NFT Transfer Selector

const ERC721TransferSelector = web3.utils.toBN(0);
const ERC721SafeTransferSelector = web3.utils.toBN(1);
const ERC1155SafeTransferSelector = web3.utils.toBN(2);

This protocol only supports ERC721 and ERC1155 assets. Users need to select proper selector according to their asset type and target transfer method.

interface IERC721 {
    function transferFrom(address from, address to, uint256 tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
}
interface IERC1155 {
    function safeTransferFrom(address from, address to, uint256 tokenId, uint256 amount, bytes data) external;
}

Asset Type	Target Method	Selector
ERC721	transferFrom	ERC721TransferSelector
ERC721	safeTransferFrom	ERC721SafeTransferSelector
ERC1155	safeTransferFrom	ERC1155SafeTransferSelector