attested (adj.)

• actual
• alleged
• announced
• ascertained
• asserted
• assured
• authenticated
• avowed
• certain
• certified
• confirmed
• corroborated
• decided
• declared
• demonstrated
• determinate
• determined
• documentary
• effectual
• established
• factual
• fixed
• guaranteed
• historical
• open-and-shut
• pledged
• professed
• pronounced
• proved
• proven
• real
• secure
• set
• settled
• stated
• substantiated
• sure-enough
• sworn
• tested
• tried
• true
• truthful
• unquestionable
• validated
• veracious
• verified
• veritable
• vowed
• warranted