verify

To substantiate or prove the truth of something.transitive

• "It is early to judge," he remarked, after stopping the car in order to verify the name on the brass plate, "but, upon my word, Max, I really think that our ghost might have discovered more appropriate quarters."

To confirm or test the truth or accuracy of something.transitive

• In comparison, it takes about a minute to save, rewind and manually verify a similar file on a cassette.

To affirm something formally, under oath.transitive