How can I access my card’s asset backed NFT, which we refer to as a DPOC (Digital Proof of Claim)?

You can access the DPOC by following these steps.  Go to the card detail page of your card.  Click the "View on Polygon" button on the top right corner of the transaction history table. When you click "View on Polygon," you will be directed to PolygonScan, where you can view the transaction history and the details of the DPOC, which mirrors the transaction history of card ownership in the vault.