{
  "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": "gpa-to-letter",
    "version": "1.1.3",
    "title": "GPA ↔ Letter Grade Calculator",
    "formula_family": "gpa_letter_lookup",
    "capability_id": "education.gpa_letter",
    "verification_revision": "2026-09-29.release-truth-v1"
  },
  "profile": "core",
  "status": "VERIFIED",
  "verification_status": "VERIFIED",
  "production_freshness": "CURRENT",
  "overall_trust": "VERIFIED",
  "runner": {
    "name": "cvp-runner",
    "version": "1.0.0"
  },
  "environment": {
    "runtime": "node",
    "runtime_version": "22.20.0",
    "numeric_model": "IEEE-754 binary64",
    "os": "darwin"
  },
  "suite": {
    "id": "gpa-to-letter",
    "version": "1.1.3",
    "uri": "https://www.calculatorx.com/evidence/education.gpa_letter/1.1.3.json",
    "verification_revision": "2026-09-29.release-truth-v1"
  },
  "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": "University of Alabama — Grades and Grade Points",
        "kind": "other",
        "reference": "A+ = 4.33; A = 4.00; A− = 3.67; B+ = 3.33; … F = 0.00",
        "url": "https://catalog.ua.edu/undergraduate/about/academic-regulations/records/grades-grade-points-gpa/"
      },
      {
        "label": "Arizona State University Registrar — Grades and grading policies",
        "kind": "other",
        "reference": "A+ = 4.33 on the grading scale, but cumulative GPA is capped at 4.00",
        "url": "https://registrar.asu.edu/grades"
      },
      {
        "label": "Simon Fraser University SIAT — Recommended grading scale",
        "kind": "other",
        "reference": "A− = 85–89.5% with A− = 3.67 grade points (not 90–92%)",
        "url": "https://www.sfu.ca/siat/programs/undergraduate/current-students/student-resources/grading-scale.html"
      },
      {
        "label": "University of California Admissions — GPA requirement",
        "kind": "other",
        "reference": "A/B/C/D map to 4/3/2/1, then extra honors/AP/IB points are added with a honors-point cap",
        "url": "https://admission.universityofcalifornia.edu/admission-requirements/first-year-requirements/gpa-requirement.html"
      },
      {
        "label": "Randolph College Physics — Grade Scale",
        "kind": "other",
        "reference": "A+ = 97–100; A = 93–96; A− = 90–92; B+ = 87–89; … D− = 60–62; F = 0–59",
        "url": "https://physics.randolphcollege.edu/psheldon/classes/gradescale.html"
      },
      {
        "label": "St. Olaf College — Typical Grading Scale (Jill Dietz)",
        "kind": "other",
        "reference": "97–100% A/A+; 93–96% A; 90–92% A−; 87–89% B+; … 60–62% D−; <60% F",
        "url": "https://pages.stolaf.edu/dietz/typical-grading-scale/"
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "Published grade-point table with explicit matching policy"
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Separate-module GPA/letter oracle — independent published-table lookup",
        "engine": {
          "name": "gpa-letter-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same O2 module checks normalization, midpoint, floor, and quality-point behavior",
        "engine": {
          "name": "gpa-letter-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": "Published-table lookup; nearest midpoint ties select the higher grade point; optional floor policy"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Approximate interpretation on plus/minus 4.33, flat 4.0, and linear 5.0 normalization"
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "dimensionless grade points"
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 model + O2 expected_values + O2 numerical_behavior"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "16/16 legacy golden; 7/7 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "0/0 numeric-edge Evidence + 3/3 near-singularity numeric; illegal enum/system is Invalid only"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "0 Evidence illegal-input + 1/1 oracle-backed error-code (exact_error_match, not ULP)"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=0; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "6/6 declared partitions (plus-minus-nearest, floor, flat, linear5, to-gpa, invalid-domain) · 16 legacy golden / 3 CVP boundary unique cases · 0 Evidence invalid-input (may overlap boundary)"
    },
    "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 gpa-letter; 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 @ 2026-09-29T02:57:46.783Z · live site-wide report stale @ 2026-09-29T02:58:21.722Z (3 other capabilities) · local checks pass · attestation_id=32b8c8fc001c8156e721d1985f9285c24b4eb39419f1b706b7f4999d46ee806a · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-09-29T02:57:46.783Z · Live production status STALE (3 capabilities; 372 remain CURRENT) @ 2026-09-29T02:58:21.722Z · Public schema 1.1.3 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.1.3 · 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 · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=1d85769a84c3c2dae1be22be2327b7597b376eab7bd4215d31b26b062abb3454 · verified_at=2026-09-29T02:27:43.899Z · evidence_attested_at=2026-09-29T02:27:43.899Z · last_confirmed_current_at=2026-09-29T02:57:46.783Z · rendered_at=2026-09-29T02:58:21.921Z · binds=cvp_core_sha256",
      "check_result": "PASS",
      "production_state": "CURRENT",
      "binding_current": true
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "lookup / normalized grade-point scale"
    },
    "CVP-PROP-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "2/2 property"
    },
    "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."
