How did evidentiary documents record legal acts?

In the study of diplomatics, evidentiary documents serve as written records of legal acts that have already been performed orally. Unlike dispositive documents, where the act of issuing the document itself constitutes the legal enactment, evidentiary documents function strictly as proof of a prior transaction.1

To ensure their validity and evidentiary value, these documents were typically structured into three parts:
* Protocol: Included the invocation of God, the sender's title, and the address.2
* Context: Contained the motive (arenga), the notification of the legal purpose, the exposition of circumstances (narratio), and the core decree of enactment (dispositio).2
* Final Protocol: Included subscriptions, witness lists, the date and place of issue, and validation signs such as seals or monograms.2

To provide further security, methods like the Anglo-Saxon chirography were used to produce multiple "originals" that could be verified by reassembling cut pieces of vellum. Additionally, copies could be formally certified by public notaries or high-ranking officials to grant them the same legal weight as the original document.3