authenticator

authenticate +‎ -or

authenticator (plural authenticators)

1. (agent noun) One who, or something which, authenticates, as:
   1. An app that uses applied cryptography to prove someone's identity to a network connection.
   2. A feature that shows something to be authentic.
   3. (film, television) A person employed to check the accuracy and realism of a script.
   • 2004, N. Kathryn Howard, The Stripper Diaries: A Novel about Passion, page 217:

     I did secure a position as a technical advisor and script authenticator on my HBO series, despite the fact that producers didn't think I was qualified for any position.

• identifier (an identifier asserts identity; an authenticator verifies it)