OpenChainGraph Suite · ART-309 · insurance evidence
Parametric Index Deriver
Deterministically aggregates a named metric (mean, sum, count, max, or min) across a receipt set into a parametric index value: receipts as an oracle replacement, replay-on-challenge instead of trust-the-feed.
Oracle ReplacementFeeds art-251Zero PII
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Scope
Independent adjacency, no dedicated chain. Feeds the shipped compute_parametric_trigger_payout kernel (art-251), which performs the actual trigger-vs-payout math; this kernel never reimplements that logic. The index is a REPLAYABLE derived value, never a settlement trigger by itself.