certifiable
certificated
credentialled
insane
registered
accepted
acknowledged
actual
admitted
affirmed
alleged
allowed
announced
approved
ascertained
asserted
asseverated
assured
attested
authenticated
averred
avouched
avowed
borne out
categorically true
certain
circumstantiated
conceded
confessed
confirmed
corroborated
countersigned
covered
decided
declared
demonstrated
deposed
determinate
determined
documentary
effectual
endorsed
ensured
enunciated
established
factual
fixed
granted
guaranteed
historical
in the bag
insured
made sure
manifestoed
nailed down
decertified