attest

To affirm to be correct, true, or genuine.

When will the appraiser attest the date of the painting?

Dishonour not your Mothers: now attest that those whom you call'd Fathers, did beget you.

To certify by signature or oath.

You must attest your will in order for it to be valid.

To certify in an official capacity.

To supply or be evidence of.

Her fine work attested her ability.

O pardon : since a crooked Figure may / Attest in little place a Million, / And let us, Cyphers to this great Accompt, / On your imaginarie Forces worke.

To put under oath.