ERC-721.sol

pragma solidity ^0.5.7;

interface ERC721 is ERC165 {
  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);

  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);
}

interface ERC165 {
  function supportsInterface(bytes4 interfaceID) external view returns (bool);
}