{
  "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": "pythagorean",
    "version": "1.1.6",
    "title": "Pythagorean Theorem Calculator",
    "formula_family": "pythagorean",
    "capability_id": "math.pythagorean",
    "verification_revision": "2026-10-28.meta-metrics-v2"
  },
  "profile": "engineering",
  "status": "STALE",
  "verification_status": "VERIFIED",
  "production_freshness": "STALE",
  "overall_trust": "VERIFIED_STALE",
  "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": "pythagorean",
    "version": "1.1.6",
    "uri": "https://www.calculatorx.com/evidence/math.pythagorean/1.1.6.json",
    "verification_revision": "2026-10-28.meta-metrics-v2"
  },
  "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": "Euclid, Elements, Book I, Proposition 47",
        "kind": "other",
        "reference": "In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle",
        "url": "https://mathcs.clarku.edu/~djoyce/elements/bookI/propI47.html"
      },
      {
        "label": "Right-triangle area",
        "kind": "other",
        "reference": "A = ab/2"
      }
    ]
  },
  "controls": {
    "CVP-PROV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Sources present on evidence"
    },
    "CVP-MODEL-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "a² + b² = c²"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Positive sides; solve a|b|c or verify"
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "length (consistent)"
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 model + O2 expected_values + O2 numerical_behavior"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "6/6 legacy golden; 93/93 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "10/10 CVP boundary · 10/10 legacy Evidence boundary"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "7 Evidence illegal-input + 5/5 oracle-backed error-code (exact_error_match, not ULP)"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=2; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "5/5 declared partitions (solve-c, solve-b, solve-a, verify, invalid-domain) · 6 legacy golden / 10 CVP boundary unique cases · 7 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 pythagorean; 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": "Capability production binding: STALE · Site report: stale · STALE (freshness / digest drift after last PASS snapshot) · site report stale · local checks pass · local production checks PASS; capability production binding is not CURRENT — final status must stay STALE, not VERIFIED · attestation_id=f3abb5d04ebc51171f259234b69628b210f1534445c968974f68a48041bc5e07 · previous live site report said CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-10-28T05:32:35.458Z · Live production status STALE (210 capabilities; 166 remain CURRENT) @ 2026-10-28T10:42:42.046Z · Public schema 1.1.6 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.1.6 · 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=0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae · verified_at=2026-10-28T10:42:42.632Z · evidence_attested_at=2026-10-28T10:42:42.632Z · last_confirmed_current_at=2026-10-28T10:42:42.632Z · rendered_at=2026-10-28T10:42:42.632Z · binds=cvp_core_sha256 · attestation snapshot core b4e2795757fd ≠ live cvp_core_sha256 4e661f033102 (2026-10-28.meta-metrics-v2)",
      "check_result": "PASS",
      "production_state": "STALE",
      "binding_current": false
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "right triangle"
    },
    "CVP-PROP-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "2/2 property"
    },
    "CVP-META-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "2/2 metamorphic; domain=1; input-contract=1; limited to assessed relations/preconditions"
    },
    "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"
    }
  },
  "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": "81c794e64f7f545059d61afe31cd63fceb534a2fd98b818edf72a85660c48e07",
    "evidence_digest": "4e661f033102d57e25604c76c92b099170b889cd33df23f00e2c46ec22307d0c",
    "production_sha256": "0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae",
    "attested_catalog_sha256": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c",
    "production_checks": [
      {
        "id": "math.pythagorean:output-const",
        "status": "pass",
        "detail": "output const 1.1.6 vs capability 1.1.6",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:evidence-sha256",
        "status": "pass",
        "detail": "b480debe4121",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:semantic-contract",
        "status": "pass",
        "detail": "16/16",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:capability-html-public-origin-agree",
        "status": "pass",
        "detail": "public 1.1.6 vs origin 1.1.6",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:cvp-manifest-public-origin-agree",
        "status": "pass",
        "detail": "math.pythagorean/1.1.6/2026-10-28.meta-metrics-v2/engineering/4e661f033102",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core",
        "projection_compared": false
      },
      {
        "id": "math.pythagorean:cvp-latest-alias-agrees",
        "status": "pass",
        "detail": "math.pythagorean/1.1.6/2026-10-28.meta-metrics-v2/engineering/4e661f033102",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core",
        "projection_compared": false
      },
      {
        "id": "math.pythagorean:cvp-immutable-manifest-fetch",
        "status": "pass",
        "detail": "public=200 origin=200",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:cvp-immutable-manifest-sha256",
        "status": "pass",
        "detail": "b4e2795757fd",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:cvp-latest-alias-matches-immutable",
        "status": "pass",
