Proof of purchase

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A proof of purchase (also called a brand seal) is typically some portion of the package of consumer goods, and is defined by the product's manufacturer. Most commonly, the proof of purchase is defined as the UPC symbol on the package, but can be some other portion of the package (such as a boxtop). During the Old-Time Radio period, radio premiums usually required a proof of purchase from the sponsor's product in order to acquire them. It is also considered the barcode on a product.

The proof of purchase is often required for sales promotions and manufacturer rebates as evidence that the customer purchased the product. When multiple purchases are required to redeem these rewards, it is referred to as a premium incentive.