verb group
authenticate, affirm to be true, genuine, or correct, as in an official capacity
"I attest this signature"
verb group
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
"His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness"
is a type of (narrower)
give evidence of, as of records
"The diary shows his distress that evening"