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.

To give evidence or testimony to the truth or factualness 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.”
To prove or show (something) to be true, genuine, or valid
To declare (something) to be true or genuine
“… a jeweler authenticated the diamond as real.”
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