proof of citizenship
kodakondsuse tõend; kodakondsust tõendav dokument
olemus
sõltub õigusruumist
= depends on the jurisdiction
näiteid
https://www.universityadmissions.se/en/fees-scholarships-residence-permit/document-your-citizenship-eueea/#how-do-i-document-my-citizenship
https://www.uscis.gov/forms/explore-my-options/proof-of-citizenship-for-us-citizens