{ "protocol": { "name": "CVP", "version": "1.0.0-proposed" }, "document_status": "proposed", "calculator": { "id": "pcb-trace-width", "version": "1.1.1", "title": "PCB Trace Width Calculator", "formula_family": "ipc-2221-trace", "capability_id": "electrical.pcb.trace_width", "verification_revision": "2026-09-11.schema-coverage-u" }, "profile": "engineering", "status": "VERIFIED", "runner": { "name": "cvp-runner", "version": "1.0.0" }, "environment": { "runtime": "node", "runtime_version": "22.23.2", "numeric_model": "IEEE-754 binary64", "os": "linux" }, "suite": { "id": "pcb-trace-width", "version": "1.1.1", "uri": "https://www.calculatorx.com/evidence/electrical.pcb.trace_width/1.1.1.json", "verification_revision": "2026-09-11.schema-coverage-u" }, "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": "IPC-2221 — Generic Standard on Printed Board Design", "kind": "standard", "reference": "Conductor width and current capacity (external/internal k factors)" }, { "label": "IPC-2152 — Standard for Determining Current-Carrying Capacity in Printed Board Design", "kind": "standard", "reference": "Updated current-carrying methodology" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "IPC-2221 PCB trace width / ampacity" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module PCB trace-width oracle — same V8 binary64 as IUT", "engine": { "name": "pcb-trace-width-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP width_mil / I comparison vs IUT", "engine": { "name": "pcb-trace-width-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": "IPC-2221 I = k·ΔT^0.44·A^0.725; external/internal k" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "IPC-2221 chart model — not IPC-2152; u_* deferred" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "mil, oz/ft², °C, A" }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "3/3 legacy golden; 3/3 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "5/5 CVP boundary · 6/6 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 (width-external, width-internal, current, invalid-domain) · 3 legacy golden / 5 CVP boundary unique cases · 4 Evidence invalid-input (may overlap boundary)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "6/6 contract checks" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine pcb-trace-width; 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 @ 2026-09-11T06:03:54.464Z · live site-wide report stale @ 2026-09-11T06:03:56.417Z (4 other capabilities) · local checks pass · attestation_id=a87334aa9ed4564c6f0875d2943e364ac942bb7b7edf05fb204d0e9d434134e2 · This calculator CURRENT · Bound attestation PASS @ 2026-09-11T06:03:54.464Z · Live site report STALE (4 capabilities; 152 remain CURRENT) @ 2026-09-11T06:03:56.417Z · Public schema 1.1.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.1.1 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · cvp-immutable-manifest-fetch=pass · cvp-immutable-manifest-sha256=pass · cvp-latest-alias-matches-immutable=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=75eb658f5a2a7986aa44ee2dadf15a3e19122fe7dcb44ca0ac48573f142c77ae · verified_at=2026-09-11T05:48:32.753Z · evidence_attested_at=2026-09-11T03:26:54.926Z · last_confirmed_current_at=2026-09-11T06:03:54.464Z · rendered_at=2026-09-11T06:03:56.451Z · binds=evidence_digest" }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Current ↔ cross-section area" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "6/6 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": "PASS", "applicability": "optional", "notes": "expert_reviewed=true" } }, "tests": { "golden": { "passed": 3, "total": 3, "failed": 0, "case_ids": [ "g-ext", "g-int", "g-current" ] }, "boundary": { "passed": 5, "total": 5, "failed": 0, "case_ids": [ "missing-I", "zero-dT", "boundary-external-10a", "boundary-unc-I-dT", "boundary-unc-k-without-u" ] }, "invalid": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "missing-I", "zero-dT", "bad-layer", "boundary-unc-k-without-u" ] }, "property": { "passed": 6, "total": 6, "failed": 0, "case_ids": [ "property-width", "property-roundtrip", "property-internal", "property-more-I", "property-uncertainty-compose", "property-no-unc-omit" ], "kind": "fixed" }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "contract": { "passed": 6, "total": 6, "failed": 0 }, "cross_interface": { "passed": 1, "total": 1, "failed": 0, "case_ids": [ "iface-ext" ] } }, "coverage": { "partitions": [ { "id": "width-external", "description": "Width external", "exercised": true, "case_count": 10 }, { "id": "width-internal", "description": "Width internal", "exercised": true, "case_count": 2 }, { "id": "current", "description": "Current from width", "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": "IPC-2221 power law; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-ext", "reference": { "mode": "width", "layer": "external", "I": 10, "width_mil": 283.2319087512239, "width_mm": 7.194090482281086, "area_mil2": 390.29357025918654, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.048 }, "actual": { "mode": "width", "layer": "external", "I": 10, "width_mil": 283.2319087512239, "width_mm": 7.194090482281086, "area_mil2": 390.29357025918654, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.048 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-int", "reference": { "mode": "width", "layer": "internal", "I": 10, "width_mil": 736.8107715863429, "width_mm": 