{
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      "inputs": [
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          "name": "_operator",
          "type": "address"
        },
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          "name": "_from",
          "type": "address"
        },
        {
          "name": "_tokenId",
          "type": "uint256"
        },
        {
          "name": "_data",
          "type": "bytes"
        }
      ],
      "name": "onERC721Received",
      "outputs": [
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          "type": "bytes4"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
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  "bytecode": "0x",
  "deployedBytecode": "0x",
  "sourceMap": "",
  "deployedSourceMap": "",
  "source": "pragma solidity ^0.4.24;\n\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ncontract ERC721Receiver {\n  /**\n   * @dev Magic value to be returned upon successful reception of an NFT\n   *  Equals to `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`,\n   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`\n   */\n  bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;\n\n  /**\n   * @notice Handle the receipt of an NFT\n   * @dev The ERC721 smart contract calls this function on the recipient\n   * after a `safetransfer`. This function MAY throw to revert and reject the\n   * transfer. Return of other than the magic value MUST result in the\n   * transaction being reverted.\n   * Note: the contract address is always the message sender.\n   * @param _operator The address which called `safeTransferFrom` function\n   * @param _from The address which previously owned the token\n   * @param _tokenId The NFT identifier which is being transferred\n   * @param _data Additional data with no specified format\n   * @return `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`\n   */\n  function onERC721Received(\n    address _operator,\n    address _from,\n    uint256 _tokenId,\n    bytes _data\n  )\n    public\n    returns(bytes4);\n}\n",
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