{ "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": "watt-volt-amp", "version": "1.5.1", "title": "Watt Volt Amp Calculator", "formula_family": "watt-volt-amp", "capability_id": "electrical.watt_volt_amp" }, "profile": "engineering", "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": "watt-volt-amp", "version": "1.5.1", "uri": "https://www.calculatorx.com/evidence/electrical.watt_volt_amp/1.5.1.json" }, "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-IFACE-01" ], "provenance": { "mode": "direct", "sources": [ { "label": "NIST Guide to the SI (SP 811)", "kind": "other", "reference": "Watt, volt, ampere, and ohm relationships in the SI", "url": "https://www.nist.gov/pml/special-publication-811" }, { "label": "IEC 60050 — International Electrotechnical Vocabulary", "kind": "standard", "reference": "Resistance (IEV 131-12-04)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-12-04" }, { "label": "IEC 60050 — International Electrotechnical Vocabulary", "kind": "standard", "reference": "Active power (IEV 131-11-42)", "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-42" }, { "label": "BIPM SI Brochure (9th edition, version 4.01)", "kind": "other", "reference": "SI units for volt, ampere, ohm, and watt", "url": "https://www.bipm.org/en/publications/si-brochure" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Watt–volt–amp resistive solver" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module watt-volt-amp oracle — same V8 binary64 as IUT", "engine": { "name": "watt-volt-amp-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP P/V/I/R comparison vs IUT", "engine": { "name": "watt-volt-amp-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": "Any two of P,V,I,R → remaining pair" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Resistive DC identities; soft-zero on ÷0" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "W, V, A, Ω" }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "8/8 legacy golden; 4/4 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": "4 invalid-domain cases" }, "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": "4/4 declared partitions (pair-vi, with-power, with-R, invalid-domain) · 8 legacy golden / 4 CVP boundary unique cases · 4 Evidence invalid-input (may overlap boundary)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "3/3 CVP contract" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine watt-volt-amp; 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 @ 2026-09-16T23:19:01.973Z (12 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 (12 capabilities; 151 remain CURRENT) @ 2026-09-16T23:19:01.973Z · Public schema 1.5.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.5.1 · 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 · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5 · verified_at=2026-09-10T03:41:44.220Z · evidence_attested_at=2026-09-10T03:41:44.220Z · last_confirmed_current_at=2026-09-16T23:18:54.751Z · rendered_at=2026-09-16T23:19:02.007Z · binds=cvp_core_sha256", "check_result": "PASS", "production_state": "CURRENT", "binding_current": true }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Power / voltage / current / resistance" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "5/5 property" }, "CVP-META-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "No input→output transformation vectors in pack — control not in obligation set" }, "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": "CalculatorX internal domain review — not CVP-EXP-01" } }, "tests": { "golden": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "g-vi", "g-pv", "g-ir", "g-pr" ] }, "boundary": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "error-single-input", "error-empty", "nan-V", "boundary-single-wva" ] }, "invalid": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "error-single-input", "error-empty", "nan-V", "boundary-single-wva" ] }, "property": { "passed": 5, "total": 5, "failed": 0, "case_ids": [ "property-VI", "property-PV", "property-IR", "property-PR", "property-roundtrip" ], "kind": "fixed" }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "contract": { "passed": 3, "total": 3, "failed": 0 }, "cross_interface": { "passed": 1, "total": 1, "failed": 0, "case_ids": [ "iface-vi" ] } }, "coverage": { "partitions": [ { "id": "pair-vi", "description": "V+I", "exercised": true, "case_count": 4 }, { "id": "with-power", "description": "Pairs including P", "exercised": true, "case_count": 6 }, { "id": "with-R", "description": "Pairs including R (no P)", "exercised": true, "case_count": 2 }, { "id": "invalid-domain", "description": "Invalid