    },
    "CVP-ORACLE-01": {
      "result": "SKIP",
      "applicability": "higher_assurance",
      "notes": "O2 present; O3 not required this wave"
    },
    "CVP-EXP-01": {
      "result": "SKIP",
      "applicability": "optional",
      "notes": "named expert review not performed"
    }
  },
  "tests": {
    "golden": {
      "passed": 7,
      "total": 7,
      "failed": 0,
      "case_ids": [
        "g-nearest-exact",
        "g-nearest-midpoint-up",
        "g-floor",
        "g-flat",
        "g-linear5",
        "g-to-gpa",
        "g-quality-points"
      ]
    },
    "boundary": {
      "passed": 3,
      "total": 3,
      "failed": 0,
      "case_ids": [
        "b-zero",
        "b-plus-minus-max",
        "b-linear5-max"
      ]
    },
    "invalid": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "inv-mode"
      ],
      "comparison": "exact_error_match",
      "records": [
        {
          "id": "inv-mode",
          "comparison": "exact_error_match",
          "expected": {
            "code": "INVALID_MODE"
          },
          "actual": {
            "code": "INVALID_MODE"
          },
          "match": true
        }
      ]
    },
    "property": {
      "passed": 2,
      "total": 2,
      "failed": 0,
      "case_ids": [
        "prop-table-point",
        "prop-quality-points"
      ],
      "definition_ids": [
        "published-table-fixed-point",
        "credits-times-points"
      ]
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "metamorphic": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "meta-linear5-normalization"
      ],
      "definition_ids": [
        "linear-five-to-four"
      ]
    },
    "contract": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "cross_interface": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "iface-to-letter"
      ]
    }
  },
  "coverage": {
    "partitions": [
      {
        "id": "plus-minus-nearest",
        "description": "Plus/minus 4.33 nearest lookup",
        "exercised": true,
        "case_count": 15
      },
      {
        "id": "floor",
        "description": "Floor lookup policy",
        "exercised": true,
        "case_count": 2
      },
      {
        "id": "flat",
        "description": "Flat 4.0 lookup",
        "exercised": true,
        "case_count": 4
      },
      {
        "id": "linear5",
        "description": "Linear 5.0 normalization",
        "exercised": true,
        "case_count": 4
      },
      {
        "id": "to-gpa",
        "description": "Letter to published grade points",
        "exercised": true,
        "case_count": 4
      },
      {
        "id": "invalid-domain",
        "description": "Invalid inputs",
        "exercised": true,
        "case_count": 1
      }
    ]
  },
  "numerical": {
    "representation": "IEEE-754 binary64 lookup and linear normalization",
    "tolerance": {
      "type": "composite",
      "value": 8,
      "absolute": 1e-12,
      "relative": 1e-12,
      "rationale": "Independent published lookup tables and midpoint policy; tolerance declared before evaluation.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 0,
    "records": [
      {
        "id": "g-nearest-exact",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "plus-minus",
          "match": "nearest",
          "inputGpa": 3.67,
          "gpa": 3.67,
          "normalized": false,
          "letter": "A-",
          "matchedGpa": 3.67,
          "tie": false,
          "value": "A-"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": "nearest",
          "inputGpa": 3.67,
          "gpa": 3.67,
          "normalized": false,
          "letter": "A-",
          "matchedGpa": 3.67,
          "pct": "90–92%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "A-"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-nearest-midpoint-up",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "plus-minus",
          "match": "nearest",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "A-",
          "matchedGpa": 3.67,
          "tie": true,
          "value": "A-"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": "nearest",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "A-",
          "matchedGpa": 3.67,
          "pct": "90–92%",
          "tie": true,
