プロダクト概要

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract DigitalMarket is ERC721, Ownable {
  uint256 private nextTokenId;
  uint256 public tokenPrice;

  event AssetMinted(address indexed owner, uint256 tokenId, uint256 price);
  event AssetListed(uint256 indexed tokenId, uint256 price);
  event AssetSold(address indexed buyer, address indexed seller, uint256 tokenId, uint256 price);
  constructor(string memory name, string memory symbol, uint256 _tokenPrice) ERC721(name, symbol) {

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract BankingAndDigitalCurrency {
  address public owner;
  IERC20 public stablecoin;

  event Transfer(address indexed from, address indexed to, uint256 amount);
  modifier onlyOwner() {
    require(msg.sender == owner, "Not the owner");
    _;
  }

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC725/ERC725.sol";
import "@openzeppelin/contracts/token/ERC735/ERC735.sol";

contract IdentityContract is ERC725, ERC735 {
  constructor() ERC725("IdentityContract") {}
  function addKey (
    address _key,
    uint256 _purpose,
    uint256 _keyType
  ) public override onlyManagement returns (bool success) {
    return super.addKey(_key, _purpose, _keyType);

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MoneyAndDigitalAssetsContract is ERC20, ERC721, Ownable {
  uint256 private nextTokenId;

  event DigitalAssetMinted(address indexed owner, uint256 tokenId);
  event DigitalAssetTransferred(address indexed from, address indexed to, uint256 tokenId);

  constructor(string memory moneyName, string memory moneySymbol, string memory assetName, string memory assetSymbol)