inputs", "exercised": true, "case_count": 4 } ] }, "numerical": { "representation": "IEEE-754 binary64", "tolerance": { "type": "ulp", "value": 2, "rationale": "Watt–volt–amp resistive identities; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-vi", "reference": { "P": 1200, "V": 120, "I": 10, "R": 12 }, "actual": { "P": 1200, "V": 120, "I": 10, "R": 12 }, "error_ulp": 0, "threshold_ulp": 2 }, { "id": "g-pv", "reference": { "P": 1200, "V": 120, "I": 10, "R": 12 }, "actual": { "P": 1200, "V": 120, "I": 10, "R": 12 }, "error_ulp": 0, "threshold_ulp": 2 }, { "id": "g-ir", "reference": { "P": 600, "V": 120, "I": 5, "R": 24 }, "actual": { "P": 600, "V": 120, "I": 5, "R": 24 }, "error_ulp": 0, "threshold_ulp": 2 }, { "id": "g-pr", "reference": { "P": 100, "V": 200, "I": 0.5, "R": 400 }, "actual": { "P": 100, "V": 200, "I": 0.5, "R": 400 }, "error_ulp": 0, "threshold_ulp": 2 } ] }, "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": "776dbb175516f7655a8230ff7f08c4b9ec146339c893d47609f2d08c79a987e3", "evidence_digest": "937dea566d456ef9aea5aa505050203611e4725d506350a9fc32be64ae9a41ce", "production_sha256": "58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5", "attested_catalog_sha256": "006a786d7fd29244ed7da1c582af2a6072358ff25a2e07cbc8909b3ae65fb0af", "production_checks": [ { "id": "electrical.watt_volt_amp:output-const", "status": "pass", "detail": "output const 1.5.1 vs capability 1.5.1", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" }, { "id": "electrical.watt_volt_amp:evidence-sha256", "status": "pass", "detail": "881ad8e5e4cb", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" }, { "id": "electrical.watt_volt_amp:semantic-contract", "status": "pass", "detail": "17/17", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" }, { "id": "electrical.watt_volt_amp:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.5.1 vs origin 1.5.1", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" }, { "id": "electrical.watt_volt_amp:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.watt_volt_amp/1.5.1/-/engineering/937dea566d45", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z", "projection_compared": false }, { "id": "electrical.watt_volt_amp:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.watt_volt_amp/1.5.1/-/engineering/937dea566d45", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z", "projection_compared": false }, { "id": "electrical.watt_volt_amp:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" }, { "id": "electrical.watt_volt_amp:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-10T03:41:44.220Z" } ], "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": "937dea566d456ef9aea5aa505050203611e4725d506350a9fc32be64ae9a41ce", "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": "937dea566d456ef9aea5aa505050203611e4725d506350a9fc32be64ae9a41ce", "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": "881ad8e5e4cbdf8bc2825b8b75c30f5fb157c5db2ef221f11d7edee50c3a02f8", "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": "937dea566d456ef9aea5aa505050203611e4725d506350a9fc32be64ae9a41ce" }, "dependencies": [ { "name": "watt-volt-amp-engine", "version": "1.5.1" }, { "name": "watt-volt-amp-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "20.19.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "bf3fe5ab59e4bbc9e50f340c6c537d3cf046a9b32473980b03131666eea4e751", "attested_at": "2026-09-10T03:41:44.220Z", "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": "2026-09-16T23:19:01.973Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-09-16T23:18:54.751Z", "site_stale_count": 12 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 12, "site_stale_capability_count": 12, "evidence_attested_at": "2026-09-10T03:41:44.220Z" }, "domain_review": { "status": "ABSENT", "spec_version": "1.5.1", "external_third_party": false, "note": "Supplemental CalculatorX internal domain review — see internal_review" }, "internal_review": { "status": "PASS", "reviewer_role": "electrical-engineer", "reviewed_by": "CalculatorX electrical review", "spec_version": "1.5.1", "independence": "internal", "external_third_party": false }, "timestamps": { "verified_at": "2026-09-10T03:41:44.220Z", "generated_at": "2026-09-10T03:41:44.220Z", "rendered_at": "2026-09-16T23:19:02.007Z", "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/electrical.watt_volt_amp/1.5.1.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.watt_volt_amp/1.5.1", "calculator": "https://www.calculatorx.com/calc/electric/watt-volt-amp", "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/electrical.watt_volt_amp/1.5.1.cvp.json" } }