ZRC-721 NON-FUNGIBLE TOKEN STANDARD

Introduction

What is a Non-Fungible Token?

A Non-Fungible Token (NFT) is used to identify something or someone in a unique way. This type of Token is perfect to be used on platforms that offer collectible items, access keys, lottery tickets, numbered seats for concerts and sports matches, etc. This special type of Token has amazing possibilities so it deserves a proper Standard, the ZRC-721 came to solve that!

What is ZRC-721?

The ZRC-721 introduces a standard for NFT, in other words, this type of Token is unique and can have different value than another Token from the same Smart Contract, maybe due to its age, rarity or even something else like its visual. Wait, visual?

Yes! All NFTs have a uint256 variable called tokenId, so for any ZRC-721 Contract, the pair contract address, uint256 tokenId must be globally unique. Said that a dApp can have a "converter" that uses the tokenId as input and outputs an image of something cool, like zombies, weapons, skills or amazing kitties!

PREREQUISITES

• Accounts

• Smart Contract

• TOken Standards

Body

It provides functionalities like to transfer tokens from one account to another, to get the current token balance of an account, to get the owner of a specific token and also the total supply of the token available on the network. Besides these it also has some other functionalities like to approve that an amount of token from an account can be moved by a third party account.

If a Smart Contract implements the following methods and events it can be called an ZRC-721 Non-Fungible Token Contract and, once deployed, it will be responsible to keep track of the created tokens on Ethereum.