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ERC-721

Previous3. Interacting with ERC-20 token from Klaytn WalletNext1. Writing ERC-721 Smart Contract

Last updated 2 years ago

Introduction

This tutorial helps you to create an example ERC-721 compatible token that conforms to , especially .

defines three events and 10 methods as below. supportsInterface of ERC-721 is derived from and ERC-165 is a part of ERC-721. ERC-721 compatible tokens are the token contracts that implement ERC-721 and ERC-165 interfaces as below.

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);

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);
function supportsInterface(bytes4 interfaceID) external view returns (bool);

Based on above interface, developers may customize tokens by adding new features and logics, and deploy on Klaytn network. For more information, refer to official .

In this tutorial, you are going to implement MyERC721Card.sol which implements a card-type non-fungible token, i.e. MyERC721Card, which is an ERC-721 token. Each MyERC721Card has name and level, e.g. "King" with level 1, "Queen" with level 1.

The rest of this tutorial is organized as follows.

    • 1.1 Overall structure of MyERC721Card code with whole MyERC721Card code

    • 1.2 Take a look at important functions

    • 2.1 Deploying smart contract using Remix Online IDE

    • 2.2 Deploying smart contract using truffle

MyERC721Card.sol is based on OpenZeppelin's ERC721 implementation. A major part of the code in this tutorial is forked from .

OpenZeppelin 2.3
1. Writing ERC-721 smart contract
2. Deploying smart contract
Klaytn Token Standards
ERC-721 Non-Fungible Token Standard
ERC-165 Standard Interface Detection
ERC-721 specification
Non-fungible Token Standard (ERC-721)