NAS data layer
Auditable AI Decision Record
Each AI-assisted recommendation, approval and rejection on a flight is appended to a decision record whose rows are linked by an HMAC-SHA256 hash chain. Verification recomputes every chained row: an altered row, or a row inserted or removed mid-chain, fails the check. Removal of the newest rows needs an external anchor, which this demo does not include.
Data tier: flight object is a schema-faithful simulation of the published NAS flight-object field list — seeded fiction, not live SWIM data. The audit chain and its verification are fully real (HMAC-SHA256 over the live demo store).
Decision actions for these flights are taken on the Flight Decision Record and TMI Recovery surfaces — they land here.
NAS /flight-object …
Decision trail (append-only, HMAC-chained)
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