练习 2: 创建你的首个跨链NFT

代码时间 🎉

CCIP 配置参数

参数Arbitrum SepoliaEthereum Sepolia

Chain Selector

Copy

3478487238524512106

Copy

16015286601757825753

CCIP 路由合约地址

0x2a9c5afb0d0e4bab2bcdae109ec4b0c4be15a165

0x0bf3de8c5d3e8a2b34d2beeb17abfcebaf363a59

LINK Token i之

0xb1D4538B4571d411F07960EF2838Ce337FE1E80E

0x779877A7B0D9E8603169DdbD7836e478b4624789

开始使用

您可以使用任何区块链开发框架来使用Chainlink CCIP。对于本次训练营,我们准备了Hardhat、Foundry 和 Remix IDE 的步骤说明。

让我们创建一个新项目。

确保你已安装 Node.jsNPM。使用下列命令进行检查:

node -v
npm -v

创建一个新的文件夹并命名为ccip-masterclass-3

mkdir ccip-masterclass-3

进入该文件夹

cd ccip-masterclass-3

运行下面命令来创建一个新的Hardhat工程:

npx hardhat init

然后选择"Create a TypeScript project"。

或者你可以克隆:

要使用Chainlink CCIP,您需要与 @chainlink/contracts-ccip NPM 包中的一些Chainlink CCIP特定合约进行交互。

安装此包,请按照您用于本x的开发环境进行操作。

npm i @chainlink/contracts-ccip --save-dev

我们还需要一个标准的 @chainlink/contracts NPM包用于本模块,所以在这里我们也可以通过运行以下命令来安装它:

npm i @chainlink/contracts --save-dev

最后,对于本次练习,我们还需要安装 @openzeppelin/contracts NPM包。为此,请运行以下命令:

npm i @openzeppelin/contracts --save-dev

水龙头

您可以使用 LINK 代币或给定区块链上的原生代币/wrapped原生代币来支付 CCIP 费用。在本次练习中,我们需要至少 1 个 LINK 或 Arbitrum Sepolia 测试网代币。要获取它,请前往https://faucets.chain.link/arbitrum-sepolia

开发xNFT智能合约

contracts文件夹中创建新文件XNFT.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {ERC721URIStorage} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import {ERC721Burnable} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {Client} from "@chainlink/contracts-ccip/src/v0.8/ccip/libraries/Client.sol";
import {IRouterClient} from "@chainlink/contracts-ccip/src/v0.8/ccip/interfaces/IRouterClient.sol";
import {IAny2EVMMessageReceiver} from "@chainlink/contracts-ccip/src/v0.8/ccip/interfaces/IAny2EVMMessageReceiver.sol";
import {OwnerIsCreator} from "@chainlink/contracts-ccip/src/v0.8/shared/access/OwnerIsCreator.sol";
import {LinkTokenInterface} from "@chainlink/contracts/src/v0.8/interfaces/LinkTokenInterface.sol";

/**
 * THIS IS AN EXAMPLE CONTRACT THAT USES HARDCODED VALUES FOR CLARITY.
 * THIS IS AN EXAMPLE CONTRACT THAT USES UN-AUDITED CODE.
 * DO NOT USE THIS CODE IN PRODUCTION.
 */
contract XNFT is
    ERC721,
    ERC721URIStorage,
    ERC721Burnable,
    IAny2EVMMessageReceiver,
    ReentrancyGuard,
    OwnerIsCreator
{
    using SafeERC20 for IERC20;

    enum PayFeesIn {
        Native,
        LINK
    }

    error InvalidRouter(address router);
    error OnlyOnArbitrumSepolia();
    error NotEnoughBalanceForFees(
        uint256 currentBalance,
        uint256 calculatedFees
    );
    error NothingToWithdraw();
    error FailedToWithdrawEth(address owner, address target, uint256 value);
    error ChainNotEnabled(uint64 chainSelector);
    error SenderNotEnabled(address sender);
    error OperationNotAllowedOnCurrentChain(uint64 chainSelector);

    struct XNftDetails {
        address xNftAddress;
        bytes ccipExtraArgsBytes;
    }

    uint256 constant ARBITRUM_SEPOLIA_CHAIN_ID = 421614;

