Artificial intelligent assistant

attester

attester, -or
  (əˈtɛstə(r), -ɔː(r))
  [f. as prec. + -er1, -or.]
  One who attests, bears witness, or vouches for.

1598 Florio, Testatrice, a woman witnes, or attester. 1663 J. Spencer Prodigies (1665) 226 Suspicion of deceit of sight or imagination in the Attestors. 1705 Stanhope Paraphr. II. 607 Credible Attesters of it to Others. 1836 T. Davies in Brit. Annual 322 The mode of attesting an agreement, where the attestor could not write his name.

Oxford English Dictionary

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