I'd like to confirm if I could use the certification report of birth as a proof of U.S citizenship?
Yes, we can accept only certain documents as proof of U.S. citizenship. The Certification of Report of Birth DS-1350 is one of them
What other documents are accepted as proof of U.S. citizenship?
We can accept only certain documents as proof of U.S. citizenship . These include : Certification of Report of Birth DS-1350, Consular Report of Birth Abroad FS-240, U.S. passport, Certificate of Citizenship N-560/N-561, and Certificate of Naturalization N-550/N-570