What is another word for authenticate?

Need synonyms for authenticate? Here's a list of similar words from our thesaurus that you can use instead.

Verb
To demonstrate or support the truth or value of
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“The lawyer says his client has started compiling documents that he says will authenticate her life story as she tells it in the book.”
Verb
To prove or show (something) to be true, genuine, or valid
Verb
To affirm or assert the veracity of something
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