authenticate, affirm to be true, genuine, or correct, as in an official capacity; "I attest this signature"公的権力のもとで、真性であるとし、本物、真実または正確であると確証する認証
例:I attest this signature. 私はこの署名を証明する。
give testimony in a court of law法廷で証言をする証言
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"証拠を提出する証明