    string[] characters = [
        "https://ipfs.io/ipfs/QmTgqnhFBMkfT9s8PHKcdXBn1f5bG3Q5hmBaR4U6hoTvb1?filename=Chainlink_Elf.png",
        "https://ipfs.io/ipfs/QmZGQA92ri1jfzSu61JRaNQXYg1bLuM7p8YT83DzFA2KLH?filename=Chainlink_Knight.png",
        "https://ipfs.io/ipfs/QmW1toapYs7M29rzLXTENn3pbvwe8ioikX1PwzACzjfdHP?filename=Chainlink_Orc.png",
        "https://ipfs.io/ipfs/QmPMwQtFpEdKrUjpQJfoTeZS1aVSeuJT6Mof7uV29AcUpF?filename=Chainlink_Witch.png"
    ];

    IRouterClient internal immutable i_ccipRouter;
    LinkTokenInterface internal immutable i_linkToken;
    uint64 private immutable i_currentChainSelector;

    uint256 private _nextTokenId;

    mapping(uint64 destChainSelector => XNftDetails xNftDetailsPerChain)
        public s_chains;

    event ChainEnabled(
        uint64 chainSelector,
        address xNftAddress,
        bytes ccipExtraArgs
    );
    event ChainDisabled(uint64 chainSelector);
    event CrossChainSent(
        address from,
        address to,
        uint256 tokenId,
        uint64 sourceChainSelector,
        uint64 destinationChainSelector
    );
    event CrossChainReceived(
        address from,
        address to,
        uint256 tokenId,
        uint64 sourceChainSelector,
        uint64 destinationChainSelector
    );

    modifier onlyRouter() {
        if (msg.sender != address(i_ccipRouter))
            revert InvalidRouter(msg.sender);
        _;
    }

    modifier onlyOnArbitrumSepolia() {
        if (block.chainid != ARBITRUM_SEPOLIA_CHAIN_ID)
            revert OnlyOnArbitrumSepolia();
        _;
    }

    modifier onlyEnabledChain(uint64 _chainSelector) {
        if (s_chains[_chainSelector].xNftAddress == address(0))
            revert ChainNotEnabled(_chainSelector);
        _;
    }

    modifier onlyEnabledSender(uint64 _chainSelector, address _sender) {
        if (s_chains[_chainSelector].xNftAddress != _sender)
            revert SenderNotEnabled(_sender);
        _;
    }

    modifier onlyOtherChains(uint64 _chainSelector) {
        if (_chainSelector == i_currentChainSelector)
            revert OperationNotAllowedOnCurrentChain(_chainSelector);
        _;
    }

    constructor(
        address ccipRouterAddress,
        address linkTokenAddress,
        uint64 currentChainSelector
    ) ERC721("Cross Chain NFT", "XNFT") {
        if (ccipRouterAddress == address(0)) revert InvalidRouter(address(0));
        i_ccipRouter = IRouterClient(ccipRouterAddress);
        i_linkToken = LinkTokenInterface(linkTokenAddress);
        i_currentChainSelector = currentChainSelector;
    }

    function mint() external onlyOnArbitrumSepolia {
        uint256 tokenId = _nextTokenId++;
        string memory uri = characters[tokenId % characters.length];
        _safeMint(msg.sender, tokenId);
        _setTokenURI(tokenId, uri);
    }

    function enableChain(
        uint64 chainSelector,
        address xNftAddress,
        bytes memory ccipExtraArgs
    ) external onlyOwner onlyOtherChains(chainSelector) {
        s_chains[chainSelector] = XNftDetails({
            xNftAddress: xNftAddress,
            ccipExtraArgsBytes: ccipExtraArgs
        });

        emit ChainEnabled(chainSelector, xNftAddress, ccipExtraArgs);
    }

    function disableChain(
        uint64 chainSelector
    ) external onlyOwner onlyOtherChains(chainSelector) {
        delete s_chains[chainSelector];

        emit ChainDisabled(chainSelector);
    }

    function crossChainTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        uint64 destinationChainSelector,
        PayFeesIn payFeesIn
    )
        external
        nonReentrant
        onlyEnabledChain(destinationChainSelector)
        returns (bytes32 messageId)
    {
        string memory tokenUri = tokenURI(tokenId);
        _burn(tokenId);

