Incontrovertible evidence

Incontrovertible evidence and conclusive evidence (less formally, concrete evidence and hard evidence) are colloquial terms for evidence introduced to prove a fact that is supposed to be so conclusive that there can be no other truth to the matter; i.e., evidence so strong it overpowers contrary evidence, directing a fact-finder to a specific and certain conclusion. A "conclusive evidence" clause may be included in a contract or deed of guarantee, having the effect of showing that, in the absence of manifest error, the guarantor is liable to deliver on their guarantee when their obligation is triggered.

Source: Wikipedia — Incontrovertible evidence (CC BY-SA 4.0)