{"$schema":"http://json-schema.org/draft-07/schema#","title":"Certificate","type":"object","additionalProperties":false,"required":["recipient","title","date"],"properties":{"kind":{"type":"string","maxLength":60,"description":"e.g. Completion, Achievement, Excellence","default":"Completion"},"recipient":{"type":"string","maxLength":120},"title":{"type":"string","maxLength":200,"description":"Course or achievement name"},"description":{"type":"string","maxLength":600},"date":{"type":"string","format":"date"},"issuer":{"type":"string","maxLength":120},"hours":{"type":"number","minimum":0},"certificateId":{"type":"string","maxLength":80},"verifyUrl":{"type":"string","maxLength":200},"signatures":{"type":"array","maxItems":3,"items":{"type":"object","required":["name"],"additionalProperties":false,"properties":{"name":{"type":"string"},"role":{"type":"string"}}}}}}