18.71499359829311, "area_mil2": 1015.3252432459805, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.024 }, "actual": { "mode": "width", "layer": "internal", "I": 10, "width_mil": 736.8107715863429, "width_mm": 18.71499359829311, "area_mil2": 1015.3252432459805, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.024 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-current", "reference": { "mode": "current", "layer": "external", "I": 10, "width_mil": 283.2319087512239, "width_mm": 7.194090482281086, "area_mil2": 390.2935702591865, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.048 }, "actual": { "mode": "current", "layer": "external", "I": 10, "width_mil": 283.2319087512239, "width_mm": 7.194090482281086, "area_mil2": 390.2935702591865, "dT": 10, "copper_oz": 1, "thickness_mil": 1.378, "k": 0.048 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" } ] }, "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": "7f43e23f5c7209fcf0080a209ca02ac9b2af0d76fbb64c8cdd7c80b921c6bdac", "evidence_digest": "5252bebde7a8f47aeb752840457d04ac1a92b2f50b471c09245b3a3c2ac75a97", "production_sha256": "75eb658f5a2a7986aa44ee2dadf15a3e19122fe7dcb44ca0ac48573f142c77ae", "attested_catalog_sha256": "dfecb6d8c9caa3b60d2fd537df9c1d72e0689bb5ea421456ca7507c4af2a7bf4", "production_checks": [ { "id": "electrical.pcb.trace_width:output-const", "status": "pass", "detail": "output const 1.1.1 vs capability 1.1.1", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:evidence-sha256", "status": "pass", "detail": "ef7955b85e33", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:semantic-contract", "status": "pass", "detail": "15/15", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.1.1 vs origin 1.1.1", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.pcb.trace_width/1.1.1/2026-09-11.schema-coverage-u/engineering/5252bebde7a8", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.pcb.trace_width:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.pcb.trace_width/1.1.1/2026-09-11.schema-coverage-u/engineering/5252bebde7a8", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.pcb.trace_width:cvp-immutable-manifest-fetch", "status": "pass", "detail": "public=200 origin=200", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:cvp-immutable-manifest-sha256", "status": "pass", "detail": "5252bebde7a8", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:cvp-latest-alias-matches-immutable", "status": "pass", "detail": "electrical.pcb.trace_width/1.1.1/2026-09-11.schema-coverage-u/engineering/5252bebde7a8", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z", "projection_compared": false }, { "id": "electrical.pcb.trace_width:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" }, { "id": "electrical.pcb.trace_width:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-11T03:26:54.926Z" } ], "digest_registry": { "digest_algorithm": "sha256", "canonicalization": "json-sorted-keys-utf8", "entries": [ { "name": "cvp_evidence_digest", "field": "artifacts.evidence_digest", "digest_scope": "cvp_verification_fingerprint_v2", "value": "5252bebde7a8f47aeb752840457d04ac1a92b2f50b471c09245b3a3c2ac75a97", "note": "CVP suite fingerprint; independent of Evidence generated_at" }, { "name": "artifact_evidence_sha256", "field": "release_integrity.digests.evidence_core_sha256", "digest_scope": "evidence_artifact_core", "value": "ef7955b85e3332a0e79bebcef24c27348a0102f338c6eb1f67662721d91f51e4", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "dfecb6d8c9caa3b60d2fd537df9c1d72e0689bb5ea421456ca7507c4af2a7bf4", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] } }, "dependencies": [ { "name": "pcb-trace-width-engine", "version": "1.1.1" }, { "name": "pcb-trace-width-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "22.23.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "a87334aa9ed4564c6f0875d2943e364ac942bb7b7edf05fb204d0e9d434134e2", "attested_at": "2026-09-11T03:26:54.926Z", "last_confirmed_current_at": "2026-09-11T06:03:54.464Z", "site_attestation_current": false, "capability_attestation_current": true, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-09-11T06:03:54.464Z", "live_updated_at": "2026-09-11T06:03:56.417Z", "site_stale_capability_count": 4, "evidence_attested_at": "2026-09-11T03:26:54.926Z" }, "domain_review": { "status": "PASS", "reviewer_role": "electrical-engineer", "spec_version": "1.1.1", "external_third_party": false, "independence": "internal" }, "timestamps": { "verified_at": "2026-09-11T05:48:32.753Z", "generated_at": "2026-09-11T05:48:32.753Z", "rendered_at": "2026-09-11T06:03:56.451Z", "notes": "verified_at/generated_at mark the first publication of this evidence_digest (suite verification). evidence_attested_at/attested_at is the first production bind of that 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 evidence_digest. Production attestation binds evidence_digest, not rendered_at. Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at." }, "links": { "legacy_evidence": "https://www.calculatorx.com/evidence/electrical.pcb.trace_width/1.1.1.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.pcb.trace_width/1.1.1", "calculator": "https://www.calculatorx.com/calc/electric/pcb-trace-width", "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.pcb.trace_width/1.1.1.cvp.json", "manifest_immutable": "https://www.calculatorx.com/evidence/electrical.pcb.trace_width/1.1.1/2026-09-11.schema-coverage-u.cvp.json" } }