self-proving

adjective | \ ˈself-ˈprü-viŋ \ | self-prov·ing

1. : containing proof of its own validity a self-proving will

2. : providing or being the evidence that renders something self-proving; especially : being an affidavit signed by the witnesses to a will attesting to the will's validity : being an affidavit signed by the witnesses to a will attesting to the will's validity