# HXP-005 — Intrinsic Evidence Capture and Correspondence

Status: Validation Protocol 0.1

## Profiles

The initial public extractor is `helix-public-tiles-v1`: a deterministic 8×8 RGB feature vector generated from a controlled image. It is intentionally simple and independently reproducible. It provides a signed enrollment template, not a production correspondence claim.

Capture profiles specify object class, lighting, framing, calibration, resolution, permitted processing, extractor identifier and digest, quality rules, and resource limits. Exact-byte evidence uses `exact-byte-inventory-v1` and cannot support fresh-capture correspondence.

## Matching

A fresh observation is processed by the same authorized extractor. Matching thresholds are versioned by object class and capture profile. Reports include score, threshold, quality, device, operator, session, and the result `match`, `no-match`, or `indeterminate`.

## Validation

Training, threshold selection, and final evaluation sets are separated by physical object, device, operator, and session. The dossier includes natural changes, conservation treatment, glare, focus, scale, crop, contamination, and deliberate lookalikes. No claim advances from the existence of an extractor alone.