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to bear witness to; certify; declare to be correct, true, or genuine; declare the truth of, in words or writing, especially affirm in an official capacity:
to attest the truth of a statement.
to give proof or evidence of; manifest:
his works attest his industry.
to put on oath.
to testify or bear witness (often followed by to):
to attest to the reliability of an employee.
archaic. witness; testimony; .
historical examples

and yet there it was, and, by the slip of paper fastened to it, attesting a special notice.
davenport dunn, volume 2 (of 2) charles james lever

you say that you have a paper, signed by jacob morton, attesting your ident-ty.
tom, the bootblack horatio alger

believe the evidence we cannot, yet we cannot doubt the good faith, the veracity of the attesting witnesses.
c-ck lane and common-sense andrew lang

define and describe signing, attesting, and acknowledging a will.
cyclopedia of commerce, accountancy, business administration, v. 3 various

i wrote also to the chief of our order, giving account of the whole matter, and attesting the innocence of galli the scribe.
the three perils of man, vol. 2 (of 3) james hogg

know, then, that i have a copy of the genuine will, and the means of attesting it!
hatchie, the guardian slave; or, the heiress of bellevue warren t. ashton

it is soul-travail like his, attesting love like his; that wins all the victories in which he can rejoice.
expositor’s bible: the second epistle to the corinthians james denney

for instance—were you not taken before an attesting magistrate?
punch, or the london charivari, vol. 102, april 30, 1892 various

in attesting mr. steele’s faith in his judgment and his friend, it will serve its author’s main and best ambition.
the collected works of ambrose bierce, vol. ii: in the midst of life: tales of soldiers and civilians ambrose bierce

his new one was attesting its truth grandly; never had g-d’s help been more manifest to him than this morning.
joshua, complete georg ebers

verb
(transitive) to affirm the correctness or truth of
when intr, usually foll by to. to witness (an act, event, etc) or bear witness to (an act, event, etc) as by signature or oath
(transitive) to make evident; demonstrate: his life of luxury attests his wealth
(transitive) to provide evidence for: the marks in the ground attested the presence of a fossil
v.

1590s, from middle french attester (old french atester, 13c.) “affirm, attest,” from latin attestari “confirm,” literally “bear witness to,” from ad- “to” (see ad-) + testari “bear witness,” from testis “witness” (see testament). related: attested; attesting.