COA.LTD (certificate of authentication limited) is an app that allows brands and creators to serialize the physical collections they issue making them able to be registered on the blockchain. The idea coincidentally surfaced around the same time as the ERC 6551 Token Bound Accounts and proposes a similar concept in which the product 'conceptually' has a wallet (we call them pockets) to receive rewards/airdrops/goodies and offers creating a dynamic secondary market.