When reading, context clues is a technique very useful to infer the meaning of an unknown word by only looking at the surrounding information of that unfamiliar word. In the given sentence, the type of context clue that helps us identify the meaning of "verify" is a restatement, since after "verify", the speaker provides a subsequent statement or synonym of that word: "confirm". And "to confirm" means to assure, or verify, the truth or accuracy of something.
