> ## Documentation Index
> Fetch the complete documentation index at: https://docs.elevatedsignals.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Data integrity (ALCOA+)

> How Invariant supports ALCOA+ data-integrity principles.

| ALCOA+ principle    | Invariant support                                                 |
| ------------------- | ----------------------------------------------------------------- |
| **Attributable**    | Every action records the actor (human/AI/system) and organization |
| **Legible**         | Structured records; human-readable audit trail                    |
| **Contemporaneous** | Audit entries written atomically with the business change         |
| **Original**        | Source records retained; exports are derived copies               |
| **Accurate**        | Server-side completeness gates + versioned metric contract        |
| **Complete**        | Reason-for-change on regulated edits; linked records              |
| **Consistent**      | Enforced lifecycle ordering + hash-chained sequence               |
| **Enduring**        | Append-only audit + signatures                                    |
| **Available**       | Verifiable on demand; exportable                                  |

Authoritative statement: Validation Accelerator Pack artifact A8.