Each card in the Arena Club vault is tied to a unique DPOC (digital proof of claim) on the blockchain and is viewable in its owner's showroom on the card detail page. The DPOC owner is effectively the owner of the card. As our Terms of Service state, Arena Club does not take ownership of cards being custodied in the vault. The owner is whoever owns the DPOC in their showroom. If you ever want your physical cards back, simply log in and go to Retrieve Cards from the showroom. We will return your cards within 4-10 business days.