The rising significance of Holocaust commemoration has advanced provenance research of Nazi-looted material Jewish heritage and has shown the urgent need for reliable resources in order to cope with the particular challenges of identifying Judaica objects. This review essay examines the theoretical foundations of provenance research in Germany and presents two indispensalbe resources that help with practical provenance research. The Lost Art Database, maintained by the Lost Art Foundation, documents cultural assets beeing illegaly confiscated by the Nazis. The Handbook on Judaica Provenance Research: Ceremonial Object, an open access electronic publication, funded by Claims Conference and the World Jewish Restitution Organization (WJRO), pr...