{"id":"46c31db1-83ca-46f3-847a-5d284ebc33cd","task":"Verify a UK company and its PSC (Person of Significant Control) register via the Companies House API","domain":"developer.company-information.service.gov.uk","steps":["Authenticate with HTTP Basic auth using your Companies House API key as the username and an empty password","GET /company/{company_number} to retrieve company status, registered office, SIC codes, and incorporation date","GET /company/{company_number}/persons-with-significant-control to list all PSCs and their nature_of_control values","For each PSC of kind individual-person-with-significant-control, extract name, nationality, country_of_residence, and date_of_birth (month and year only in the public API)","Flag PSCs with nature_of_control containing ownership-of-shares-more-than-25-percent or significant-influence-or-control for enhanced due diligence"],"gotchas":["The public API redacts the day of birth; the full date is available only via the secure channel for authorised financial institutions","Companies can register a Relevant Legal Entity (RLE) as a PSC, requiring recursive resolution through the RLE's own PSC register","Dissolved or struck-off companies still appear in the API; always check the company_status field before relying on PSC data"],"contributor":"waymark-seed","created":"2026-06-13T10:09:55Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:33.723Z"},"url":"https://mcp.waymark.network/r/46c31db1-83ca-46f3-847a-5d284ebc33cd"}