The phrase "attest none" is not standard or commonly used in written English.
It could be used in a context where someone is stating that they do not confirm or verify anything.
Example: "In my report, I can only present the facts, and I must attest none of the claims made by the witnesses."
Alternatives: "confirm nothing" or "verify none".
Although markings had been found on earlier objects such as animal bones and blocks of ochre, none attested to group adaptation of an artistic canon.
As graduate alumni I've met throughout the world attest, Berkeley ranks second to none in its breadth, depth, and reach of scholarship, research, and public service — in its impact in California, the U.S., and around the globe.
Yes, true, there are millions of dogs who are just as cute (their owners will attest to that!)... but none cuter.
The number of variations and modifications of the blind bedside technique attest to the fact that none is ideal.
Rupert is, as none other than Tony Randall attests, "destined for greatness, in one way or another".
All of these publications attested to his painstaking diligence, but none more so than the Oxford Dictionary of Music (1985), on the second edition of which he worked with Joyce Bourne, his second wife.
As Pointless fans will attest, however, celebrities are useless at quizzes – none of the luminaries get the Reg Varney question, an old pub quiz chestnut.
We've noted that most drug apprehensions occur at existing ports of entry, a fact attested to in testimony in 2017 by none other than Nielsen's predecessor and Trump's former chief of staff, John F. Kelly.
Dimitri Kolesnikov attests to the hopelessness aboard the sunken Russian submarine (" 'None of Us Can Get Out,' Kursk Sailor Wrote," front page, Oct. 27).
It's not their first time working together, as fans of their None of Dem collaboration on Robyn's Body Talk will attest to, and swings from euphoric electropop to 10-minute washes of synths.
