Synonyms for Documented (same or very similar meaning)
WordNet sense 1 (established as genuine):
attested, authenticatedWordNet sense 2 (not fake or counterfeit):
echt, genuineWordNet sense 3 (officially documented):
certificated, credentialedWordNet sense 4 (endorsed authoritatively as having met certain requirements):
certifiedFrom the ODE community, based on WordNetadd/edit