay · Savings Assurance · line PR11B · Leakage Detection. This pack names every action taken on this unit, who or what took it, the authority that permitted it, and the model, prompt and policy versions in force at that moment.
Every record links to the one before it and hashes to its stored value. 1 record were re-hashed on this page load, in order, starting from the genesis value. Nothing was read from a cached verdict.
hash = sha256(prevHash + "|" + JSON{seq, unitRef, actor, action, outcome, occurredAt})
The unit
What the work was, and where it sits
Every action, in order
Actor, authority, versions in force, and the hash link to the record before it
Holding at compare contracted to paid
Authority relied on
Who was allowed to do this, up to what value, in which jurisdictions
Any unit on a savings assurance line where every intake check passed, the policy in force is current, and the value sits inside the cap below.
Versions in force
Exactly what was running when these actions were taken
| Kind | Identifier | Version | Status | Owner |
|---|---|---|---|---|
| model | extract-lite | 2.9 | current | Platform model council |
| policy | supplier-onboarding | v6 | current | Chief procurement officer |
| prompt | task-execution | p21 | current | Shared service engineering |
| toolset | ledger-write | t7 | current | Finance systems |
| toolset | document-fetch | t9 | current | Shared service engineering |
Gates on this line
The control points this unit had to clear
Records schedule and holds
How long this evidence must be kept, and whether it is frozen
What this pack proves, and what it does not
Read this before you rely on it
- Every action carries a named actor, an actor kind, and a timestamp.
- Every action names the authority grant that permitted it and the cap that grant carries.
- Every action stamps the model, prompt, policy and tool versions in force at that moment.
- Corrections are additive. A later record supersedes an earlier one and says why; the earlier record is never edited or deleted.
- The chain is re-hashed live on this page, so a single altered field is detected immediately.
- It is not tamper-proof against an attacker with write access to the store, who could rewrite the whole chain from genesis. Making that impossible requires publishing chain tips to a store this application cannot write to. That anchor is not built, and this page does not claim it.
- The evidence in this demonstration is modeled from a simulated estate, not captured from production systems.
- Identity here is the actor name recorded on the action. Cryptographic agent identity and signed attestation are a separate piece of work.