authenticates

/AO0 TH EH1 N T AH0 K EY0 T S/
verb
  1. 1

    To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit.

  2. 2

    To prove authentic; to determine as real and true.

    โ€œHe didn't manage to authenticate the portrait: it's probably a fake.โ€

Source: https://en.wiktionary.org/wiki/authenticate, https://en.wiktionary.org/wiki/authenticates