{
  "protocol": {
    "name": "CVP",
    "version": "1.0.0-proposed",
    "revision": "2026-09-13",
    "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148",
    "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0"
  },
  "document_status": "proposed",
  "calculator": {
    "id": "tur",
    "version": "1.0.1",
    "title": "Test Uncertainty Ratio Calculator",
    "formula_family": "tur",
    "capability_id": "engineering.uncertainty.tur",
    "verification_revision": "2026-09-23.o2-o3"
  },
  "profile": "engineering",
  "verified_scope": "ANSI/NCSL Z540.3 two-sided TUR = (USL−LSL)/(2U) for an already-expanded U, plus span T and half-width tol, + O3 mpmath tabulated TUR.",
  "deferred_scope": "Not a TUR≥4 pass/fail, not a guard band, and not U = k·u_c.",
  "status": "VERIFIED",
  "verification_status": "VERIFIED",
  "production_freshness": "CURRENT",
  "overall_trust": "VERIFIED",
  "runner": {
    "name": "cvp-runner",
    "version": "1.0.0"
  },
  "environment": {
    "runtime": "node",
    "runtime_version": "20.19.2",
    "numeric_model": "IEEE-754 binary64",
    "os": "darwin"
  },
  "suite": {
    "id": "tur",
    "version": "1.0.1",
    "uri": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1.json",
    "verification_revision": "2026-09-23.o2-o3"
  },
  "obligation_set": [
    "CVP-PROV-01",
    "CVP-MODEL-01",
    "CVP-SCOPE-01",
    "CVP-UNIT-01",
    "CVP-REF-01",
    "CVP-GOLD-01",
    "CVP-BND-01",
    "CVP-INV-01",
    "CVP-NUM-01",
    "CVP-COV-01",
    "CVP-CONTRACT-01",
    "CVP-DEP-01",
    "CVP-ART-01",
    "CVP-PROD-01",
    "CVP-DIM-01",
    "CVP-PROP-01",
    "CVP-META-01",
    "CVP-IFACE-01"
  ],
  "provenance": {
    "mode": "direct",
    "sources": [
      {
        "label": "ANSI/NCSL Z540.3 — Requirements for the Calibration of Measuring and Test Equipment",
        "kind": "standard",
        "reference": "Test uncertainty ratio (two-sided TUR = specification span / 2U)"
      },
      {
        "label": "ILAC G8:09/2019 — Guidelines on Decision Rules and Statements of Conformity",
        "kind": "standard",
        "reference": "Decision rules are a different contract from TUR",
        "url": "https://ilac.org/publications-and-resources/ilac-guidance-series/"
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "ANSI/NCSL Z540.3 two-sided test uncertainty ratio"
      },
      {
        "class": "O3",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Precomputed mpmath high-precision Z540.3 TUR (80 dps) rounded to nearest binary64 — not V8 Math",
        "engine": {
          "name": "tur-mpmath-o3",
          "precision_bits": 265,
          "independent_of_iut": true,
          "same_runtime_as_iut": false,
          "library": "mpmath 1.4.1",
          "mpmath_dps": 80,
          "generator_version": "1.0.0",
          "generator_sha256": "e10c4f6b4127424bad87212df5b9087cba62d8f5d3d0c5623579f262a5f211f0",
          "table_sha256": "71c97eec7d89476da75fd8e257bda368519bbc2fe7605e74622e18ce663ec48c",
          "seed": "20260923.tur-o3",
          "source": "https://www.calculatorx.com/developers/cvp/reproduce/tur-o3-tables.json",
          "public_table": "/developers/cvp/reproduce/tur-o3-tables.json",
          "public_generator": "/developers/cvp/reproduce/generate-tur-o3.py"
        }
      },
      {
        "class": "O3",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same O3 table vs IUT TUR; ≤2 ULP on tabulated vectors only",
        "engine": {
          "name": "tur-mpmath-o3",
          "precision_bits": 265,
          "independent_of_iut": true,
          "same_runtime_as_iut": false,
          "library": "mpmath 1.4.1",
          "mpmath_dps": 80,
          "generator_version": "1.0.0",
          "generator_sha256": "e10c4f6b4127424bad87212df5b9087cba62d8f5d3d0c5623579f262a5f211f0",
          "table_sha256": "71c97eec7d89476da75fd8e257bda368519bbc2fe7605e74622e18ce663ec48c",
          "seed": "20260923.tur-o3",
          "source": "https://www.calculatorx.com/developers/cvp/reproduce/tur-o3-tables.json",
          "public_table": "/developers/cvp/reproduce/tur-o3-tables.json",
          "public_generator": "/developers/cvp/reproduce/generate-tur-o3.py"
        }
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Separate-module ANSI/NCSL Z540.3 TUR oracle — same V8 binary64 as IUT",
        "engine": {
          "name": "tur-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same O2 module backs ≤2 ULP TUR comparison vs IUT",
        "engine": {
          "name": "tur-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      }
    ],
    "notes": "Golden expected values use a separate O2 module (not IUT transcription). O2 shares Node/V8 binary64 with the IUT unless noted otherwise."