        "detail": "math.pythagorean/1.1.6/2026-10-28.meta-metrics-v2/engineering/4e661f033102",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core",
        "projection_compared": false
      },
      {
        "id": "math.pythagorean:calculator-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      },
      {
        "id": "math.pythagorean:evidence-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": false,
        "attestation_binding_current": false,
        "attested_at": "2026-10-28T10:42:42.632Z",
        "attestation_revision": "core"
      }
    ],
    "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": "4e661f033102d57e25604c76c92b099170b889cd33df23f00e2c46ec22307d0c",
          "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": "4e661f033102d57e25604c76c92b099170b889cd33df23f00e2c46ec22307d0c",
          "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": "b480debe41210b4f321a40eb6c8f21cc67433d8ad5760b2c50f5e60a33e4fde0",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "4e661f033102d57e25604c76c92b099170b889cd33df23f00e2c46ec22307d0c"
  },
  "dependencies": [
    {
      "name": "pythagorean-engine",
      "version": "1.1.6"
    },
    {
      "name": "pythagorean-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "node",
      "version": "22.20.0"
    }
  ],
  "attestation": {
    "status": "STALE",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "f3abb5d04ebc51171f259234b69628b210f1534445c968974f68a48041bc5e07",
    "attested_at": "2026-10-28T10:42:42.632Z",
    "last_confirmed_current_at": "2026-10-28T10:42:42.632Z",
    "site_attestation_current": false,
    "capability_attestation_current": false,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-10-28T05:32:35.458Z",
    "live_updated_at": "2026-10-28T10:42:42.046Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-10-28T05:32:35.458Z",
      "site_stale_count": 210
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 210,
    "site_stale_capability_count": 210,
    "evidence_attested_at": "2026-10-28T10:42:42.632Z",
    "stale_reason": "attestation snapshot core b4e2795757fd ≠ live cvp_core_sha256 4e661f033102 (2026-10-28.meta-metrics-v2)"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.1.6",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-10-28T10:42:42.632Z",
    "generated_at": "2026-10-28T10:42:42.632Z",
    "rendered_at": "2026-10-28T10:42:42.632Z",
    "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."
  },
  "tests": {
    "golden": {
      "passed": 93,
      "total": 93,
      "failed": 0
    },
    "boundary": {
      "passed": 10,
      "total": 10,
      "failed": 0
    },
    "invalid": {
      "passed": 12,
      "total": 12,
      "failed": 0,
      "comparison": "exact_error_match"
    },
    "property": {
      "passed": 2,
      "total": 2,
      "failed": 0
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0
    },
    "metamorphic": {
      "passed": 2,
      "total": 2,
      "failed": 0
    },
    "contract": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "cross_interface": {
      "passed": 4,
      "total": 4,
      "failed": 0
    }
  },
  "numerical": {
    "representation": "binary64 real values; scaled dimensionless verification diagnostics",
    "tolerance": {
      "type": "ulp",
      "value": 4,
      "rationale": "Side,area,perimeter4ULP vs independently rounded Decimal reference; scaled residual/relative diagnostics absolute2e-15. Classification checked exactly against Decimal predicate outside2e-15 boundary uncertainty.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 2,
    "claim_scope": "93 independent full result packs across4operations and extreme scales; no exhaustive-domain claim"
  },
  "coverage": {
    "partitions": [
      {
        "id": "solve-c",
        "description": "Solve hypotenuse c",
        "exercised": true,
        "case_count": 46
      },
      {
        "id": "solve-b",
        "description": "Solve leg b",
        "exercised": true,
        "case_count": 15
      },
      {
        "id": "solve-a",
        "description": "Solve leg a",
        "exercised": true,
        "case_count": 16
      },
      {
        "id": "verify",
        "description": "Verify a²+b²=c²",
        "exercised": true,
        "case_count": 27
      },
      {
        "id": "invalid-domain",
        "description": "Invalid inputs",
        "exercised": true,
        "case_count": 12
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "Pythagorean theorem for right triangles"
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Independent cross-runtime Decimal complete-result reference",
        "engine": {
          "name": "CPython Decimal precision2000",
          "independent_of_iut": true,
          "same_runtime_as_iut": false,
          "generator_sha256": "41e30b27c9ea3eb2e5d730452e82c90044d18523f75ee78207d1d80da131a8e6"
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Independent cross-runtime Decimal complete-result reference",
        "engine": {
          "name": "CPython Decimal precision2000",
          "independent_of_iut": true,
          "same_runtime_as_iut": false,
          "generator_sha256": "41e30b27c9ea3eb2e5d730452e82c90044d18523f75ee78207d1d80da131a8e6"
        }
      }
    ]
  },
  "links": {
    "legacy_evidence": "https://www.calculatorx.com/evidence/math.pythagorean/1.1.6.json",
    "evidence_page": "https://www.calculatorx.com/evidence/math.pythagorean/1.1.6",
    "calculator": "https://www.calculatorx.com/calc/math/pythagorean",
    "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/math.pythagorean/1.1.6.cvp.json",
    "manifest_immutable": "https://www.calculatorx.com/evidence/math.pythagorean/1.1.6/2026-10-28.meta-metrics-v2.cvp.json",
    "manifest_core": "https://www.calculatorx.com/evidence/math.pythagorean/1.1.6/2026-10-28.meta-metrics-v2.4e661f033102.cvp.json"
  },
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary"
  }
}