        Client.EVM2AnyMessage memory message = Client.EVM2AnyMessage({
            receiver: abi.encode(
                s_chains[destinationChainSelector].xNftAddress
            ),
            data: abi.encode(from, to, tokenId, tokenUri),
            tokenAmounts: new Client.EVMTokenAmount[](0),
            extraArgs: s_chains[destinationChainSelector].ccipExtraArgsBytes,
            feeToken: payFeesIn == PayFeesIn.LINK
                ? address(i_linkToken)
                : address(0)
        });

        // Get the fee required to send the CCIP message
        uint256 fees = i_ccipRouter.getFee(destinationChainSelector, message);

        if (payFeesIn == PayFeesIn.LINK) {
            if (fees > i_linkToken.balanceOf(address(this)))
                revert NotEnoughBalanceForFees(
                    i_linkToken.balanceOf(address(this)),
                    fees
                );

            // Approve the Router to transfer LINK tokens on contract's behalf. It will spend the fees in LINK
            i_linkToken.approve(address(i_ccipRouter), fees);

            // Send the message through the router and store the returned message ID
            messageId = i_ccipRouter.ccipSend(
                destinationChainSelector,
                message
            );
        } else {
            if (fees > address(this).balance)
                revert NotEnoughBalanceForFees(address(this).balance, fees);

            // Send the message through the router and store the returned message ID
            messageId = i_ccipRouter.ccipSend{value: fees}(
                destinationChainSelector,
                message
            );
        }

        emit CrossChainSent(
            from,
            to,
            tokenId,
            i_currentChainSelector,
            destinationChainSelector
        );
    }

    /// @inheritdoc IAny2EVMMessageReceiver
    function ccipReceive(
        Client.Any2EVMMessage calldata message
    )
        external
        virtual
        override
        onlyRouter
        nonReentrant
        onlyEnabledChain(message.sourceChainSelector)
        onlyEnabledSender(
            message.sourceChainSelector,
            abi.decode(message.sender, (address))
        )
    {
        uint64 sourceChainSelector = message.sourceChainSelector;
        (
            address from,
            address to,
            uint256 tokenId,
            string memory tokenUri
        ) = abi.decode(message.data, (address, address, uint256, string));

        _safeMint(to, tokenId);
        _setTokenURI(tokenId, tokenUri);

        emit CrossChainReceived(
            from,
            to,
            tokenId,
            sourceChainSelector,
            i_currentChainSelector
        );
    }

    function withdraw(address _beneficiary) public onlyOwner {
        uint256 amount = address(this).balance;

        if (amount == 0) revert NothingToWithdraw();

        (bool sent, ) = _beneficiary.call{value: amount}("");

        if (!sent) revert FailedToWithdrawEth(msg.sender, _beneficiary, amount);
    }

    function withdrawToken(
        address _beneficiary,
        address _token
    ) public onlyOwner {
        uint256 amount = IERC20(_token).balanceOf(address(this));

        if (amount == 0) revert NothingToWithdraw();

        IERC20(_token).safeTransfer(_beneficiary, amount);
    }

    function tokenURI(
        uint256 tokenId
    ) public view override(ERC721, ERC721URIStorage) returns (string memory) {
        return super.tokenURI(tokenId);
    }

    function getCCIPRouter() public view returns (address) {
        return address(i_ccipRouter);
    }

    function supportsInterface(
        bytes4 interfaceId
    ) public view override(ERC721, ERC721URIStorage) returns (bool) {
        return
            interfaceId == type(IAny2EVMMessageReceiver).interfaceId ||
            super.supportsInterface(interfaceId);
    }
}

运行以下指令来编译:

npx hardhat compile

准备部署

按照步骤添加必要的环境变量,以便部署这些合约并发送您的第一个 CCIP 消息。

该合约需要至少 0.8.20 的 Solidity 版本。因为在 0.8.20 版本的 Solc 中,默认的 EVM 版本为“上海”。在上海升级中,一个新的操作码 PUSH0 被添加到以太坊虚拟机中。

然而,除了以太坊外的大多数区块链尚未支持 PUSH0 操作码。

这意味着 PUSH0 操作码现在是合约字节码的一部分,如果您正在使用的链不支持它,它将会报出“无效操作码”错误。

为了了解更多信息,我们强烈建议您查看此 StackOverflow 的回复:

