Canary tracing for one business (?domain=). The licence holder or owner sees every canary - a harmless variant of the business's own name or street (legal-form punctuation, street-type or direction spelling) given to ONE supplier - with where and when it was seen and the proven feed paths (supplier -> directory, with lag in days); public callers get counts only. Sightings are found by the daily listing monitor and also arrive in /api/v1/changes (section listings, kind canary_seen). Signed (crawlcheck-business-canaries).