{ "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": "fspl", "version": "1.0.0", "title": "Free-Space Path Loss Calculator", "formula_family": "fspl-log10", "capability_id": "electrical.rf.fspl" }, "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": "fspl", "version": "1.0.0", "uri": "https://www.calculatorx.com/evidence/electrical.rf.fspl/1.0.0.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": "Friis transmission equation", "kind": "other", "reference": "Free-space path loss form" }, { "label": "ITU-R P.525-5 (11/2024), Calculation of free-space attenuation", "kind": "standard", "reference": "Free-space basic transmission loss" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "ITU / Friis free-space path loss identity" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module FSPL oracle — same V8 binary64 as IUT", "engine": { "name": "fspl-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP fspl_dB comparison vs IUT", "engine": { "name": "fspl-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": "FSPL_dB = 20·log10(d_m) + 20·log10(f_Hz) + 20·log10(4π/c)" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Free-space isotropic model; path_loss_dB is antenna-adjusted link loss (FSPL − Gt − Gr)" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "API SI: metres + Hz; gains dBi. Display units are presentation-only when d_m/f_Hz are present." }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "2/2 legacy golden; 2/2 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 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": "3/3 declared partitions (isotropic, with-gains, invalid-domain) · 2 legacy golden / 4 CVP boundary unique cases · 3 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 fspl; 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 @ 2026-09-13T11:35:01.909Z (9 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 (9 capabilities; 147 remain CURRENT) @ 2026-09-13T11:35:01.909Z · 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 · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=d8679f20af3506f0d939fc41f759265265a940cac3effc1332876304e1ad2bc0 · verified_at=2026-09-13T01:42:22.552Z · evidence_attested_at=2026-09-13T01:42:22.552Z · last_confirmed_current_at=2026-09-13T11:35:00.166Z · rendered_at=2026-09-13T11:35:03.136Z · binds=cvp_core_sha256", "check_result": "PASS", "production_state": "CURRENT", "binding_current": true }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Loss in dB; wavelength metres" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "4/4 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-UI-01: canonical SI is the only calculation source. Mixed share URLs (d_m + fsplDInput without fsplDUnit) must still yield FSPL. Live Chromium session is npm run test:fspl-live-e2e — not executed inside this SSR/REST/MCP probe." }, "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": 2, "total": 2, "failed": 0, "case_ids": [ "g-iso", "g-gains" ] }, "boundary": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "missing-f", "zero-d", "nan-d", "boundary-1km-2g4" ] }, "invalid": { "passed": 3, "total": 3, "failed": 0, "case_ids": [ "missing-f", "zero-d", "nan-d" ] }, "property": { "passed": 4, "total": 4, "failed": 0, "case_ids": [ "property-fspl", "property-6db", "property-freq", "property-gains" ], "kind": "fixed" }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "contract": { "passed": 4, "total": 4, "failed": 0 }, "cross_interface": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "iface-iso", "iface-mixed-missing-d-unit" ] } }, "coverage": { "partitions": [ { "id": "isotropic", "description": "Zero / omitted gains", "exercised": true, "case_count": 3 }, { "id": "with-gains", "description": "Non-zero antenna gains", "exercised": true, "case_count": 2 }, { "id": "invalid-domain", "description": "Invalid inputs", "exercised": true, "case_count": 3 } ] }, "numerical": { "representation": "IEEE-754 binary64", "tolerance": { "type": "ulp", "value": 2, "rationale": "log10 FSPL; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-iso", "reference": { "fspl_dB": 100.05200805611548, "path_loss_dB": 100.05200805611548, "wavelength_m": 0.12491352416666666, "d_m": 