How did Pope Innocent III try to identify fraudulent papal documents?

In the context of diplomatics, Pope Innocent III (reigned 1198–1216) attempted to establish infallible criteria to identify fraudulent papal documents.1

However, his efforts were significantly hindered because the contemporary knowledge of earlier documentary forms was totally inadequate for such a task. While Innocent III sought to formalize the detection of forgeries, serious critical methods for verifying documents did not emerge until the 17th century, when scholars like Jean Mabillon developed the fundamental principles of the science of diplomatics.12

During his pontificate, Innocent III did reform the papal chancery, and it was under his leadership that the papacy began maintaining an almost uninterrupted series of registers of outgoing documents. These registers became essential tools for later scholars to verify the authenticity of papal records by comparing them against established administrative precedents.342