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The phrase "authenticated him" is correct and usable in written English.
It can be used in contexts where someone is verifying or confirming the identity or legitimacy of another person.
Example: "The security team authenticated him before granting access to the restricted area."
Alternatives: "verified his identity" or "confirmed his credentials."
Exact(2)
While Florida's 41-34 victory solidified Grossman's national reputation, Lorenzen's performance authenticated him as more than a novelty.
Mr. Smith, for instance, said that while Facebook had authenticated him as a political advertiser, he later handed over control of Sierra Nevada Revolution's account to others.
Similar(58)
With this history to authenticate him, or perhaps because he is too above it to care, Mr. Kerry does excel at showing sangfroid rather than ignorance about the cultural novelties that television often brandishes to make square politicians nervous.
In a surprising historical twist, the second photo of McCarty ever to be authenticated shows him and his posse, the Regulators, playing the sport in New Mexico in 1878.
The auction house authenticated them.
"They're authenticated," he explains.
The video, which cannot be independently authenticated, seems to show him cutting out the heart.
Despite the recent awareness and admiration of Leonardo as a scientist and inventor, for the better part of four hundred years his fame rested on his achievements as a painter and on a handful of works, either authenticated or attributed to him that have been regarded as among the masterpieces.
A photograph of Groucho presenting me with the watch or a note from him authenticating his ownership.
Goering denies any knowledge of a series of documents presented to him for identification, but does authenticate them as official government documents.
Once he authenticated the photographs, it is thought the London office wired him several thousand dollars which he is said to have paid to the National Guardsman on US soil.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com