  },
  "controls": {
    "CVP-PROV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Sources present on evidence"
    },
    "CVP-MODEL-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "ANSI/NCSL Z540.3 TUR = span/(2U); O3 tabulated TUR"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Two-sided TUR from an already-expanded U. Not a verdict, not a guard band, not U=k·u_c. O3 tabulated vectors only."
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "U and the specification share an implied unit. TUR is dimensionless."
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 model + O2 expected_values + O2 numerical_behavior + O3 tabulated Z540.3"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "1/1 legacy golden; 4/4 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "7/7 CVP boundary · 7/7 legacy Evidence boundary"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "4 Evidence illegal-input + 4/4 oracle-backed error-code (exact_error_match, not ULP)"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=1; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "5/5 partitions (limits, span, half-width, alias, invalid-domain)"
    },
    "CVP-CONTRACT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "6/6 CVP contract · release-artifacts-aligned=PASS · schema-output-required-declared=PASS · schema-valid-input-executes=PASS · engine-success-output-validates-schema=PASS · schema-rejects-incomplete-input=PASS · rest-success-payload-validates-schema=PASS"
    },
    "CVP-DEP-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "engine tur; Node binary64"
    },
    "CVP-ART-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry"
    },
    "CVP-PROD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "this calculator CURRENT · bound snapshot pass @ 2026-09-24T03:01:27.868Z · live site-wide report stale @ 2026-09-24T03:01:44.421Z (103 other capabilities) · local checks pass · attestation_id=485d058427c8def04f9ec6c35dc0a2e115086cad7adaeb23f0886c27161d51fc · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-09-24T03:01:27.868Z · Live production status STALE (103 capabilities; 191 remain CURRENT) @ 2026-09-24T03:01:44.421Z · Public schema 1.0.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.0.1 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · cvp-immutable-manifest-fetch=pass · cvp-immutable-manifest-sha256=pass · cvp-latest-alias-matches-immutable=pass · cvp-reproduce-manifest-agree=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=e8d1161be1a15b9144a5af47ec3f09c44217605afff82cbb8d4b5d1ff406d635 · verified_at=2026-09-23T10:40:38.029Z · evidence_attested_at=2026-09-23T10:40:38.029Z · last_confirmed_current_at=2026-09-24T03:01:27.868Z · rendered_at=2026-09-24T03:01:44.478Z · binds=cvp_core_sha256",
      "check_result": "PASS",
      "production_state": "CURRENT",
      "binding_current": true
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "Two-sided test uncertainty ratio"
    },
    "CVP-PROP-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "1/1 property · enumerated fixed assertions (not generated; no seed)"
    },
    "CVP-META-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "1/1 metamorphic"
    },
    "CVP-ROUND-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No inverse / round-trip vectors in pack — control not in obligation set"
    },
    "CVP-XCAL-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set"
    },
    "CVP-IFACE-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only."
