{ "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": "pcb-diff-impedance", "version": "1.0.0", "title": "PCB Differential Impedance Calculator", "formula_family": "coupled-microstrip", "capability_id": "electrical.pcb.diff_impedance", "verification_revision": "2026-09-13.cvp-self-consistency", "related_capability": { "capability_id": "electrical.pcb.microstrip", "relation": "shared zero-thickness microstrip Z0/εeff for W/H ≥ 1" } }, "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": "22.23.2", "numeric_model": "IEEE-754 binary64", "os": "linux" }, "suite": { "id": "pcb-diff-impedance", "version": "1.0.0", "uri": "https://www.calculatorx.com/evidence/electrical.pcb.diff_impedance/1.0.0.json", "verification_revision": "2026-09-13.cvp-self-consistency" }, "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-XCAL-01", "CVP-IFACE-01" ], "provenance": { "mode": "direct", "sources": [ { "label": "IPC-2141A / Wadell", "kind": "standard", "reference": "Coupled microstrip approximations" }, { "label": "Pozar Microwave Engineering", "kind": "other", "reference": "Microstrip / coupled lines" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Coupled microstrip Zdiff (Hammerstad/Wadell Z0 + IPC-style coupling)" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module pcb-diff-impedance oracle — same V8 binary64 as IUT", "engine": { "name": "pcb-diff-impedance-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP Zdiff comparison vs IUT", "engine": { "name": "pcb-diff-impedance-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": "Hammerstad/Wadell zero-thickness microstrip Z0 + IPC-2141A-style edge-coupling Zdiff=2·Z0·(1−0.48·e^(−0.96·S/H)). Hybrid model; not a field solver." }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Edge-coupled microstrip; S is edge-to-edge gap; H is dielectric height from trace to reference plane; zero copper thickness; homogeneous dielectric; no soldermask; no dispersion/roughness/weave." }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "Canonical W_m, H_m, S_m in metres; Z0/Zdiff in Ω. Human UI may enter mm/mil." }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "4/4 legacy golden; 4/4 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "4/4 numeric-edge Evidence + 1/1 near-singularity numeric; illegal enum/system is Invalid only" }, "CVP-INV-01": { "result": "PASS", "applicability": "required", "notes": "4 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=0; policy declared a priori" }, "CVP-COV-01": { "result": "PASS", "applicability": "required", "notes": "5/5 declared partitions (zdiff-wide, zdiff-wh-eq-1, zdiff-narrow, invalid-domain, metamorphic) · 4 legacy golden / 5 CVP boundary unique cases · 4 Evidence invalid-input (may overlap boundary)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "4/4 CVP contract" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine pcb-diff-impedance; 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 @ 2026-09-13T11:35:00.166Z · live site-wide report stale @ 2026-09-13T11:35:04.161Z (2 other capabilities) · local checks pass · attestation_id=c4df4bb073bf87955dccfbc9399f558b5ac157599dcc2ffa7f03224ca402fd8f · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-09-13T11:35:00.166Z · Current site report STALE (2 capabilities; 154 remain CURRENT) @ 2026-09-13T11:35:04.161Z · 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 · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=d8679f20af3506f0d939fc41f759265265a940cac3effc1332876304e1ad2bc0 · verified_at=2026-09-12T22:29:31.481Z · evidence_attested_at=2026-09-12T22:29:31.481Z · last_confirmed_current_at=2026-09-13T11:35:00.166Z · rendered_at=2026-09-13T11:35:04.196Z · binds=cvp_core_sha256", "check_result": "PASS", "production_state": "CURRENT", "binding_current": true }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Differential impedance" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "4/4 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": "PASS", "applicability": "applicable", "notes": "2/2 cross-calculator · xcal-z0-wide PASS vs electrical.pcb.microstrip; xcal-z0-wh-eq-1 PASS vs electrical.pcb.microstrip; xcal-z0-narrow-na N/A (W/H<1 εeff: this calculator omits Hammerstad’s 0.04·(1−u)² term used by pcb-microstrip. Z0/εeff parity is claimed only for W/H ≥ 1, where both engines share the same closed form.); xcal-er1-na N/A (electrical.pcb.microstrip rejects er≤1 (ER_MUST_BE_GT_1). This calculator allows er≥1, so εr=1 has no peer identity.)" }, "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": "SKIP", "applicability": "higher_assurance", "notes": "O2 present; O3 not required this wave" }, "CVP-EXP-01": { "result": "SKIP", "applicability": "optional", "notes": "expert_reviewed=false" } }, "tests": { "golden": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "g-zdiff", "g-zdiff-wh-eq-1", "g-zdiff-narrow", "g-zdiff-er1" ] }, "boundary": { "passed": 5, "total": 5, "failed": 0, "case_ids": [ "bad-W", "bad-H", "bad-S", "bad-er", "bnd-wh-eq-1" ] }, "invalid": { "passed": 9, "total": 9, "failed": 0, "case_ids": [ "bad-W", "bad-H", "bad-S", "bad-er", "inv-W-zero", "inv-H-zero", "inv-S-zero", "inv-S-neg", "inv-er-lt1" ], "comparison": "exact_error_match", "records": [ { "id": "inv-W-zero", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true }, { "id": "inv-H-zero", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true }, { "id": "inv-S-zero", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true }, { "id": "inv-S-neg", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true }, { "id": "inv-er-lt1", "comparison": "exact_error_match", "expected": { "code": "VALUE_MUST_BE_POSITIVE" }, "actual": { "code": "VALUE_MUST_BE_POSITIVE" }, "match": true } ] }, "property": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "prop-z-positive", "prop-scale", "prop-mono-W", "prop-mono-S" ], "kind": "fixed", "claim_scope": "Enumerated identities: Zdiff>0 and Z0>0; (W,H,S)→(kW,kH,kS) leaves Z0/εeff/Zdiff unchanged; wider W lowers Zdiff; larger S raises Zdiff. Not generated/random property tests.", "definition_ids": [ "z-positive", "scale-invariance", "W-monotone-down", "S-monotone-up" ] }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "meta-scale-10", "meta-scale-0.1" ], "definition_ids": [ "scale-invariance" ] }, "contract": { "passed": 4, "total": 4, "failed": 0 }, "cross_interface": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "iface-zdiff", "iface-W-zero" ] }, "cross_calculator": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "xcal-z0-wide", "xcal-z0-wh-eq-1" ] } }, "coverage": { "partitions": [ { "id": "zdiff-wide", "description": "W/H > 1 (wide-branch Z0)", "exercised": true, "case_count": 11 }, { "id": "zdiff-wh-eq-1", "description": "W/H = 1 (narrow/wide branch boundary)", "exercised": true, "case_count": 4 }, { "id": "zdiff-narrow", "description": "W/H < 1 (narrow-branch Z0)", "exercised": true, "case_count": 2 }, { "id": "invalid-domain", "description": "Invalid W/H/S/εr", "exercised": true, "case_count": 9 }, { "id": "metamorphic", "description": "Uniform geometry scale invariance", "exercised": true, "case_count": 2 } ] }, "numerical": { "representation": "IEEE-754 binary64", "tolerance": { "type": "ulp", "value": 2, "rationale": "Coupled microstrip Zdiff; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-zdiff", "reference": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "actual": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-zdiff-wh-eq-1", "reference": { "mode": "zdiff", "W_m": 0.0001, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.0437601569801833, "Z0_ohm": 72.57254810185282, "Zdiff_ohm": 134.93104102488513 }, "actual": { "mode": "zdiff", "W_m": 0.0001, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.0437601569801833, "Z0_ohm": 72.57254810185282, "Zdiff_ohm": 134.93104102488513 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-zdiff-narrow", "reference": { "mode": "zdiff", "W_m": 0.00005, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 2.92, "Z0_ohm": 97.6253386196932, "Zdiff_ohm": 181.5106250902856 }, "actual": { "mode": "zdiff", "W_m": 0.00005, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 2.92, "Z0_ohm": 97.6253386196932, "Zdiff_ohm": 181.5106250902856 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-zdiff-er1", "reference": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 1, "er_eff": 1, "Z0_ohm": 89.38025171272409, "Zdiff_ohm": 166.1808869345216 }, "actual": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 1, "er_eff": 1, "Z0_ohm": 89.38025171272409, "Zdiff_ohm": 166.1808869345216 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "bnd-wh-eq-1", "reference": { "mode": "zdiff", "W_m": 0.0001, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.0437601569801833, "Z0_ohm": 72.57254810185282, "Zdiff_ohm": 134.93104102488513 }, "actual": { "mode": "zdiff", "W_m": 0.0001, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.0437601569801833, "Z0_ohm": 72.57254810185282, "Zdiff_ohm": 134.93104102488513 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "boundary" }, { "id": "meta-scale-10", "reference": 1, "actual": 1, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "actual": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "error_ulp": 0 }, "follow": { "reference": { "mode": "zdiff", "W_m": 0.002, "H_m": 0.001, "S_m": 0.002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "actual": { "mode": "zdiff", "W_m": 0.002, "H_m": 0.001, "S_m": 0.002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "error_ulp": 0 }, "relation": { "reference": 1, "actual": 1, "error_ulp": 0 } } }, { "id": "meta-scale-0.1", "reference": 1, "actual": 1, "error_ulp": 0, "threshold_ulp": 2, "suite": "metamorphic", "hops": { "base": { "reference": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "actual": { "mode": "zdiff", "W_m": 0.0002, "H_m": 0.0001, "S_m": 0.0002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "error_ulp": 0 }, "follow": { "reference": { "mode": "zdiff", "W_m": 0.00002, "H_m": 0.00001, "S_m": 0.00002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "actual": { "mode": "zdiff", "W_m": 0.00002, "H_m": 0.00001, "S_m": 0.00002, "er": 4.2, "er_eff": 3.2047431568147635, "Z0_ohm": 49.928090751070556, "Zdiff_ohm": 92.82916802055753 }, "error_ulp": 0 }, "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. 