{ "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": "type-b", "version": "1.0.0", "title": "Type B Uncertainty Calculator", "formula_family": "type-b-ub", "capability_id": "engineering.uncertainty.type_b", "verification_revision": "2026-09-16.o2-o3" }, "profile": "engineering", "verified_scope": "Type B u_B from half-width a: rectangular a/√3 (uniform alias) and triangular a/√6 + O3 mpmath tabulated u_B.", "deferred_scope": "Not GUM RSS of several uᵢ, not trapezoidal / U-shaped, not Monte Carlo, and not a standalone Combined/Expanded page.", "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": "type-b", "version": "1.0.0", "uri": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/1.0.0.json", "verification_revision": "2026-09-16.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": "JCGM 100:2008 (GUM) — Evaluation of measurement data", "kind": "standard", "reference": "4.3.7 Rectangular distribution", "url": "https://www.bipm.org/en/committees/jc/jcgm/publications" }, { "label": "JCGM 100:2008 (GUM) — Evaluation of measurement data", "kind": "standard", "reference": "4.3.9 Triangular distribution", "url": "https://www.bipm.org/utils/common/pdf/jcgm/JCGM_100_2008_E.pdf" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Type B standard uncertainty u_B = a/√3 or a/√6" }, { "class": "O3", "reference_scope": "expected_values", "scope": "expected_values", "label": "Precomputed mpmath high-precision Type B (80 dps) rounded to nearest binary64 — not V8 hypot", "engine": { "name": "type-b-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": "0033671b03acdd8364affc573f1c3fc403afa8c0407f977c9362b9581d4a20ac", "table_sha256": "f08068b5c7c20a016fc09d5ae27fb9d0c8bec9e522b914e5392d03dc63776c06", "seed": "20260916.type-b-o3", "source": "https://www.calculatorx.com/developers/cvp/reproduce/type-b-o3-tables.json", "public_table": "/developers/cvp/reproduce/type-b-o3-tables.json", "public_generator": "/developers/cvp/reproduce/generate-type-b-o3.py" } }, { "class": "O3", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O3 table vs IUT u_B; ≤2 ULP on tabulated vectors only", "engine": { "name": "type-b-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": "0033671b03acdd8364affc573f1c3fc403afa8c0407f977c9362b9581d4a20ac", "table_sha256": "f08068b5c7c20a016fc09d5ae27fb9d0c8bec9e522b914e5392d03dc63776c06", "seed": "20260916.type-b-o3", "source": "https://www.calculatorx.com/developers/cvp/reproduce/type-b-o3-tables.json", "public_table": "/developers/cvp/reproduce/type-b-o3-tables.json", "public_generator": "/developers/cvp/reproduce/generate-type-b-o3.py" } }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module Type B oracle — same V8 binary64 as IUT", "engine": { "name": "type-b-uncertainty-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP u_B comparison vs IUT", "engine": { "name": "type-b-uncertainty-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": "Type B u_B = a/√3 or a/√6; O3 tabulated u_B" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Single Type B component. Not GUM combination. Not trapezoidal. O3 tabulated vectors only." }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "Homogeneous implied unit on a. No implicit conversion." }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior + O3 tabulated Type B" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "1/1 legacy golden; 5/5 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "4/4 CVP boundary · 4/4 legacy Evidence boundary" }, "CVP-INV-01": { "result": "PASS", "applicability": "required", "notes": "3 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": "6/6 partitions (rectangular, triangular, uniform-alias, default-dist, half-width-alias, invalid-domain)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "4/4 CVP contract" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine type-b; 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 @ 2026-09-16T23:18:54.751Z · live site-wide report stale @ 2026-09-16T23:18:57.224Z (4 other capabilities) · local checks pass · attestation_id=bf3fe5ab59e4bbc9e50f340c6c537d3cf046a9b32473980b03131666eea4e751 · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-09-16T23:18:54.751Z · Live production status STALE (4 capabilities; 160 remain CURRENT) @ 2026-09-16T23:18:57.224Z · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.0.0 · 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=58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5 · verified_at=2026-09-16T04:04:55.627Z · evidence_attested_at=2026-09-16T04:04:55.627Z · last_confirmed_current_at=2026-09-16T23:18:54.751Z · rendered_at=2026-09-16T23:18:57.261Z · binds=cvp_core_sha256", "check_result": "PASS", "production_state": "CURRENT", "binding_current": true }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Type B standard uncertainty" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "3/3 property · enumerated fixed assertions (not generated; no seed)" }, "CVP-META-01": { "result": "PASS", "applicability": "applicable", "notes": "2/2 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: u_B = a/√3 (rectangular) or a/√6 (triangular) vs separate-module identities (≤2 ULP). Not GUM combination, not trapezoidal, not Monte Carlo. ≤2 ULP vs O3 applies only to the published tabulated Type B vectors (rectangular, triangular, default, uniform alias, a=1, a=0.5 triangular, scale, half_width). It is not a whole-domain Type B guarantee and does not cover trapezoidal." }, "CVP-EXP-01": { "result": "SKIP", "applicability": "optional", "notes": "named expert review not performed" } }, "tests": { "golden": { "passed": 5, "total": 5, "failed": 0, "case_ids": [ "g-rect", "g-tri", "g-default", "g-uniform", "g-hw" ] }, "boundary": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "boundary-type-b-tri", "boundary-type-b-missing", "boundary-type-b-a", "boundary-type-b-dist" ] }, "invalid": { "passed": 7, "total": 7, "failed": 0, "case_ids": [ "boundary-type-b-missing", "boundary-type-b-a", "boundary-type-b-dist", "inv-missing", "inv-a", "inv-trap", "inv-neg" ], "comparison": "exact_error_match", "records": [ { "id": "inv-missing", "comparison": "exact_error_match", "expected": { "code": "MISSING_REQUIRED_INPUT" }, "actual": { "code": "MISSING_REQUIRED_INPUT" }, "match": true }, { "id": "inv-a", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true }, { "id": "inv-trap", "comparison": "exact_error_match", "expected": { "code": "INVALID_INPUT" }, "actual": { "code": "INVALID_INPUT" }, "match": true }, { "id": "inv-neg", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true } ] }, "property": { "passed": 3, "total": 3, "failed": 0, "case_ids": [ "prop-rect", "prop-tri", "prop-uniform" ], "kind": "fixed", "claim_scope": "Enumerated identities: a=3 rectangular → 3/√3; triangular → 3/√6; uniform aliases rectangular. Not generated property tests.", "definition_ids": [ "ub-a-over-sqrt-3", "ub-a-over-sqrt-6", "uniform-aliases-rectangular" ] }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "meta-scale", "meta-tri-scale" ], "definition_ids": [ "homogeneous-scale", "homogeneous-scale-triangular" ] }, "contract": { "passed": 4, "total": 4, "failed": 0 }, "cross_interface": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "iface-rect", "iface-tri", "iface-default", "iface-invalid-trap" ] }, "o3": { "passed": 8, "total": 8, "failed": 0, "case_ids": [ "o3-rect", "o3-tri", "o3-default", "o3-uniform", "o3-one", "o3-half", "o3-scale", "o3-hw" ], "generator_id": "type-b-mpmath-o3", "seed": "20260916.type-b-o3", "table_sha256": "f08068b5c7c20a016fc09d5ae27fb9d0c8bec9e522b914e5392d03dc63776c06", "max_error_ulp": 1, "reproduce": "python3 generate-type-b-o3.py", "table_url": "/developers/cvp/reproduce/type-b-o3-tables.json", "generator_url": "/developers/cvp/reproduce/generate-type-b-o3.py", "claim_scope": "O2: u_B = a/√3 (rectangular) or a/√6 (triangular) vs separate-module identities (≤2 ULP). Not GUM combination, not trapezoidal, not Monte Carlo. ≤2 ULP vs O3 applies only to the published tabulated Type B vectors (rectangular, triangular, default, uniform alias, a=1, a=0.5 triangular, scale, half_width). It is not a whole-domain Type B guarantee and does not cover trapezoidal.", "reproduce_url": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/reproduce" } }, "coverage": { "partitions": [ { "id": "rectangular", "description": "Explicit rectangular a/√3", "exercised": true, "case_count": 7 }, { "id": "triangular", "description": "Triangular a/√6", "exercised": true, "case_count": 6 }, { "id": "uniform-alias", "description": "uniform aliases rectangular", "exercised": true, "case_count": 3 }, { "id": "default-dist", "description": "Omitted distribution defaults to rectangular", "exercised": true, "case_count": 5 }, { "id": "half-width-alias", "description": "half_width alias for a", "exercised": true, "case_count": 2 }, { "id": "invalid-domain", "description": "Invalid inputs", "exercised": true, "case_count": 7 } ] }, "numerical": { "representation": "IEEE-754 binary64", "claim_scope": "O2: u_B = a/√3 (rectangular) or a/√6 (triangular) vs separate-module identities (≤2 ULP). Not GUM combination, not