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This is not erc721 standard this is erc20 standard function. For the etherscan to recognise your contract as erc72 your contract interface must implement the erc721 contract standard: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md. I don't see your safeTransfer function or ApprovalForAll event. The etherscan recognises your contract as erc20 ...

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