the act of verifying.

the state of being verified.

evidence that establishes or confirms the accuracy or truth of something

We could find no verification for his fantastic claims.

a formal assertion of the truth of something, as by oath or affidavit.

the process of research, examination, etc., required to prove or establish authenticity or validity.

Law . a short confirmatory affidavit at the end of a pleading or petition.

noun

affidavit , attestation , authentication , averment , certification , confirmation , credentials , deposition , documents , endorsement , evidence , facts , information , record , scoop * , seal , signature , stamp , substantiation , testament , testimony , corroboration , demonstration , proof , testimonial , validation , warrant , affirmation