    },
    "CVP-ORACLE-01": {
      "result": "PASS",
      "applicability": "higher_assurance",
      "notes": "O3 8/8 tabulated vectors vs IUT · O2: ANSI/NCSL Z540.3 two-sided TUR = span/(2U) vs a separate-module identity (≤2 ULP). Not a TUR≥4 verdict, not a guard band, and not U = k·u_c. ≤2 ULP vs O3 applies only to the published tabulated Z540.3 vectors (limits, span, half-width, aliases, and one awkward span). It is not a whole-domain guarantee and does not cover a TUR≥4 verdict, a guard band, or U = k·u_c."
    },
    "CVP-EXP-01": {
      "result": "SKIP",
      "applicability": "optional",
      "notes": "named expert review not performed"
    }
  },
  "tests": {
    "golden": {
      "passed": 4,
      "total": 4,
      "failed": 0,
      "case_ids": [
        "g-limits",
        "g-span",
        "g-tol",
        "g-alias"
      ]
    },
    "boundary": {
      "passed": 7,
      "total": 7,
      "failed": 0,
      "case_ids": [
        "boundary-tur",
        "boundary-tur-T",
        "boundary-tur-tol",
        "boundary-tur-missing-U",
        "boundary-tur-missing-spec",
        "boundary-tur-U",
        "boundary-tur-both"
      ]
    },
    "invalid": {
      "passed": 8,
      "total": 8,
      "failed": 0,
      "case_ids": [
        "boundary-tur-missing-U",
        "boundary-tur-missing-spec",
        "boundary-tur-U",
        "boundary-tur-both",
        "inv-missing-u",
        "inv-missing-spec",
        "inv-zero-u",
        "inv-both"
      ],
      "comparison": "exact_error_match",
      "records": [
        {
          "id": "inv-missing-u",
          "comparison": "exact_error_match",
          "expected": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "actual": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "match": true
        },
        {
          "id": "inv-missing-spec",
          "comparison": "exact_error_match",
          "expected": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "actual": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "match": true
        },
        {
          "id": "inv-zero-u",
          "comparison": "exact_error_match",
          "expected": {
            "code": "VALUE_MUST_BE_POSITIVE"
          },
          "actual": {
            "code": "VALUE_MUST_BE_POSITIVE"
          },
          "match": true
        },
        {
          "id": "inv-both",
          "comparison": "exact_error_match",
          "expected": {
            "code": "INVALID_INPUT"
          },
          "actual": {
            "code": "INVALID_INPUT"
          },
          "match": true
        }
      ]
    },
    "property": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "prop-double-u"
      ],
      "kind": "fixed",
      "claim_scope": "Enumerated identity: doubling U halves TUR. Not generated property tests, and not a TUR≥4 verdict.",
      "definition_ids": [
        "doubling-u-halves-tur"
      ]
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "metamorphic": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "meta-double-u"
      ],
      "definition_ids": [
        "doubling-u-halves-tur"
      ]
    },
    "contract": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "cross_interface": {
      "passed": 4,
      "total": 4,
      "failed": 0,
      "case_ids": [
        "iface-limits",
        "iface-span",
        "iface-tol",
        "iface-missing-spec"
      ]
    },
    "o3": {
      "passed": 8,
      "total": 8,
      "failed": 0,
      "case_ids": [
        "o3-limits",
        "o3-span",
        "o3-tol",
        "o3-alias",
        "o3-span-alias",
        "o3-half",
        "o3-wide",
        "o3-awkward"
      ],
      "generator_id": "tur-mpmath-o3",
      "seed": "20260923.tur-o3",
      "table_sha256": "71c97eec7d89476da75fd8e257bda368519bbc2fe7605e74622e18ce663ec48c",
      "max_error_ulp": 1,
      "reproduce": "python3 generate-tur-o3.py",
      "table_url": "/developers/cvp/reproduce/tur-o3-tables.json",
      "generator_url": "/developers/cvp/reproduce/generate-tur-o3.py",
      "claim_scope": "O2: ANSI/NCSL Z540.3 two-sided TUR = span/(2U) vs a separate-module identity (≤2 ULP). Not a TUR≥4 verdict, not a guard band, and not U = k·u_c. ≤2 ULP vs O3 applies only to the published tabulated Z540.3 vectors (limits, span, half-width, aliases, and one awkward span). It is not a whole-domain guarantee and does not cover a TUR≥4 verdict, a guard band, or U = k·u_c.",
