how-to-create-evt.md

How to create EVT

Guide

1. import package

import EVT lib by copy lib/contracts/EVT

TODO: change this to @evt/evt-lib

import "@openzeppelin/contracts/access/Ownable.sol";
import "./../EVT/EVT.sol";

contract Example is EVT, Ownable {
}

2. add data type (optional)

Add the type you need in your contract, such as:

enum Types {Bool, Int256, Uint256, Bytes32, Address, Bytes, String, NewtonAddress}

Then, add the type function, for Bool is as follow:

function setBoolDynamicProperty(uint256 tokenId, string memory propertyName, bool propertyValue) external payable;
function getBoolDynamicProperty(uint256 tokenId, string memory propertyName) external view returns (bool propertyValue);

refer lib/contracts/EVT/EVTExample.sol

3. define your own tokenURI

There are many ways to customize your tokenURI, here are some of the common ones：

3.1. Base64

import "Base64.sol" and custom your tokenURI, just like the tokenURI in lib/contracts/EVT/EVTExample.sol

3.2. updateTokenURI

the tokenURI is just uri or ipfs, and the owner can update it. just like the SecureMovie.

3.3. refer other token

This tokenURI references the tokenURI of another contract, just like the SecureMovieTickets