A more thorough explanation:

Definition: A constat is a certificate that confirms the information recorded in the Court of Exchequer. It is made by the Clerk of the Pipe and the auditors of the Exchequer at the request of a person who wants to plead for the discharge of some item. The constat certifies what appears on record.

Example: John wants to plead in the Court of Exchequer to discharge a debt. He requests a constat from the Clerk of the Pipe and the auditors of the Exchequer. The constat confirms the amount of the debt and other relevant information recorded in the court.

Explanation: The example illustrates how a constat is used to confirm the information recorded in the Court of Exchequer. John needs a constat to prove the amount of the debt he wants to discharge. The constat certifies what appears on record, which means it confirms the accuracy of the information in the court's records.