在不同的开发环境下设置solc EVM版本

我们将使用 @chainlink/env-enc包来提高安全性。它通过创建一个新的 .env.enc 文件来加密敏感数据,而不是将其以明文形式存储在 .env 文件中。虽然不建议将此文件上传到网络,但如果意外发生,您的机密信息仍然会被加密。 通过运行以下命令来安装该包:

npm i @chainlink/env-enc --save-dev

设置一个密码用于加密和解密环境变量文件。您可以稍后通过输入相同的命令来更改密码。

npx env-enc set-pw

现在设置以下环境变量:PRIVATE_KEY、源区块链的 RPC URL、目标区块链的 RPC URL。在此示例中,我们将使用 Arbitrum Sepolia 和 Ethereum Sepolia。

PRIVATE_KEY=""
ARBITRUM_SEPOLIA_RPC_URL=""
ETHEREUM_SEPOLIA_RPC_URL=""

要设置以上变量,请输入以下命令并按照终端中的说明进行操作:

npx env-enc set

完成以上操作后,.env.enc 文件将自动生成。如果您想验证您的输入,可以随时运行以下命令:

npx env-enc view

最后,扩展 hardhat.config 文件以支持这两个网络:

import * as dotenvenc from '@chainlink/env-enc'
dotenvenc.config();

import { HardhatUserConfig } from 'hardhat/config';
import '@nomicfoundation/hardhat-toolbox';

const PRIVATE_KEY = process.env.PRIVATE_KEY;
const ARBITRUM_SEPOLIA_RPC_URL = process.env.ARBITRUM_SEPOLIA_RPC_URL;
const ETHEREUM_SEPOLIA_RPC_URL = process.env.ETHEREUM_SEPOLIA_RPC_URL;

const config: HardhatUserConfig = {
  solidity: {
    compilers: [
      {
          version: '0.8.20',
          settings: {
              evmVersion: 'paris'
          }
      }
    ]
  },
  networks: {
    hardhat: {
      chainId: 31337
    },
    arbitrumSepolia: {
      url: ARBITRUM_SEPOLIA_RPC_URL !== undefined ? ARBITRUM_SEPOLIA_RPC_URL : '',
      accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
      chainId: 421614
    },
    ethereumSepolia: {
      url: ETHEREUM_SEPOLIA_RPC_URL !== undefined ? ETHEREUM_SEPOLIA_RPC_URL : '',
      accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
      chainId: 11155111
    },
  }
};

export default config;

步骤1)在Ethereum Sepolia上部署XNFT.sol

准备 Ethereum Sepolia 的 Chain Selector 和 CCIP Router & LINK 代币合约地址。您可以在页面开头滚动查看以获取这些地址。CCIP 配置参数

进入scripts文件夹并创建一个名为 deployXNFT.ts的新文件。

// deployXNFT.ts

import { ethers, network } from "hardhat";

async function main() {
    const ccipRouterAddressEthereumSepolia = `0x0bf3de8c5d3e8a2b34d2beeb17abfcebaf363a59`;
    const linkTokenAddressEthereumSepolia = `0x779877A7B0D9E8603169DdbD7836e478b4624789`;
    const chainIdEthereumSepolia = `16015286601757825753`;

    const xNft = await ethers.deployContract("XNFT", [
        ccipRouterAddressEthereumSepolia,
        linkTokenAddressEthereumSepolia,
        chainIdEthereumSepolia
    ]);

    await xNft.waitForDeployment();

    console.log(`XNFT deployed on ${network.name} with address ${xNft.target}`);
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
    console.error(error);
    process.exitCode = 1;
});

运行部署脚本:

npx hardhat run ./scripts/deployXNFT.ts --network ethereumSepolia

步骤 2) 在Arbitrum Sepolia上部署XNFT.sol

准备 Arbitrum Sepolia 的 Chain Selector 和 CCIP Router & LINK 代币合约地址。您可以在页面开头滚动查看以获取这些地址。CCIP 配置参数

