{"$schema":"https://json-schema.org/draft/2020-12/schema","$id":"https://altss.com/schemas/evidence.json","title":"Altss result evidence","description":"A permitted source supporting a named result field. A concise supporting note is evidence, not hidden reasoning. Missing dates remain null.","type":"object","additionalProperties":false,"required":["field","source_url","source_type","published_at","captured_at","observed_at","verified_at","basis"],"properties":{"field":{"type":"string","description":"Result field path supported by this evidence."},"source_url":{"type":["string","null"],"format":"uri"},"source_type":{"enum":["official_website","filing","public_reporting","licensed_source","organization_submission","customer_provided",null]},"published_at":{"type":["string","null"],"format":"date-time","description":"Recorded timestamp only. Null when unknown or unavailable; never substitute page modification time."},"captured_at":{"type":["string","null"],"format":"date-time","description":"Recorded timestamp only. Null when unknown or unavailable; never substitute page modification time."},"observed_at":{"type":["string","null"],"format":"date-time","description":"Recorded timestamp only. Null when unknown or unavailable; never substitute page modification time."},"verified_at":{"type":["string","null"],"format":"date-time","description":"Recorded timestamp only. Null when unknown or unavailable; never substitute page modification time."},"basis":{"type":"string","description":"Short factual support or limitation; no chain-of-thought."}}}