          "credits": null,
          "qualityPoints": null,
          "value": "A-"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-floor",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "plus-minus",
          "match": "floor",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "B+",
          "matchedGpa": 3.33,
          "tie": false,
          "value": "B+"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": "floor",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "B+",
          "matchedGpa": 3.33,
          "pct": "87–89%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "B+"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-flat",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "flat",
          "match": "nearest",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "A",
          "matchedGpa": 4,
          "tie": true,
          "value": "A"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "flat",
          "scaleLabel": "Flat 4.0",
          "match": "nearest",
          "inputGpa": 3.5,
          "gpa": 3.5,
          "normalized": false,
          "letter": "A",
          "matchedGpa": 4,
          "pct": "90–100%",
          "tie": true,
          "credits": null,
          "qualityPoints": null,
          "value": "A"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-linear5",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "linear5",
          "match": "nearest",
          "inputGpa": 4.6,
          "gpa": 3.6799999999999997,
          "normalized": true,
          "letter": "A-",
          "matchedGpa": 3.67,
          "tie": false,
          "value": "A-"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "linear5",
          "scaleLabel": "Linear 5.0",
          "match": "nearest",
          "inputGpa": 4.6,
          "gpa": 3.6799999999999997,
          "normalized": true,
          "letter": "A-",
          "matchedGpa": 3.67,
          "pct": "90–92%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "A-"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-to-gpa",
        "reference": {
          "status": "ok",
          "mode": "to-gpa",
          "scale": "plus-minus",
          "letter": "B+",
          "gpa": 3.33,
          "matchedGpa": 3.33,
          "value": 3.33,
          "credits": null,
          "qualityPoints": null,
          "tie": false,
          "normalized": false
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-gpa",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": null,
          "inputGpa": null,
          "gpa": 3.33,
          "normalized": false,
          "letter": "B+",
          "matchedGpa": 3.33,
          "pct": "87–89%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": 3.33,
          "legacyScale": null
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "g-quality-points",
        "reference": {
          "status": "ok",
          "mode": "to-gpa",
          "scale": "plus-minus",
          "letter": "B+",
          "gpa": 3.33,
          "matchedGpa": 3.33,
          "value": 3.33,
          "credits": 3,
          "qualityPoints": 9.99,
          "tie": false,
          "normalized": false
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-gpa",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": null,
          "inputGpa": null,
          "gpa": 3.33,
          "normalized": false,
          "letter": "B+",
          "matchedGpa": 3.33,
          "pct": "87–89%",
          "tie": false,
          "credits": 3,
          "qualityPoints": 9.99,
          "value": 3.33,
          "legacyScale": null
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "golden"
      },
      {
        "id": "b-zero",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "plus-minus",
          "match": "nearest",
          "inputGpa": 0,
          "gpa": 0,
          "normalized": false,
          "letter": "F",
          "matchedGpa": 0,
          "tie": false,
          "value": "F"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": "nearest",
          "inputGpa": 0,
          "gpa": 0,
          "normalized": false,
          "letter": "F",
          "matchedGpa": 0,
          "pct": "0–59%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "F"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "boundary"
