Chain of custody is more than file integrity.

Content hashing can show whether a collected artifact has changed. It does not, by itself, establish that the artifact was current, complete, attributable, applicable, or independently reviewed. Procurement and assurance reviewers need both integrity properties and contextual facts.

Assessment boundary: A chain-of-custody statement does not certify that the originating control operated effectively. It records the provenance, handling, verification, and limitations of the evidence supplied for a defined point-in-time review.

1. Artifact identity

Each artifact should have a stable record that distinguishes it from similarly named documents and later versions.

  • artifact title and unique evidence identifier;
  • document or record type;
  • content hash and hashing method;
  • file size, format, and collection date;
  • system, model, dataset, or process version supported.

2. Source and ownership

A reviewer should be able to identify who supplied the artifact and who is accountable for the underlying process.

  • originating organization and business owner;
  • technical or operational custodian;
  • submission channel and submitting actor;
  • approval authority, where applicable;
  • known independence or conflict considerations.

3. Handling and verification history

The record should preserve material actions taken after collection rather than presenting the final package as if it appeared fully formed.

  • collection and ingestion timestamp;
  • text extraction or transformation performed;
  • candidate control relationships proposed;
  • human verification, rejection, or revision actions;
  • reviewer identity, role, and decision timestamp;
  • append-only ledger range covering those actions.

4. Applicability and mapping context

An artifact can be authentic and still be irrelevant to the review requirement. The statement should therefore identify the defined review context and the basis for any verified relationship.

  • framework, requirement, or customer control under review;
  • organization role and system scope;
  • human-verified mapping conclusion;
  • limitations, exclusions, and unresolved applicability questions;
  • related evidence needed to complete the reviewer’s understanding.

5. Freshness and change conditions

Point-in-time evidence should state when it may cease to support the review. Relevant triggers can include a model change, prompt change, retrieval-corpus update, vendor change, revised policy, new deployment context, or expired test period.

A strong statement identifies the assessment date, known validity period, and conditions that should prompt reassessment. It does not imply continuous operation when only point-in-time evidence was examined.

What a reviewer should be able to reconstruct

  1. What was supplied?
  2. Where did it come from?
  3. Which version and review context did it support?
  4. Who examined and approved the relationship?
  5. What actions occurred after collection?
  6. What remains weak, missing, stale, or unresolved?
CHAIN-OF-CUSTODY REVIEW

Turn scattered AI evidence into a reviewer-readable record.

The $3,500 fixed-scope ATO Readiness Baseline inventories supplied artifacts, records verified mappings and gaps, orders remediation, and produces a point-in-time Chain-of-Custody Statement.

Request Baseline Intake