Wisconsin Proof of Claim, Supplement 1 is an official form that is used to file a proof of claim for a debtor's assets in a bankruptcy case in Wisconsin. The form includes information such as the name of the debtor, the case number, the creditor's name, the amount of the claim, and the type of claim. There are two types of Wisconsin Proof of Claim, Supplement 1: one for unsecured claims and one for secured claims. The form must be completed and filed with the bankruptcy court in order to be eligible to receive payment from the debtor's assets.