进入scripts文件夹并创建一个名为 deployXNFTArbitrum.ts的新文件。

// deployXNFTArbitrum.ts

import { ethers, network } from "hardhat";

async function main() {
    const ccipRouterAddressArbitrumSepolia = `0x2a9c5afb0d0e4bab2bcdae109ec4b0c4be15a165`;
    const linkTokenAddressArbitrumSepolia = `0xb1D4538B4571d411F07960EF2838Ce337FE1E80E`;
    const chainIdArbitrumSepolia = `3478487238524512106`;

    const xNft = await ethers.deployContract("XNFT", [
        ccipRouterAddressArbitrumSepolia,
        linkTokenAddressArbitrumSepolia,
        chainIdArbitrumSepolia
    ]);

    await xNft.waitForDeployment();

    console.log(`XNFT deployed on ${network.name} with address ${xNft.target}`);
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
    console.error(error);
    process.exitCode = 1;
});

运行部署脚本:

npx hardhat run ./scripts/deployXNFTArbitrum.ts --network arbitrumSepolia

步骤 3) 在Ethereum Sepolia网络中, 调用enableChain方法

需要准备:

  • 您之前部署到 Ethereum Sepolia 的 XNFT.sol 智能合约地址;

  • 您之前部署到 Arbitrum Sepolia 的 XNFT.sol 智能合约地址;

  • chainSelector 参数:3478487238524512106,这是 Arbitrum Sepolia 网络的 CCIP Chain Selector;

  • ccipExtraArgs 参数:0x97a657c90000000000000000000000000000000000000000000000000000000000030d40,这是 CCIP extraArgs 的bytes版本,其中gasLimit为默认值 200_000。

如果您想自己计算这个值,可以重用以下辅助智能合约:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {Client} from "@chainlink/contracts-ccip/src/v0.8/ccip/libraries/Client.sol";

contract EncodeExtraArgs {
  // 以下是一个使用存储的简单示例(所有消息使用相同的参数),该示例允许在不升级dapp的情况下添加新选项。
  // 请注意,额外参数是由链种类决定的(比如,gasLimit是EVM特有的等),并且始终向后兼容,即升级是可选择的。
  // 我们可以在链下计算V1 extraArgs:
  //    Client.EVMExtraArgsV1 memory extraArgs = Client.EVMExtraArgsV1({gasLimit: 300_000});
  //    bytes memory encodedV1ExtraArgs = Client._argsToBytes(extraArgs);
  // 如果V2增加了一个退款功能,可按照以下方式计算V2 extraArgs并用新的extraArgs更新存储:
  //    Client.EVMExtraArgsV2 memory extraArgs = Client.EVMExtraArgsV2({gasLimit: 300_000, destRefundAddress: 0x1234});
  //    bytes memory encodedV2ExtraArgs = Client._argsToBytes(extraArgs);
  // 如果不同的消息需要不同的选项,如:gasLimit不同,可以简单地基于(chainSelector, messageType)而不是只基于chainSelector进行存储。
  
  function encode(uint256 gasLimit) external pure returns(bytes memory extraArgsBytes) {
      Client.EVMExtraArgsV1 memory extraArgs = Client.EVMExtraArgsV1({gasLimit: gasLimit});
      extraArgsBytes = Client._argsToBytes(extraArgs);
  }
}

scripts文件夹中创建TypeScript文件enableChain.ts

// scripts/enableChain.ts

import { ethers, network } from "hardhat";
import { Wallet } from "ethers";
import { XNFT, XNFT__factory } from "../typechain-types";

async function main() {
  if (network.name !== `ethereumSepolia`) {
    console.error(`Must be called from Ethereum Sepolia`);
    return 1;
  }

  const privateKey = process.env.PRIVATE_KEY!;
  const rpcProviderUrl = process.env.AVALANCHE_FUJI_RPC_URL;

  const provider = new ethers.JsonRpcProvider(rpcProviderUrl);
  const wallet = new Wallet(privateKey);
  const signer = wallet.connect(provider);

  const xNftAddressEthereumSepolia = `PUT XNFT ADDRESS ON ETHEREUM SEPOLIA HERE`;
  const xNftAddressArbitrumSepolia = `PUT XNFT ADDRESS ON ARBITRUM SEPOLIA HERE`;
  const chainSelectorArbitrumSepolia = `3478487238524512106`;
  const ccipExtraArgs = `0x97a657c90000000000000000000000000000000000000000000000000000000000030d40`;

  const xNft: XNFT = XNFT__factory.connect(xNftAddressEthereumSepolia, signer);

  const tx = await xNft.enableChain(
      chainSelectorArbitrumSepolia,
      xNftAddressArbitrumSepolia,
      ccipExtraArgs
  );

  console.log(`Transaction hash: ${tx.hash}`);
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

