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PFOI // PROTOCOL SPECIFICATION

METROLOGY & CONFORMITY

Specification :: Metrology / ISO-17020

Determinism in Layer 0: Aligning NDT Metrology and ISO/IEC 17020

Formalizing physical sensor calibration, measurement uncertainty bounds, and sworn inspection body standards for zero-trust RWA verification protocols.

<div class="meta-info">
  <span><strong>Doc ID:</strong> SPEC-PTVS-002</span>
  <span><strong>Author:</strong> Lead Architect (ORCID: 0009-0007-5824-3602)</span>
  <span><strong>Repository:</strong> Zenodo DOI 10.5281/zenodo.21719175</span>
</div>

<section>
  <h2>1. The Garbage-In, Garbage-Out Problem in Physical Oracles</h2>
  <p>
    In smart contract engineering, absolute determinism is assumed at execution time. However, when interfacing with physical collateral, the integrity of on-chain state mutations is entirely constrained by the precision and neutrality of Layer 0 sensory input.
  </p>
  <p>
    If an inspection body utilizes uncalibrated ultrasonic transducers, unverified thermal sensors, or uncertified visual testing procedures, the resulting physical payload is flawed. Ingesting arbitrary or unverified sensory data into a deterministic smart contract creates severe collateral vulnerabilities.
  </p>

  <h2>2. ISO/IEC 17020 Inspection Body Alignment</h2>
  <p>
    The <strong>Prop Trust Verified Standard (PTVS v1.0)</strong> dictates that physical inspection payloads are legally and deterministically valid only when issued by entities operating under <strong>ISO/IEC 17020 (Type A Independent Inspection Bodies)</strong> requirements.
  </p>

  <div class="tech-callout">
    <h3>Core Inspection Body Requirements</h3>
    <ul>
      <li><strong>Type A Independence:</strong> The inspecting perito/entity must be completely independent of the asset owner, token issuer, and liquidity pool operators.</li>
      <li><strong>Traceability of Measurement:</strong> All non-destructive testing (NDT) equipment must hold active calibration certificates traceable to national metrology institutes (NIMs).</li>
      <li><strong>Standardized Procedures:</strong> Inspections must follow published EN/ASTM/ISO NDT standards (e.g., ISO 16810 for Ultrasonic Testing).</li>
    </ul>
  </div>

  <h2>3. Metrological Uncertainty Payload Specification</h2>
  <p>
    To prevent binary misclassifications in smart contracts, PTVS v1.0 requires that raw NDT sensor outputs include expanded measurement uncertainty values ($U$) computed in accordance with the <i>Guide to the Expression of Uncertainty in Measurement (GUM)</i>.
  </p>
  <p>
    The physical observation vector $\vec{P}$ is anchored into the QFER payload using standard uncertainty parameters:
  </p>

{
  "metrologyData": {
    "instrumentID": "UT-OLYMPUS-38DL-0891",
    "calibrationCertificateRef": "CAL-2026-9921-ENAC",
    "calibrationValidUntil": "2027-04-15",
    "measurementType": "UltrasonicHullThickness",
    "observedValue": {
      "nominalValue": 12.4,
      "unit": "mm",
      "expandedUncertainty": 0.05,
      "coverageFactorK": 2,
      "confidenceInterval": "95%"
    },
    "thresholdTolerance": {
      "minimumRequiredThickness": 10.0,
      "unit": "mm"
    },
    "metrologicalPassStatus": true
  }
}

  <h2>4. Verification Pipeline: From Metrology to On-Chain Cryptographic Anchor</h2>
  <p>
    The data pipeline transforming physical sensor readings into an immutable on-chain record follows a strict four-step sequence:
  </p>
  <ol>
    <li><strong>Physical Acquisition:</strong> Sworn <i>Prop Trust Certified Experts (PTCE)</i> execute NDT readings using ISO/IEC 17020 compliant protocols.</li>
    <li><strong>Uncertainty Calculation:</strong> The physical readings are validated against sensor calibration curves to determine absolute tolerance boundaries.</li>
    <li><strong>eIDAS 2.0 QES Signing:</strong> The structured JSON-LD payload (containing metrological data + SHA-256 asset hash) is signed using the perito's Qualified Electronic Signature token.</li>
    <li><strong>Oracle Ingestion:</strong> The payload hash and signature vector are submitted to the <code>IPTVSPhysicalOracle</code> smart contract, enabling cryptographic proof of physical integrity.</li>
  </ol>

  <h2>5. Summary</h2>
  <p>
    By requiring strict adherence to ISO/IEC 17020 inspection body neutrality and embedding metrological uncertainty parameters into QFER data payloads, PTVS v1.0 establishes a bulletproof Layer 0 foundation for institutional digital asset markets.
  </p>
</section>

<div style="margin-top: 60px; padding: 25px; border: 1px solid var(--border); background: var(--card-bg); text-align: center;">
  <h3 style="font-family: 'Fira Code', monospace; color: var(--cyan); margin-bottom: 10px;">Access NDT & Metrology Verification Guidelines</h3>
  <p style="font-size: 9.5pt; color: var(--muted); margin-bottom: 20px;">Review ISO/IEC 17020 alignment rules and NDT measurement schemas in the official repository.</p>
  <a href="https://forensics-oracle.org/spec/v1.0" style="color: var(--cyan); text-decoration: none; border: 1px solid var(--cyan); padding: 8px 20px; font-family: 'Fira Code', monospace; font-size: 8.5pt; text-transform: uppercase;">View Technical Metrology Spec</a>
</div>

Forensics Oracle Initiative (PFOI) // PropTrust Association (Zug, Switzerland)

ISO/IEC 17020 Aligned · eIDAS 2.0 QES Anchored · Zenodo Registered

{
  "metrologyData": {
    "instrumentID": "UT-OLYMPUS-38DL-0891",
    "calibrationCertificateRef": "CAL-2026-9921-ENAC",
    "calibrationValidUntil": "2027-04-15",
    "measurementType": "UltrasonicHullThickness",
    "observedValue": {
      "nominalValue": 12.4,
      "unit": "mm",
      "expandedUncertainty": 0.05,
      "coverageFactorK": 2,
      "confidenceInterval": "95%"
    },
    "thresholdTolerance": {
      "minimumRequiredThickness": 10.0,
      "unit": "mm"
    },
    "metrologicalPassStatus": true
  }
}

{
  "metrologyData": {
    "instrumentID": "UT-OLYMPUS-38DL-0891",
    "calibrationCertificateRef": "CAL-2026-9921-ENAC",
    "calibrationValidUntil": "2027-04-15",
    "measurementType": "UltrasonicHullThickness",
    "observedValue": {
      "nominalValue": 12.4,
      "unit": "mm",
      "expandedUncertainty": 0.05,
      "coverageFactorK": 2,
      "confidenceInterval": "95%"
    },
    "thresholdTolerance": {
      "minimumRequiredThickness": 10.0,
      "unit": "mm"
    },
    "metrologicalPassStatus": true
  }
}