1000, "f_Hz": 2400000000, "Gt_dBi": 0, "Gr_dBi": 0 }, "actual": { "fspl_dB": 100.05200805611548, "path_loss_dB": 100.05200805611548, "wavelength_m": 0.12491352416666666, "d_m": 1000, "f_Hz": 2400000000, "Gt_dBi": 0, "Gr_dBi": 0 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-gains", "reference": { "fspl_dB": 100.05200805611548, "path_loss_dB": 88.05200805611548, "wavelength_m": 0.12491352416666666, "d_m": 1000, "f_Hz": 2400000000, "Gt_dBi": 6, "Gr_dBi": 6 }, "actual": { "fspl_dB": 100.05200805611548, "path_loss_dB": 88.05200805611548, "wavelength_m": 0.12491352416666666, "d_m": 1000, "f_Hz": 2400000000, "Gt_dBi": 6, "Gr_dBi": 6 }, "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. CVP-UI-01: canonical SI is the only calculation source. Mixed share URLs (d_m + fsplDInput without fsplDUnit) must still yield FSPL. Live Chromium session is npm run test:fspl-live-e2e — not executed inside this SSR/REST/MCP probe." }, "artifacts": { "evidence_bundle_sha256": "6be9db9b8f5a7b5654bd9e2606f42319a6c68262b183d4d555db968306b17450", "evidence_digest": "486d3a52cd93ca3165618bb5db4bd4d8c64ea2b3dcfa858e89b86cbcf5ef8cdd", "production_sha256": "d8679f20af3506f0d939fc41f759265265a940cac3effc1332876304e1ad2bc0", "attested_catalog_sha256": "dfd311ad9f2e37be7af2a29197a84f33944dff9549828dd83635a5da35985df4", "production_checks": [ { "id": "electrical.rf.fspl: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": "2026-09-13T01:42:22.552Z" }, { "id": "electrical.rf.fspl:evidence-sha256", "status": "pass", "detail": "b73d10b5564f", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z" }, { "id": "electrical.rf.fspl:semantic-contract", "status": "pass", "detail": "10/10", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z" }, { "id": "electrical.rf.fspl: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": "2026-09-13T01:42:22.552Z" }, { "id": "electrical.rf.fspl:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.rf.fspl/1.0.0/-/engineering/486d3a52cd93", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z", "projection_compared": false }, { "id": "electrical.rf.fspl:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.rf.fspl/1.0.0/-/engineering/486d3a52cd93", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z", "projection_compared": false }, { "id": "electrical.rf.fspl:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z" }, { "id": "electrical.rf.fspl:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-13T01:42:22.552Z" } ], "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": "486d3a52cd93ca3165618bb5db4bd4d8c64ea2b3dcfa858e89b86cbcf5ef8cdd", "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": "486d3a52cd93ca3165618bb5db4bd4d8c64ea2b3dcfa858e89b86cbcf5ef8cdd", "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": "b73d10b5564f4c8890bb4f20f785a8c35a873cffb5c793cf9329d4cabb7152fe", "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": "486d3a52cd93ca3165618bb5db4bd4d8c64ea2b3dcfa858e89b86cbcf5ef8cdd" }, "dependencies": [ { "name": "fspl-engine", "version": "1.0.0" }, { "name": "fspl-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "22.23.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "c4df4bb073bf87955dccfbc9399f558b5ac157599dcc2ffa7f03224ca402fd8f", "attested_at": "2026-09-13T01:42:22.552Z", "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": "2026-09-13T11:35:01.909Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-09-13T11:35:00.166Z", "site_stale_count": 9 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 9, "site_stale_capability_count": 9, "evidence_attested_at": "2026-09-13T01:42:22.552Z" }, "domain_review": { "status": "PASS", "spec_version": "1.0.0", "external_third_party": false, "reviewer_role": "electrical-engineer", "independence": "internal" }, "timestamps": { "verified_at": "2026-09-13T01:42:22.552Z", "generated_at": "2026-09-13T01:42:22.552Z", "rendered_at": "2026-09-13T11:35:03.136Z", "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.rf.fspl/1.0.0.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.rf.fspl/1.0.0", "calculator": "https://www.calculatorx.com/calc/electric/fspl", "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.rf.fspl/1.0.0.cvp.json" } }