Proof of debt
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The formal establishment by a creditor of his debt or claim, in some prescribed manner. (as, by his affidavit or otherwise,) as a preliminary to its allowance, along with others, against an estate or property to be divided, such as the estate of a bankrupt or insolvent, a deceased person, or a firm or company in liquidation.