A proof of purchase is a document that serves as evidence that a customer has purchased a product or service. The crossword solutions for this term include DEED (4 letters), RECEIPT (7 letters), TITLE (5 letters), STUB (4 letters), BOXTOP (6 letters), and SALESSLIP (9 letters). A DEED is a legal document that transfers ownership of a property from one person to another. A RECEIPT is a document that serves as proof of payment for goods or services. A TITLE is a legal document that serves as evidence of ownership of a property or other asset. A STUB is a small piece of paper that serves as proof of payment for a ticket, such as a movie ticket. A boxtop is a coupon that can be cut from the top of a cereal box and used to redeem a prize. A salesslip is a document that serves as proof of a sale.