ERC721 and ERC721Enumerable
Learn about the non-fungible token (NFT) standard.
We'll cover the following...
Tokens and fungibility
A token is an on-chain representation of something valuable (experience points in a game, currency, voting rights, digital assets, identity, credentials, and so on).
There are two types of tokens: fungible and non-fungible tokens (NFT).
Fungible assets are indistinct and interchangeable. Like US dollars, only their amount matters. It doesn’t matter which particular $1 banknote we own; they all have the same value. What matter is how much we own. Non-fungible assets are distinct and unique, like Rembrandts; which particular artwork we own does matter—some are more valuable than others.
That said, both are valuable assets, so we care about securely proving their authenticity and ownership. For tokens, this is managed by a token contract, which maps tokens with the address of their owners and provides other utilities.
In blockchain games, tokens can be used to manage different aspects of the player experience.
Access: Ownership of a certain NFT or payment of a certain number of fungible tokens can act as a toll to access the game.
Identity: An NFT can represent the player's identity and their in-game character. ...