      },
      {
        "id": "b-plus-minus-max",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "plus-minus",
          "match": "nearest",
          "inputGpa": 4.33,
          "gpa": 4.33,
          "normalized": false,
          "letter": "A+",
          "matchedGpa": 4.33,
          "tie": false,
          "value": "A+"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "plus-minus",
          "scaleLabel": "Plus/minus 4.33",
          "match": "nearest",
          "inputGpa": 4.33,
          "gpa": 4.33,
          "normalized": false,
          "letter": "A+",
          "matchedGpa": 4.33,
          "pct": "97–100%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "A+"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "boundary"
      },
      {
        "id": "b-linear5-max",
        "reference": {
          "status": "ok",
          "mode": "to-letter",
          "scale": "linear5",
          "match": "nearest",
          "inputGpa": 5,
          "gpa": 4,
          "normalized": true,
          "letter": "A",
          "matchedGpa": 4,
          "tie": false,
          "value": "A"
        },
        "actual": {
          "status": "ok",
          "code": null,
          "message": null,
          "mode": "to-letter",
          "scale": "linear5",
          "scaleLabel": "Linear 5.0",
          "match": "nearest",
          "inputGpa": 5,
          "gpa": 4,
          "normalized": true,
          "letter": "A",
          "matchedGpa": 4,
          "pct": "93–96%",
          "tie": false,
          "credits": null,
          "qualityPoints": null,
          "value": "A"
        },
        "error_ulp": null,
        "threshold_ulp": 8,
        "suite": "boundary"
      },
      {
        "id": "meta-linear5-normalization",
        "reference": 1,
        "actual": 1,
        "error_ulp": 0,
        "threshold_ulp": 8,
        "suite": "metamorphic",
        "hops": {
          "base": {
            "reference": {
              "status": "ok",
              "mode": "to-letter",
              "scale": "plus-minus",
              "match": "nearest",
              "inputGpa": 3.68,
              "gpa": 3.68,
              "normalized": false,
              "letter": "A-",
              "matchedGpa": 3.67,
              "tie": false,
              "value": "A-"
            },
            "actual": {
              "status": "ok",
              "code": null,
              "message": null,
              "mode": "to-letter",
              "scale": "plus-minus",
              "scaleLabel": "Plus/minus 4.33",
              "match": "nearest",
              "inputGpa": 3.68,
              "gpa": 3.68,
              "normalized": false,
              "letter": "A-",
              "matchedGpa": 3.67,
              "pct": "90–92%",
              "tie": false,
              "credits": null,
              "qualityPoints": null,
              "value": "A-"
            },
            "error_ulp": null
          },
          "follow": {
            "reference": {
              "status": "ok",
              "mode": "to-letter",
              "scale": "linear5",
              "match": "nearest",
              "inputGpa": 4.6,
              "gpa": 3.6799999999999997,
              "normalized": true,
              "letter": "A-",
              "matchedGpa": 3.67,
              "tie": false,
              "value": "A-"
            },
            "actual": {
              "status": "ok",
              "code": null,
              "message": null,
              "mode": "to-letter",
              "scale": "linear5",
              "scaleLabel": "Linear 5.0",
              "match": "nearest",
              "inputGpa": 4.6,
              "gpa": 3.6799999999999997,
              "normalized": true,
              "letter": "A-",
              "matchedGpa": 3.67,
              "pct": "90–92%",
              "tie": false,
              "credits": null,
              "qualityPoints": null,
              "value": "A-"
            },
            "error_ulp": null
          },
          "relation": {
            "reference": 1,
            "actual": 1,
            "error_ulp": 0
          }
        }
      }
    ]
  },
  "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."
