# NFT Transfer Selector

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

This protocol only supports [ERC721](https://eips.ethereum.org/EIPS/eip-721) and [ERC1155](https://eips.ethereum.org/EIPS/eip-1155) assets. Users need to select proper selector according to their asset type and target transfer method.

```js
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 |


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