corroboration

something presented in support of the truth or accuracy of a claim that's a serious charge, so you certainly should have corroboration for it Synonyms attestation, confirmation, proof, documentation, evidence, substantiation, testament, testimonial, testimony, validation, voucher, witnessRelated Words (the) goods; certificate, document, exhibit; demonstration, illustration; authentication, identification, manifestation, verificationNear Antonyms rebuttal, refutation; accusation, allegation, charge; assumption, conjecture, guess, presumption, surmise, suspicionAntonyms disproof