  },
  "artifacts": {
    "evidence_bundle_sha256": "b15f2cd953b174c04b14b29bd459debd66fdcf2d7ad6ba1709009b386494978d",
    "evidence_digest": "ec136afa8532f4c4eba7323dccaee3ebb0dd350501757559013ab305b712242e",
    "production_sha256": "1d85769a84c3c2dae1be22be2327b7597b376eab7bd4215d31b26b062abb3454",
    "attested_catalog_sha256": "9821b7afa172f562d1bf6535638d38ab8e6044ea84139444872d6c19047d1d21",
    "production_checks": [
      {
        "id": "education.gpa_letter:output-const",
        "status": "pass",
        "detail": "output const 1.1.3 vs capability 1.1.3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:evidence-sha256",
        "status": "pass",
        "detail": "825abfee94ac",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:semantic-contract",
        "status": "pass",
        "detail": "16/16",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:capability-html-public-origin-agree",
        "status": "pass",
        "detail": "public 1.1.3 vs origin 1.1.3",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:cvp-manifest-public-origin-agree",
        "status": "pass",
        "detail": "education.gpa_letter/1.1.3/2026-09-29.release-truth-v1/core/ec136afa8532",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z",
        "projection_compared": false
      },
      {
        "id": "education.gpa_letter:cvp-latest-alias-agrees",
        "status": "pass",
        "detail": "education.gpa_letter/1.1.3/2026-09-29.release-truth-v1/core/ec136afa8532",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z",
        "projection_compared": false
      },
      {
        "id": "education.gpa_letter:cvp-immutable-manifest-fetch",
        "status": "pass",
        "detail": "public=200 origin=200",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:cvp-immutable-manifest-sha256",
        "status": "pass",
        "detail": "ec136afa8532",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:cvp-latest-alias-matches-immutable",
        "status": "pass",
        "detail": "education.gpa_letter/1.1.3/2026-09-29.release-truth-v1/core/ec136afa8532",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z",
        "projection_compared": false
      },
      {
        "id": "education.gpa_letter:calculator-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      },
      {
        "id": "education.gpa_letter:evidence-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-29T02:27:43.899Z"
      }
    ],
    "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": "ec136afa8532f4c4eba7323dccaee3ebb0dd350501757559013ab305b712242e",
          "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": "ec136afa8532f4c4eba7323dccaee3ebb0dd350501757559013ab305b712242e",
          "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": "825abfee94acc2f690c71cd87d50721d032487ca5984c8925b513291b468adbe",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "9821b7afa172f562d1bf6535638d38ab8e6044ea84139444872d6c19047d1d21",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "ec136afa8532f4c4eba7323dccaee3ebb0dd350501757559013ab305b712242e"
  },
  "dependencies": [
    {
      "name": "gpa-letter-engine",
      "version": "1.1.3"
    },
    {
      "name": "gpa-letter-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "node",
      "version": "22.20.0"
    }
  ],
  "attestation": {
    "status": "CURRENT",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "32b8c8fc001c8156e721d1985f9285c24b4eb39419f1b706b7f4999d46ee806a",
    "attested_at": "2026-09-29T02:27:43.899Z",
    "last_confirmed_current_at": "2026-09-29T02:57:46.783Z",
    "site_attestation_current": false,
    "capability_attestation_current": true,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-09-29T02:57:46.783Z",
    "live_updated_at": "2026-09-29T02:58:21.722Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-09-29T02:57:46.783Z",
      "site_stale_count": 3
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 3,
    "site_stale_capability_count": 3,
    "evidence_attested_at": "2026-09-29T02:27:43.899Z"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.1.3",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-09-29T02:27:43.899Z",
    "generated_at": "2026-09-29T02:27:43.899Z",
    "rendered_at": "2026-09-29T02:58:21.921Z",
    "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/education.gpa_letter/1.1.3.json",
    "evidence_page": "https://www.calculatorx.com/evidence/education.gpa_letter/1.1.3",
    "calculator": "https://www.calculatorx.com/calc/grade/gpa-to-letter",
    "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/education.gpa_letter/1.1.3.cvp.json",
    "manifest_immutable": "https://www.calculatorx.com/evidence/education.gpa_letter/1.1.3/2026-09-29.release-truth-v1.cvp.json",
    "manifest_core": "https://www.calculatorx.com/evidence/education.gpa_letter/1.1.3/2026-09-29.release-truth-v1.ec136afa8532.cvp.json"
  }
}