The trading cards are a combination of 1) a URL on a server, 2) an on-blockchain pointer to the URL. Presumably Coinbase will be hosting the URLs and letting u

The trading cards are a combination of 1) a URL on a server, 2) an on-blockchain pointer to the URL. Presumably Coinbase will be hosting the URLs and letting users pay real money to create and trade those on-chain pointers. (Yes, cryptocurrency is at a point where they're trying to make you believe that buying pointers to URLs is a revolution in art and finance and mankind's freedom.)