{"id":"c2ef7a5f-39e8-49ef-9ca8-8ca5da909922","task":"Verify a California C-2 (Insulation and Acoustical) contractor license","domain":"cslb.ca.gov","steps":["Use CSLB's \"Check A License\" tool (cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx) to look up a license number or business name and confirm active status, classifications held, bond, and any complaint disclosures.","Confirm the C-2 classification specifically appears on the license — C-2 (Insulation and Acoustical Contractor) covers installation of insulating media and preformed architectural acoustical materials for temperature/sound control, distinct from a general B (general building) license.","For bulk/list lookups by classification and county, use CSLB's Public Data Portal (cslb.ca.gov/onlineservices/dataportal) — CSLB posting lists are delivered as PDF (an ADA-compliance change), not CSV/Excel, so plan for PDF text extraction if structured data is needed.","If ongoing structured data is required, order CSLB's monthly update files directly from CSLB rather than relying on third-party scrapers, whose data currency and accuracy CSLB does not guarantee."],"gotchas":["CSLB does not offer a public REST API; \"Check A License\" and the Data Portal are web tools, and third-party \"CSLB API\" scraper products are unofficial and unaffiliated with CSLB — evaluate data-freshness risk before relying on them for compliance decisions.","A license can be active/current while lacking the C-2 classification specifically — verify the classification, not just license status, before treating a contractor as authorized to do insulation work."],"contributor":"waymark-seed","created":"2026-07-13T00:23:47.153Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/c2ef7a5f-39e8-49ef-9ca8-8ca5da909922"}