trapezoidal, not Monte Carlo. ≤2 ULP vs O3 applies only to the published tabulated Type B vectors (rectangular, triangular, default, uniform alias, a=1, a=0.5 triangular, scale, half_width). It is not a whole-domain Type B guarantee and does not cover trapezoidal.", "tolerance": { "type": "ulp", "value": 2, "rationale": "Independent Type B identities vs IUT on same V8 binary64. ≤2 ULP declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 1, "records": [ { "id": "g-rect", "reference": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 0, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 0 }, "a": { "ok": true, "error_ulp": 0 }, "distribution": { "ok": true, "error_ulp": 0 } }, "suite": "golden" }, { "id": "g-tri", "reference": { "u_B": 1.2247448713915892, "a": 3, "distribution": "triangular" }, "actual": { "u_B": 1.2247448713915892, "a": 3, "distribution": "triangular" }, "error_ulp": 0, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 0 }, "a": { "ok": true, "error_ulp": 0 }, "distribution": { "ok": true, "error_ulp": 0 } }, "suite": "golden" }, { "id": "g-default", "reference": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 0, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 0 }, "a": { "ok": true, "error_ulp": 0 }, "distribution": { "ok": true, "error_ulp": 0 } }, "suite": "golden" }, { "id": "g-uniform", "reference": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 0, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 0 }, "a": { "ok": true, "error_ulp": 0 }, "distribution": { "ok": true, "error_ulp": 0 } }, "suite": "golden" }, { "id": "g-hw", "reference": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 0, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 0 }, "a": { "ok": true, "error_ulp": 0 }, "distribution": { "ok": true, "error_ulp": 0 } }, "suite": "golden" }, { "id": "meta-scale", "reference": 2, "actual": 2, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 0 }, "follow": { "reference": { "u_B": 3.464101615137755, "a": 6, "distribution": "rectangular" }, "actual": { "u_B": 3.464101615137755, "a": 6, "distribution": "rectangular" }, "error_ulp": 0 }, "relation": { "reference": 2, "actual": 2, "error_ulp": 0 } } }, { "id": "meta-tri-scale", "reference": 2, "actual": 2, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "u_B": 1.2247448713915892, "a": 3, "distribution": "triangular" }, "actual": { "u_B": 1.2247448713915892, "a": 3, "distribution": "triangular" }, "error_ulp": 0 }, "follow": { "reference": { "u_B": 2.4494897427831783, "a": 6, "distribution": "triangular" }, "actual": { "u_B": 2.4494897427831783, "a": 6, "distribution": "triangular" }, "error_ulp": 0 }, "relation": { "reference": 2, "actual": 2, "error_ulp": 0 } } }, { "id": "o3-rect", "reference": { "oracle_layer": "analytic", "u_B": 1.7320508075688772, "a": 3 }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-tri", "reference": { "oracle_layer": "analytic", "u_B": 1.224744871391589, "a": 3 }, "actual": { "u_B": 1.2247448713915892, "a": 3, "distribution": "triangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-default", "reference": { "oracle_layer": "analytic", "u_B": 1.7320508075688772, "a": 3 }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-uniform", "reference": { "oracle_layer": "analytic", "u_B": 1.7320508075688772, "a": 3 }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-one", "reference": { "oracle_layer": "analytic", "u_B": 0.5773502691896257, "a": 1 }, "actual": { "u_B": 0.5773502691896258, "a": 1, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-half", "reference": { "oracle_layer": "analytic", "u_B": 0.2041241452319315, "a": 0.5 }, "actual": { "u_B": 0.20412414523193154, "a": 0.5, "distribution": "triangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-scale", "reference": { "oracle_layer": "analytic", "u_B": 3.4641016151377544, "a": 6 }, "actual": { "u_B": 3.464101615137755, "a": 6, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "ok": true, "error_ulp": 0 } }, "suite": "o3" }, { "id": "o3-hw", "reference": { "oracle_layer": "analytic", "u_B": 1.7320508075688772, "a": 3 }, "actual": { "u_B": 1.7320508075688774, "a": 3, "distribution": "rectangular" }, "error_ulp": 1, "threshold_ulp": 2, "fields": { "u_B": { "ok": true, "error_ulp": 1 }, "a": { "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": "5c0c45d773f7270be498f60ad1e200089572b90d50d77f6e122c3e56edd0bb50", "evidence_digest": "47360ca02434f17a5616db54b3bc18ee63b87b218479be2357fe84edd21c5509", "production_sha256": "58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5", "attested_catalog_sha256": "006a786d7fd29244ed7da1c582af2a6072358ff25a2e07cbc8909b3ae65fb0af", "production_checks": [ { "id": "engineering.uncertainty.type_b:output-const", "status": "pass", "detail": "output const 1.0.0 vs capability 1.0.0", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:evidence-sha256", "status": "pass", "detail": "6ea1dbc00818", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:semantic-contract", "status": "pass", "detail": "8/8", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.0.0 vs origin 1.0.0", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:cvp-manifest-public-origin-agree", "status": "pass", "detail": "engineering.uncertainty.type_b/1.0.0/2026-09-16.o2-o3/engineering/47360ca02434", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z", "projection_compared": false }, { "id": "engineering.uncertainty.type_b:cvp-latest-alias-agrees", "status": "pass", "detail": "engineering.uncertainty.type_b/1.0.0/2026-09-16.o2-o3/engineering/47360ca02434", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z", "projection_compared": false }, { "id": "engineering.uncertainty.type_b:cvp-immutable-manifest-fetch", "status": "pass", "detail": "public=200 origin=200", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:cvp-immutable-manifest-sha256", "status": "pass", "detail": "47360ca02434", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:cvp-latest-alias-matches-immutable", "status": "pass", "detail": "engineering.uncertainty.type_b/1.0.0/2026-09-16.o2-o3/engineering/47360ca02434", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z", "projection_compared": false }, { "id": "engineering.uncertainty.type_b:cvp-reproduce-manifest-agree", "status": "pass", "detail": "2026-09-16.o2-o3 · f08068b5c7c2", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" }, { "id": "engineering.uncertainty.type_b:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T04:04:55.627Z" } ], "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": "47360ca02434f17a5616db54b3bc18ee63b87b218479be2357fe84edd21c5509", "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": "47360ca02434f17a5616db54b3bc18ee63b87b218479be2357fe84edd21c5509", "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": "6ea1dbc0081897dd247e8615c15b69eeb5d66536311863e9d041b5debcbffa47", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "006a786d7fd29244ed7da1c582af2a6072358ff25a2e07cbc8909b3ae65fb0af", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] }, "cvp_core_sha256": "47360ca02434f17a5616db54b3bc18ee63b87b218479be2357fe84edd21c5509" }, "dependencies": [ { "name": "type-b-engine", "version": "1.0.0" }, { "name": "type-b-reference-oracle", "version": "1.0.0" }, { "name": "type-b-mpmath-o3-table", "version": "type-b-mpmath-o3" }, { "name": "node", "version": "20.19.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "bf3fe5ab59e4bbc9e50f340c6c537d3cf046a9b32473980b03131666eea4e751", "attested_at": "2026-09-16T04:04:55.627Z", "last_confirmed_current_at": "2026-09-16T23:18:54.751Z", "site_attestation_current": false, "capability_attestation_current": true, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-09-16T23:18:54.751Z", "live_updated_at": "2026-09-16T23:18:57.224Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-09-16T23:18:54.751Z", "site_stale_count": 4 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 4, "site_stale_capability_count": 4, "evidence_attested_at": "2026-09-16T04:04:55.627Z" }, "domain_review": { "status": "ABSENT", "spec_version": "1.0.0", "external_third_party": false, "note": "Named expert review not performed" }, "timestamps": { "verified_at": "2026-09-16T04:04:55.627Z", "generated_at": "2026-09-16T04:04:55.627Z", "rendered_at": "2026-09-16T23:18:57.261Z", "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.type_b/1.0.0.json", "evidence_page": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/1.0.0", "calculator": "https://www.calculatorx.com/calc/engineering/type-b-uncertainty", "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.type_b/1.0.0.cvp.json", "manifest_immutable": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/1.0.0/2026-09-16.o2-o3.cvp.json", "reproduce": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/reproduce", "o3_table": "https://www.calculatorx.com/developers/cvp/reproduce/type-b-o3-tables.json", "o3_generator": "https://www.calculatorx.com/developers/cvp/reproduce/generate-type-b-o3.py", "manifest_core": "https://www.calculatorx.com/evidence/engineering.uncertainty.type_b/1.0.0/2026-09-16.o2-o3.47360ca02434.cvp.json" } }