verifying

/V EH1 R AH0 F AY0 IH0 NG/
verb
  1. 1

    To substantiate or prove the truth of something

  2. 2

    To confirm or test the truth or accuracy of something

  3. 3

    To affirm something formally, under oath

Source: https://en.wiktionary.org/wiki/verify, https://en.wiktionary.org/wiki/verifying