      "reproduce_url": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/reproduce"
    }
  },
  "coverage": {
    "partitions": [
      {
        "id": "limits",
        "description": "lsl and usl, not an alias",
        "exercised": true,
        "case_count": 8
      },
      {
        "id": "span",
        "description": "Full span T",
        "exercised": true,
        "case_count": 3
      },
      {
        "id": "half-width",
        "description": "Half-width tol, span = 2·tol",
        "exercised": true,
        "case_count": 4
      },
      {
        "id": "alias",
        "description": "U_exp / LSL / USL / span aliases",
        "exercised": true,
        "case_count": 3
      },
      {
        "id": "invalid-domain",
        "description": "Missing U or spec, U ≤ 0, or more than one spec form",
        "exercised": true,
        "case_count": 8
      }
    ]
  },
  "numerical": {
    "representation": "IEEE-754 binary64",
    "claim_scope": "O2: ANSI/NCSL Z540.3 two-sided TUR = span/(2U) vs a separate-module identity (≤2 ULP). Not a TUR≥4 verdict, not a guard band, and not U = k·u_c. ≤2 ULP vs O3 applies only to the published tabulated Z540.3 vectors (limits, span, half-width, aliases, and one awkward span). It is not a whole-domain guarantee and does not cover a TUR≥4 verdict, a guard band, or U = k·u_c.",
    "tolerance": {
      "type": "ulp",
      "value": 2,
      "rationale": "Independent Z540.3 identity vs IUT on same V8 binary64. ≤2 ULP declared a priori.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 1,
    "records": [
      {
        "id": "g-limits",
        "reference": {
          "TUR": 2.5,
          "T": 5,
          "U": 1,
          "lsl": 0,
          "usl": 5
        },
        "actual": {
          "TUR": 2.5,
          "T": 5,
          "U": 1,
          "lsl": 0,
          "usl": 5
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "golden"
      },
      {
        "id": "g-span",
        "reference": {
          "TUR": 4,
          "T": 4,
          "U": 0.5
        },
        "actual": {
          "TUR": 4,
          "T": 4,
          "U": 0.5
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "golden"
      },
      {
        "id": "g-tol",
        "reference": {
          "TUR": 4,
          "T": 4,
          "U": 0.5,
          "tol": 2
        },
        "actual": {
          "TUR": 4,
          "T": 4,
          "U": 0.5,
          "tol": 2
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "golden"
      },
      {
        "id": "g-alias",
        "reference": {
          "TUR": 2,
          "T": 4,
          "U": 1,
          "lsl": -1,
          "usl": 3
        },
        "actual": {
          "TUR": 2,
          "T": 4,
          "U": 1,
          "lsl": -1,
          "usl": 3
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "golden"
      },
      {
        "id": "meta-double-u",
        "reference": 2,
        "actual": 2,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "metamorphic",
        "hops": {
          "base": {
            "reference": {
              "TUR": 2.5,
              "T": 5,
              "U": 1,
              "lsl": 0,
              "usl": 5
            },
            "actual": {
              "TUR": 2.5,
              "T": 5,
              "U": 1,
              "lsl": 0,
              "usl": 5
            },
            "error_ulp": 0
          },
          "follow": {
            "reference": {
              "TUR": 1.25,
              "T": 5,
              "U": 2,
              "lsl": 0,
              "usl": 5
            },
            "actual": {
              "TUR": 1.25,
              "T": 5,
              "U": 2,
              "lsl": 0,
              "usl": 5
            },
            "error_ulp": 0
          },
          "relation": {
            "reference": 2,
            "actual": 2,
            "error_ulp": 0
          }
        }
      },
      {
        "id": "o3-limits",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 2.5,
          "T": 5,
          "U": 1
        },
        "actual": {
          "TUR": 2.5,
          "T": 5,
          "U": 1,
          "lsl": 0,
          "usl": 5
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-span",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 4,
