What makes testimony trustworthy? Based on fieldwork at a Holocaust museum, we argue that testimonies are trustworthy that because they make implicit and explicit truth claims. We argue that confidence is formed by interdependent institutions that vouch for these claims, as well as institutions that produce other cultural objects with comparable meaning, such as museums and films. These claims of truth exist in the testimony act in itself, as well as in explicit claims of truth made by the testifiers. Holocaust testimonies make explicit truth claims through assertions of institutionally legitimated information, personal experiences, and societal remembrance. After considering the creation of trust in testimony, we discuss how it can be generalized to the courtroom.