Authenticated (8)

I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">authenticated</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that authenticated can be written as attested)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for attested that I've seen before include "Declared that something was true" , "Certified, vouched" , "Declared to be true or genuine" , "Claimed" , "Confirmed" .)