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This example DApp is using a Non Fungible Token smart contract (NFT) to manage cards ownership.
Conversely to fungible token, a non-fungible token represents a unique asset and cannot be combined to another token.
In a nutshell it specifies that a NFT has the following entry points:
update_operatorsis used to authorize third party to transfer tokens
transferis used to actually transfer ownership
balance_ofis used to retrieve ownership information
Inspect the smart contract transactions in Better Call Dev: