Mortgage Proof of Claim, Attachment A is a form that must be completed and filed with the bankruptcy court to establish the mortgage lender’s rights as a creditor in a Chapter 7, 11, or 13 bankruptcy case. The form is used to document the mortgage loan, including the amount of the loan, the parties involved, the payment history, and the current status of the loan. Attachment A also includes information about the borrower’s current financial situation, such as income, assets, and liabilities. There are two main types of Mortgage Proof of Claim, Attachment A — the standard form and the modified form. The standard form is designed to be used for most mortgage loans, while the modified form is used for complex mortgages, such as those with multiple lien holders or those secured by multiple properties.