          "T": 4,
          "U": 0.5
        },
        "actual": {
          "TUR": 4,
          "T": 4,
          "U": 0.5
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-tol",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 4,
          "T": 4,
          "U": 0.5
        },
        "actual": {
          "TUR": 4,
          "T": 4,
          "U": 0.5,
          "tol": 2
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-alias",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 2,
          "T": 4,
          "U": 1
        },
        "actual": {
          "TUR": 2,
          "T": 4,
          "U": 1,
          "lsl": -1,
          "usl": 3
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-span-alias",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 2,
          "T": 8,
          "U": 2
        },
        "actual": {
          "TUR": 2,
          "T": 8,
          "U": 2
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-half",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 4,
          "T": 2,
          "U": 0.25
        },
        "actual": {
          "TUR": 4,
          "T": 2,
          "U": 0.25,
          "tol": 1
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-wide",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 10,
          "T": 20,
          "U": 1
        },
        "actual": {
          "TUR": 10,
          "T": 20,
          "U": 1,
          "lsl": -10,
          "usl": 10
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 0
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      },
      {
        "id": "o3-awkward",
        "reference": {
          "oracle_layer": "analytic",
          "TUR": 7.666666666666667,
          "T": 2.3,
          "U": 0.15
        },
        "actual": {
          "TUR": 7.666666666666666,
          "T": 2.3,
          "U": 0.15,
          "lsl": 1.1,
          "usl": 3.4
        },
        "error_ulp": 1,
        "threshold_ulp": 2,
        "fields": {
          "TUR": {
            "ok": true,
            "error_ulp": 1
          },
          "T": {
            "ok": true,
            "error_ulp": 0
          },
          "U": {
            "ok": true,
            "error_ulp": 0
          }
        },
        "suite": "o3"
      }
    ]
  },
  "interfaces": {
    "compared": [
      "ui-ssr",
      "rest",
      "mcp"
    ],
    "result": "PASS",
    "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only."
  },
  "artifacts": {
    "evidence_bundle_sha256": "41c6058ecaee189b707eb3e0be77617e684ef7a7d499a5b74c839c43da55a2f0",
    "evidence_digest": "883bc95d518c3642f63fd3428c74c373b1dc74e15ff1e557dea5b21ca9dca1fa",
    "production_sha256": "e8d1161be1a15b9144a5af47ec3f09c44217605afff82cbb8d4b5d1ff406d635",
    "attested_catalog_sha256": "52419a75f87381c846435bf92ff0e55cf76f17e9ed5af27a656ef9c8dade1355",
    "production_checks": [
      {
        "id": "engineering.uncertainty.tur:output-const",
        "status": "pass",
        "detail": "output const 1.0.1 vs capability 1.0.1",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:evidence-sha256",
        "status": "pass",
        "detail": "e45340eae239",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:semantic-contract",
        "status": "pass",
        "detail": "12/12",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:capability-html-public-origin-agree",
        "status": "pass",
        "detail": "public 1.0.1 vs origin 1.0.1",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:cvp-manifest-public-origin-agree",
        "status": "pass",
        "detail": "engineering.uncertainty.tur/1.0.1/2026-09-23.o2-o3/engineering/883bc95d518c",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z",
        "projection_compared": false
      },
      {
        "id": "engineering.uncertainty.tur:cvp-latest-alias-agrees",
        "status": "pass",
        "detail": "engineering.uncertainty.tur/1.0.1/2026-09-23.o2-o3/engineering/883bc95d518c",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z",
        "projection_compared": false
      },
      {
        "id": "engineering.uncertainty.tur:cvp-immutable-manifest-fetch",
        "status": "pass",
        "detail": "public=200 origin=200",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:cvp-immutable-manifest-sha256",
