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The phrase "a letter of authentication" is correct and usable in written English.
It can be used when referring to a document that verifies the authenticity of something, such as a signature, identity, or product.
Example: "Please provide a letter of authentication to confirm the legitimacy of the documents submitted."
Alternatives: "certificate of authenticity" or "verification letter."
Exact(1)
Each decanter comes with a letter of authentication signed by Andrew Burne, according to the company, one of England's foremost experts on early English and Irish glass.
Similar(59)
In the letter of authentication that accompanies the watch, Ms. Starriet, who has died, writes that she cherished the watch and a letter from Dean that began with "To Mom".
(Biden had written a letter of recommendation).
It was a letter of consequence.
State Assemblyman Kieran Michael Lalor wrote a letter of protest.
Draft a Letter of Intent.
Request a letter of recommendation.
Send a letter of inquiry.
Write a letter of intent.
Write a letter of commendation.
Write a letter of apology.
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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