// https://eips.ethereum.org/EIPS/eip-721, http://erc721.org/ 
      // SPDX-License-Identifier: MIT
      pragma solidity >=0.5.0 <0.8.0;
      
      /// @title ERC-721 Non-Fungible Token Standard
      /// @dev See https://eips.ethereum.org/EIPS/eip-721
      ///  Note: the ERC-165 identifier for this interface is 0x80ac58cd.
      interface ERC721 /* is ERC165 */ {
          /// @dev This emits when ownership of any NFT changes by any mechanism.
          ///  This event emits when NFTs are created (`from` == 0) and destroyed
          ///  (`to` == 0). Exception: during contract creation, any number of NFTs
          ///  may be created and assigned without emitting Transfer. At the time of
          ///  any transfer, the approved address for that NFT (if any) is reset to none.
          event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
      
          /// @dev This emits when the approved address for an NFT is changed or
          ///  reaffirmed. The zero address indicates there is no approved address.
          ///  When a Transfer event emits, this also indicates that the approved
          ///  address for that NFT (if any) is reset to none.
          event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
      
          /// @dev This emits when an operator is enabled or disabled for an owner.
          ///  The operator can manage all NFTs of the owner.
          event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
      
          /// @notice Count all NFTs assigned to an owner
          /// @dev NFTs assigned to the zero address are considered invalid, and this
          ///  function throws for queries about the zero address.
          /// @param _owner An address for whom to query the balance
          /// @return The number of NFTs owned by `_owner`, possibly zero
          function balanceOf(address _owner) external view returns (uint256);
      
          /// @notice Find the owner of an NFT
          /// @dev NFTs assigned to zero address are considered invalid, and queries
          ///  about them do throw.
          /// @param _tokenId The identifier for an NFT
          /// @return The address of the owner of the NFT
          function ownerOf(uint256 _tokenId) external view returns (address);
      
          /// @notice Transfers the ownership of an NFT from one address to another address
          /// @dev Throws unless `msg.sender` is the current owner, an authorized
          ///  operator, or the approved address for this NFT. Throws if `_from` is
          ///  not the current owner. Throws if `_to` is the zero address. Throws if
          ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
          ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
          ///  `onERC721Received` on `_to` and throws if the return value is not
          ///  `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
          /// @param _from The current owner of the NFT
          /// @param _to The new owner
          /// @param _tokenId The NFT to transfer
          /// @param data Additional data with no specified format, sent in call to `_to`
          function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes memory data) external payable;
      
          /// @notice Transfers the ownership of an NFT from one address to another address
          /// @dev This works identically to the other function with an extra data parameter,
          ///  except this function just sets data to "".
          /// @param _from The current owner of the NFT
          /// @param _to The new owner
          /// @param _tokenId The NFT to transfer
          function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
      
          /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
          ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
          ///  THEY MAY BE PERMANENTLY LOST
          /// @dev Throws unless `msg.sender` is the current owner, an authorized
          ///  operator, or the approved address for this NFT. Throws if `_from` is
          ///  not the current owner. Throws if `_to` is the zero address. Throws if
          ///  `_tokenId` is not a valid NFT.
          /// @param _from The current owner of the NFT
          /// @param _to The new owner
          /// @param _tokenId The NFT to transfer
          function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
      
          /// @notice Change or reaffirm the approved address for an NFT
          /// @dev The zero address indicates there is no approved address.
          ///  Throws unless `msg.sender` is the current NFT owner, or an authorized
          ///  operator of the current owner.
          /// @param _approved The new approved NFT controller
          /// @param _tokenId The NFT to approve
          function approve(address _approved, uint256 _tokenId) external payable;
      
          /// @notice Enable or disable approval for a third party ("operator") to manage
          ///  all of `msg.sender`'s assets
          /// @dev Emits the ApprovalForAll event. The contract MUST allow
          ///  multiple operators per owner.
          /// @param _operator Address to add to the set of authorized operators
          /// @param _approved True if the operator is approved, false to revoke approval
          function setApprovalForAll(address _operator, bool _approved) external;
      
          /// @notice Get the approved address for a single NFT
          /// @dev Throws if `_tokenId` is not a valid NFT.
          /// @param _tokenId The NFT to find the approved address for
          /// @return The approved address for this NFT, or the zero address if there is none
          function getApproved(uint256 _tokenId) external view returns (address);
      
          /// @notice Query if an address is an authorized operator for another address
          /// @param _owner The address that owns the NFTs
          /// @param _operator The address that acts on behalf of the owner
          /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
          function isApprovedForAll(address _owner, address _operator) external view returns (bool);
      }
      
      interface ERC165 {
          /// @notice Query if a contract implements an interface
          /// @param interfaceID The interface identifier, as specified in ERC-165
          /// @dev Interface identification is specified in ERC-165. This function
          ///  uses less than 30,000 gas.
          /// @return `true` if the contract implements `interfaceID` and
          ///  `interfaceID` is not 0xffffffff, `false` otherwise
          function supportsInterface(bytes4 interfaceID) external view returns (bool);
      }

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      erc721 interface

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      Shortcut: erc721i

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