带版税的nft分红代币合约

以下是一个带版税的 NFT 分红代币合约示例代码，该合约将以固定比例向 NFT 所有者支付版税，并允许用户持有 NFT 分红代币。

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

contract NFTDividendToken is ERC20 {
    address private _nftAddress;
    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;
    mapping(uint256 => uint256) private _dividends;
    mapping(uint256 => address) private _owners;
    uint256 private _royaltyRate; // 版税比例，0-100

    constructor(address nftAddress, uint256 royaltyRate)
        ERC20("NFT Dividend Token", "NDT")
    {
        _nftAddress = nftAddress;
        _royaltyRate = royaltyRate;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function dividendsOf(uint256 tokenId) public view returns (uint256) {
        return _dividends[tokenId];
    }

    function claimDividends(uint256[] memory tokenIds) public {
        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 tokenId = tokenIds[i];
            uint256 dividends = _dividends[tokenId];
            _dividends[tokenId] = 0;
            _balances[msg.sender] += dividends;
            _totalSupply += dividends;
            emit Transfer(address(0), msg.sender, dividends);
        }
    }

    function addDividends(uint256[] memory tokenIds, uint256 amount) public {
        IERC721 nft = IERC721(_nftAddress);
        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 tokenId = tokenIds[i];
            address owner = nft.ownerOf(tokenId);
            uint256 royalty = (amount * _royaltyRate) / 100; // 计算版税
            uint256 dividends = amount - royalty; // 计算分红
            _dividends[tokenId] += dividends;
            _balances[owner] += dividends;
            _totalSupply += dividends;
            _owners[tokenId] = owner;
            if (royalty > 0) {
                // 向版权持有者支付版税
                nft.safeTransferFrom(address(this), _owners[tokenId], tokenId);
            }
            emit Transfer(address(0), owner, dividends);
        }
    }
}

该合约继承了 OpenZeppelin 的 ERC20 合约，允许用户持有 NFT 分红代币。该合约在 `addDividends` 函数中计算版税和分红，并将版税转移给 NFT 版权持有者。版税比例由合约构造函数中的 `royaltyRate` 参数指定。当管理员添加分红时，合约会将每个 NFT tokenId 的分红金额增加，并将所有者的余额增加，同时将总供应量增加。当用户领取分红时，合约会将他们的余额增加并将总供应量增加，并发出一个 ERC20 转账事件。