ERC721.sol

pragma solidity ^0.4.20;


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

 interface ERC721 {
            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) public 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);
        }