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": "724df048685010f9bb2d69cb41b6fc513334539db44ec07f1bc5bccdea356a1c", "evidence_digest": "18277494742415a12f84cbef3f75f6e6703437d40a0344eda07f5d80f52149a3", "production_sha256": "d8679f20af3506f0d939fc41f759265265a940cac3effc1332876304e1ad2bc0", "attested_catalog_sha256": "dfd311ad9f2e37be7af2a29197a84f33944dff9549828dd83635a5da35985df4", "production_checks": [ { "id": "electrical.pcb.diff_impedance: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": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:evidence-sha256", "status": "pass", "detail": "df6a71b70f52", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:semantic-contract", "status": "pass", "detail": "12/12", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance: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": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.pcb.diff_impedance/1.0.0/2026-09-13.cvp-self-consistency/engineering/182774947424", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z", "projection_compared": false }, { "id": "electrical.pcb.diff_impedance:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.pcb.diff_impedance/1.0.0/2026-09-13.cvp-self-consistency/engineering/182774947424", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z", "projection_compared": false }, { "id": "electrical.pcb.diff_impedance:cvp-immutable-manifest-fetch", "status": "pass", "detail": "public=200 origin=200", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:cvp-immutable-manifest-sha256", "status": "pass", "detail": "182774947424", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:cvp-latest-alias-matches-immutable", "status": "pass", "detail": "electrical.pcb.diff_impedance/1.0.0/2026-09-13.cvp-self-consistency/engineering/182774947424", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z", "projection_compared": false }, { "id": "electrical.pcb.diff_impedance:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" }, { "id": "electrical.pcb.diff_impedance:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-12T22:29:31.481Z" } ], "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": "18277494742415a12f84cbef3f75f6e6703437d40a0344eda07f5d80f52149a3", "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": "18277494742415a12f84cbef3f75f6e6703437d40a0344eda07f5d80f52149a3", "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": "df6a71b70f52e73859eac9806010566bd58b69d94d5934e45496adcd2d1f06b4", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "dfd311ad9f2e37be7af2a29197a84f33944dff9549828dd83635a5da35985df4", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] }, "cvp_core_sha256": "18277494742415a12f84cbef3f75f6e6703437d40a0344eda07f5d80f52149a3" }, "dependencies": [ { "name": "pcb-diff-impedance-engine", "version": "1.0.0" }, { "name": "pcb-diff-impedance-reference-oracle", "version": "1.0.0" }, { "name": "electrical.pcb.microstrip", "version": "1.0.0", "role": "cross_calculator_peer", "capability_id": "electrical.pcb.microstrip", "evidence_digest": "dead067b214499d9d5d81fd85f9f7b4ae902df8e3b66b8c53692bcbbe223ac16", "evidence": "https://www.calculatorx.com/evidence/electrical.pcb.microstrip/1.0.0.cvp.json" }, { "name": "node", "version": "22.23.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "c4df4bb073bf87955dccfbc9399f558b5ac157599dcc2ffa7f03224ca402fd8f", "attested_at": "2026-09-12T22:29:31.481Z", "last_confirmed_current_at": "2026-09-13T11:35:00.166Z", "site_attestation_current": false, "capability_attestation_current": true, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-09-13T11:35:00.166Z", "live_updated_at": "2026-09-13T11:35:04.161Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-09-13T11:35:00.166Z", "site_stale_count": 2 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 2, "site_stale_capability_count": 2, "evidence_attested_at": "2026-09-12T22:29:31.481Z" }, "domain_review": { "status": "ABSENT", "spec_version": "1.0.0", "external_third_party": false }, "internal_review": { "status": "PASS", "reviewer_role": "electrical-engineer", "reviewed_by": "CalculatorX electrical review", "spec_version": "1.0.0", "independence": "internal", "external_third_party": false }, "timestamps": { "verified_at": "2026-09-12T22:29:31.481Z", "generated_at": "2026-09-12T22:29:31.481Z", "rendered_at": "2026-09-13T11:35:04.196Z", "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.pcb.diff_impedance/1.0.0.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.pcb.diff_impedance/1.0.0", "calculator": "https://www.calculatorx.com/calc/electric/pcb-diff-impedance", "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.diff_impedance/1.0.0.cvp.json", "manifest_immutable": "https://www.calculatorx.com/evidence/electrical.pcb.diff_impedance/1.0.0/2026-09-13.cvp-self-consistency.cvp.json", "manifest_core": "https://www.calculatorx.com/evidence/electrical.pcb.diff_impedance/1.0.0/2026-09-13.cvp-self-consistency.182774947424.cvp.json" } }