        "status": "pass",
        "detail": "883bc95d518c",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:cvp-latest-alias-matches-immutable",
        "status": "pass",
        "detail": "engineering.uncertainty.tur/1.0.1/2026-09-23.o2-o3/engineering/883bc95d518c",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z",
        "projection_compared": false
      },
      {
        "id": "engineering.uncertainty.tur:cvp-reproduce-manifest-agree",
        "status": "pass",
        "detail": "2026-09-23.o2-o3 · 71c97eec7d89",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:calculator-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      },
      {
        "id": "engineering.uncertainty.tur:evidence-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-23T10:40:38.029Z"
      }
    ],
    "digest_registry": {
      "digest_algorithm": "sha256",
      "canonicalization": "json-sorted-keys-utf8",
      "entries": [
        {
          "name": "cvp_core_sha256",
          "field": "artifacts.cvp_core_sha256",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "883bc95d518c3642f63fd3428c74c373b1dc74e15ff1e557dea5b21ca9dca1fa",
          "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts"
        },
        {
          "name": "cvp_evidence_digest",
          "field": "artifacts.evidence_digest",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "883bc95d518c3642f63fd3428c74c373b1dc74e15ff1e557dea5b21ca9dca1fa",
          "note": "Alias of cvp_core_sha256 (historical field name)"
        },
        {
          "name": "artifact_evidence_sha256",
          "field": "release_integrity.digests.evidence_core_sha256",
          "digest_scope": "evidence_artifact_core",
          "value": "e45340eae239534fd2fc5fa1a19ab98c1947e7298019b14dc83ddf0f78d09f96",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "52419a75f87381c846435bf92ff0e55cf76f17e9ed5af27a656ef9c8dade1355",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "883bc95d518c3642f63fd3428c74c373b1dc74e15ff1e557dea5b21ca9dca1fa"
  },
  "dependencies": [
    {
      "name": "tur-engine",
      "version": "1.0.1"
    },
    {
      "name": "tur-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "tur-mpmath-o3-table",
      "version": "tur-mpmath-o3"
    },
    {
      "name": "node",
      "version": "20.19.2"
    }
  ],
  "attestation": {
    "status": "CURRENT",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "485d058427c8def04f9ec6c35dc0a2e115086cad7adaeb23f0886c27161d51fc",
    "attested_at": "2026-09-23T10:40:38.029Z",
    "last_confirmed_current_at": "2026-09-24T03:01:27.868Z",
    "site_attestation_current": false,
    "capability_attestation_current": true,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-09-24T03:01:27.868Z",
    "live_updated_at": "2026-09-24T03:01:44.421Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-09-24T03:01:27.868Z",
      "site_stale_count": 103
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 103,
    "site_stale_capability_count": 103,
    "evidence_attested_at": "2026-09-23T10:40:38.029Z"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.0.1",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-09-23T10:40:38.029Z",
    "generated_at": "2026-09-23T10:40:38.029Z",
    "rendered_at": "2026-09-24T03:01:44.478Z",
    "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report."
  },
  "links": {
    "legacy_evidence": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1.json",
    "evidence_page": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1",
    "calculator": "https://www.calculatorx.com/calc/engineering/test-uncertainty-ratio",
    "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json",
    "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0",
    "manifest": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1.cvp.json",
    "manifest_immutable": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1/2026-09-23.o2-o3.cvp.json",
    "reproduce": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/reproduce",
    "o3_table": "https://www.calculatorx.com/developers/cvp/reproduce/tur-o3-tables.json",
    "o3_generator": "https://www.calculatorx.com/developers/cvp/reproduce/generate-tur-o3.py",
    "manifest_core": "https://www.calculatorx.com/evidence/engineering.uncertainty.tur/1.0.1/2026-09-23.o2-o3.883bc95d518c.cvp.json"
  }
}