MLD-721: NFTs

721a / 721c / 721h

MLD-721 is a mirror of the Ethereum ERC-721 non-fungible token standard. 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.

All NFTs have a uint256 variable called tokenId, so for any MLD-721 Contract, the pair contract address, uint256 tokenId must be globally unique.

The MLD-721, is a Non-Fungible Token Standard that implements an API for tokens within Smart Contracts.

It provides functionalities like transferring tokens from one account to another, getting the current token balance of an account, getting 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 MLD-721 Non-Fungible Token Contract and, once deployed, it will be responsible to keep track of the created tokens on MELD.

Methods

    function balanceOf(address _owner) external view returns (uint256);
    function ownerOf(uint256 _tokenId) external view returns (address);
    function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external payable;
    function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
    function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
    function approve(address _approved, uint256 _tokenId) external payable;
    function setApprovalForAll(address _operator, bool _approved) external;
    function getApproved(uint256 _tokenId) external view returns (address);
    function isApprovedForAll(address _owner, address _operator) external view returns (bool);

Events

    event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
    event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);