attest

verb6

1. •
   To affirm to be correct, true, or genuine.

   • When will the appraiser attest the date of the painting?
2. •
   To supply or be evidence of.

   • Her fine work attested her ability.
3. •
   To certify by signature or oath.

   • You must attest your will in order for it to be valid.
4. •
   To certify in an official capacity.
5. •
   To put under oath.
6. •
   (no longer used) To call to witness; to invoke.

   • The sacred streams which Heaven's imperial state / Attests in oaths, and fears to violate. — 1697