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20 lines
1001 B
20 lines
1001 B
7 years ago
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pragma solidity ^0.4.18;
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contract ERC721Receiver {
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/// @dev Magic value to be returned upon successful reception of an NFT
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/// Equals to bytes4(keccak256("onERC721Received(address,uint256,bytes)"))
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bytes4 ERC721_RECEIVED = 0xf0b9e5ba;
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/// @notice Handle the receipt of an NFT
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/// @dev The ERC721 smart contract calls this function on the recipient
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/// after a `safetransfer`. This function MAY throw to revert and reject the
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/// transfer. This function MUST use 50,000 gas or less. Return of other
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/// than the magic value MUST result in the transaction being reverted.
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/// Note: the contract address is always the message sender.
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/// @param _from The sending address
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/// @param _tokenId The NFT identifier which is being transfered
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/// @param _data Additional data with no specified format
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/// @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
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function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
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}
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