运行以下指令来调用enableChain方法:

npx hardhat run ./scripts/enableChain.ts --network ethereumSepolia

步骤 4) 在Arbitrum Sepolia网络中, 调用enableChain方法

需要准备:

  • 您之前部署到 Arbitrum Sepolia 的 XNFT.sol 智能合约地址;

  • 您之前部署到 Ethereum Sepolia 的 XNFT.sol 智能合约地址,作为 xNftAddress 参数;

  • chainSelector 参数:16015286601757825753,这是 Ethereum Sepolia 网络的 CCIP Chain Selector;

  • ccipExtraArgs 参数:0x97a657c90000000000000000000000000000000000000000000000000000000000030d40,这是 CCIP extraArgs 的bytes版本,其中gasLimit为默认值 200_000。

如果您想自己计算这个值,可以重用以下辅助智能合约:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {Client} from "@chainlink/contracts-ccip/src/v0.8/ccip/libraries/Client.sol";

contract EncodeExtraArgs {
  // 以下是一个使用存储的简单示例(所有消息使用相同的参数),该示例允许在不升级dapp的情况下添加新选项。
  // 请注意,额外参数是由链种类决定的(比如,gasLimit是EVM特有的等),并且始终向后兼容,即升级是可选择的。
  // 我们可以在链下计算V1 extraArgs:
  //    Client.EVMExtraArgsV1 memory extraArgs = Client.EVMExtraArgsV1({gasLimit: 300_000});
  //    bytes memory encodedV1ExtraArgs = Client._argsToBytes(extraArgs);
  // 如果V2增加了一个退款功能,可按照以下方式计算V2 extraArgs并用新的extraArgs更新存储:
  //    Client.EVMExtraArgsV2 memory extraArgs = Client.EVMExtraArgsV2({gasLimit: 300_000, destRefundAddress: 0x1234});
  //    bytes memory encodedV2ExtraArgs = Client._argsToBytes(extraArgs);
  // 如果不同的消息需要不同的选项,如:gasLimit不同,可以简单地基于(chainSelector, messageType)而不是只基于chainSelector进行存储。
  
  function encode(uint256 gasLimit) external pure returns(bytes memory extraArgsBytes) {
      Client.EVMExtraArgsV1 memory extraArgs = Client.EVMExtraArgsV1({gasLimit: gasLimit});
      extraArgsBytes = Client._argsToBytes(extraArgs);
  }
}

scripts文件夹中创建TypeScript文件enableChainArbitrum.ts

// scripts/enableChainArbitrum.ts

import { ethers, network } from "hardhat";
import { Wallet } from "ethers";
import { XNFT, XNFT__factory } from "../typechain-types";

async function main() {
  if (network.name !== `arbitrumSepolia`) {
    console.error(`Must be called from Arbitrum Sepolia`);
    return 1;
  }

  const privateKey = process.env.PRIVATE_KEY!;
  const rpcProviderUrl = process.env.AVALANCHE_FUJI_RPC_URL;

  const provider = new ethers.JsonRpcProvider(rpcProviderUrl);
  const wallet = new Wallet(privateKey);
  const signer = wallet.connect(provider);

  const xNftAddressArbitrumSepolia = `PUT XNFT ADDRESS ON ARBITRUM SEPOLIA HERE`;
  const xNftAddressEthereumSepolia = `PUT XNFT ADDRESS ON ETHEREUM SEPOLIA HERE`;
  const chainSelectorEthereumSepolia = `16015286601757825753`;
  const ccipExtraArgs = `0x97a657c90000000000000000000000000000000000000000000000000000000000030d40`;

  const xNft: XNFT = XNFT__factory.connect(xNftAddressArbitrumSepolia, signer);

  const tx = await xNft.enableChain(
      chainSelectorEthereumSepolia,
      xNftAddressEthereumSepolia,
      ccipExtraArgs
  );

  console.log(`Transaction hash: ${tx.hash}`);
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

