{
  "capability_id": "chemistry.acid_base.ph",
  "calculation_version": "1.0.1",
  "protocol_version": "1.0.0-proposed",
  "protocol_document_status": "proposed",
  "verification_revision": "2026-09-25.o2-o3.2",
  "claim_scope": "O2: water ion product at 25 °C vs a separate-module identity (≤2 ULP). Not a buffer. ≤2 ULP vs O3 applies only to the published tabulated pH vectors. Not a buffer.",
  "oracle": {
    "class": "O3",
    "library": "mpmath 1.4.1",
    "mpmath_dps": 80,
    "backend": null,
    "rounding": null,
    "independent_of_iut": true,
    "generator_id": "ph-mpmath-o3",
    "generator_version": "1.0.0",
    "generator_sha256": "ea985a18662b296849b675ce0e94c1a07c914f2b45fe0ef7a7cbcc67b0de1fa0",
    "table_sha256": "a296775627da4ca5846cb815e4a56f444bc19ef27a9435cabd803875897d43dc"
  },
  "result_summary": {
    "passed": 8,
    "total": 8,
    "failed": 0,
    "max_error_ulp": 0,
    "threshold_ulp": 2,
    "max_threshold_ulp": 2
  },
  "public_files": {
    "manifest": "/evidence/chemistry.acid_base.ph/1.0.1.cvp.json",
    "this_file": "/evidence/chemistry.acid_base.ph/reproduce.json"
  },
  "vectors": [],
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary",
    "kind": "reproduce"
  }
}