运行以下指令来调用enableChain方法:

npx hardhat run ./scripts/enableChainArbitrum.ts --network arbitrumSepolia

为支付 CCIP 费用,向XNFT.sol充值一定数量的 LINK。3 个 LINK 对于此演示应该绰绰有余。当然,为了实现完整的功能,您还应在其他区块链上为XNFT.sol智能合约充值,以便在所有区块链之间执行跨链转账。

步骤 6) 在Arbitrum Sepolia网络中, 铸造新的xNFT

scripts文件夹中创建TypeScript文件mint.ts:

// scripts/mint.ts

import { ethers, network } from "hardhat";
import { Wallet } from "ethers";
import { XNFT, XNFT__factory } from "../typechain-types";

async function main() {
  if (network.name !== `arbitrumSepolia`) {
    console.error(`Must be called from Arbitrum Sepolia`);
    return 1;
  }

  const privateKey = process.env.PRIVATE_KEY!;
  const rpcProviderUrl = process.env.AVALANCHE_FUJI_RPC_URL;

  const provider = new ethers.JsonRpcProvider(rpcProviderUrl);
  const wallet = new Wallet(privateKey);
  const signer = wallet.connect(provider);

  const xNftAddressArbitrumSepolia = `PUT XNFT ADDRESS ON ARBITRUM SEPOLIA HERE`;

  const xNft: XNFT = XNFT__factory.connect(xNftAddressArbitrumSepolia, signer);

  const tx = await xNft.mint();

  console.log(`Transaction hash: ${tx.hash}`);
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

运行以下指令调用mint方法:

npx hardhat run ./scripts/mint.ts --network arbitrumSepolia

步骤 7) 在Arbitrum Sepolia网络中, 跨链转移xNFT

需要准备:

  • from 参数:您的 EOA 地址;

  • to 参数:您希望跨链转移您的 NFT 的另一个链上的 EOA 地址,可以是您的 EOA 地址;

  • tokenId 参数:您要跨链转移的 xNFT 的 ID;

  • destinationChainSelector 参数:16015286601757825753,这是 Ethereum Sepolia 区块链的 CCIP Chain Selector;

  • payFeesIn 参数:1,表示我们用 LINK 支付 CCIP 费用。

scripts 文件夹下创建一个 TypeScript 文件crossChainTransferFrom.ts

// scripts/crossChainTransfer.ts

import { ethers, network } from "hardhat";
import { Wallet } from "ethers";
import { XNFT, XNFT__factory } from "../typechain-types";

async function main() {
  if (network.name !== `arbitrumSepolia`) {
    console.error(`Must be called from Arbitrum Sepolia`);
    return 1;
  }

  const privateKey = process.env.PRIVATE_KEY!;
  const rpcProviderUrl = process.env.AVALANCHE_FUJI_RPC_URL;

  const provider = new ethers.JsonRpcProvider(rpcProviderUrl);
  const wallet = new Wallet(privateKey);
  const signer = wallet.connect(provider);

  const xNftAddressArbitrumSepolia = `PUT XNFT ADDRESS ON ARBITRUM SEPOLIA HERE`;
  
  const from = `PUT YOUR EOA ADDRESS HERE`;
  const to = `PUT RECEIVER's ADDRESS HERE`;
  const tokenId = 0; // put NFT token id here
  const destinationChainSelector = `16015286601757825753`;
  const payFeesIn = 1; // 0 - Native, 1 - LINK

  const xNft: XNFT = XNFT__factory.connect(xNftAddressArbitrumSepolia, signer);

  const tx = await xNft.crossChainTransferFrom(
      from,
      to,
      tokenId,
      destinationChainSelector,
      payFeesIn
  );

  console.log(`Transaction hash: ${tx.hash}`);
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

运行以下指令调用crossChainTransferFrom方法:

npx hardhat run ./scripts/crossChainTransfer.ts --network arbitrumSepolia

您现在可以在 CCIP Explorer 页面监控此次NFT的跨链转移。

一旦跨链 NFT 到达 Ethereum Sepolia,您可以在 Metamask 钱包中手动显示它。点击进入“NFT”选项卡并点击“Import NFT”按钮。

然后填写 Ethereum Sepolia 上的 XNFT.sol 智能合约地址和您收到的代币 ID(0)。

最后,您的 NFT 将显示在 Metamask 钱包中。

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