React Native DApp 开发全栈实战·从 0 到 1 系列（跨链转账-合约部分）

木西
发布于 6小时前
阅读 46

前言本文借助Hardhat+ChainlinkCCIP接口+OpenZeppelin搭建一条最小可运行的跨链铸币链路：用户在源链调用transferCrossChain并支付手续费；MockRouter模拟Chainlink路由器完成费用计算与消息发出；Des

# 前言
> 本文借助**Hardhat + Chainlink CCIP 接口 + OpenZeppelin** 搭建一条**最小可运行的跨链铸币链路**：
>1.  用户在 **源链** 调用 `transferCrossChain` 并支付手续费；
>1.  **MockRouter** 模拟 Chainlink 路由器完成费用计算与消息发出；
>1.  **DestinationMinter**（CCIPReceiver）在 **目标链** 接收消息并铸币；
>1.  全流程通过 **本地双节点 + 双链部署 + 事件断言** 验证，**无需测试网 LINK** 即可调试。
>
> 阅读完你将得到：
>-   一套可复制的 **Lock-Mint** 跨链代码；
>-   **MockRouter** 规避嵌套类型编译错误的技巧；
>-   **Hardhat 双链并发**与 **impersonate** 测试方案；
>-   可平滑迁移到 **正式 CCIP Router** 的接口兼容层。
# 前期准备
* **hardhat.config.js配置**:主要针对network项的配置，便于本地跨链转账测试
* **核心代码配置**
```
 networks:{
    hardhat: {
      chainId: 1337,           // 节点将使用这个 id
    },
    localA: { url: "http://127.0.0.1:8545", chainId: 1337,  saveDeployments: true, },//src
    localB: { url: "http://127.0.0.1:8546", chainId: 1338,  saveDeployments: true, },//dst
    }
```
# 智能合约
* ### 代币合约
```
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";

contract MyToken4 is ERC20, ERC20Burnable, AccessControl {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

constructor(
        string memory name_,
        string memory symbol_,
        address[] memory initialMinters   // 👈 部署时一次性给多地址授权
    ) ERC20(name_, symbol_) {
        // 部署者拥有 DEFAULT_ADMIN_ROLE（可继续授权/撤销）
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);

// 把 MINTER_ROLE 给所有传入地址
        for (uint256 i = 0; i < initialMinters.length; ++i) {
            _grantRole(MINTER_ROLE, initialMinters[i]);
        }

// 给部署者自己先发 1000 个
        _mint(msg.sender, 1000 * 10 ** decimals());
    }

// 任何拥有 MINTER_ROLE 的人都能铸币
    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
        _mint(to, amount);
    }
}
```
* ### MockCCIPRouter合约
  - **特别说明**:`保证本地部署的合约中包含MockCCIPRouter所有的方法，以及applyRampUpdates方法通过用 bytes 绕过嵌套类型命名`
```
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import { IRouterClient } from "@chainlink/contracts-ccip/contracts/interfaces/IRouterClient.sol";
import { Client } from "@chainlink/contracts-ccip/contracts/libraries/Client.sol";

contract MockCCIPRouter is IRouterClient {
    uint256 public fee = 0.001 ether;

function ccipSend(uint64, Client.EVM2AnyMessage calldata)
        external
        payable
        override
        returns (bytes32)
    {
        require(msg.value >= fee, "Insufficient fee");
        return keccak256(abi.encodePacked(msg.sender, block.timestamp));
    }

function getFee(uint64, Client.EVM2AnyMessage calldata)
        external
        pure
        override
        returns (uint256)
    {
        return 0.001 ether;
    }

function isChainSupported(uint64) external pure override returns (bool) {
        return true;
    }

function getSupportedTokens(uint64)
        external
        pure
        
        returns (address[] memory)
    {
        return new address[](0);
    }

function getPool(uint64, address) external pure  returns (address) {
        return address(0);
    }

// ✅ 用 bytes 绕过嵌套类型命名
    function applyRampUpdates(
        bytes calldata,
        bytes calldata,
        bytes calldata
    ) external pure  {}
}
```
* ### SourceMinter合约
```
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {IRouterClient} from "@chainlink/contracts-ccip/contracts/interfaces/IRouterClient.sol";
import {Client} from "@chainlink/contracts-ccip/contracts/libraries/Client.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract SourceMinter is Ownable {
    IRouterClient public router;
    uint64   public destChainSelector; // 1338
    address  public destMinter;        // 目标链 DestinationMinter 地址

event CCIPSendRequested(bytes32 msgId, uint256 amount);

constructor(address _router, uint64 _destChainSelector, address _destMinter,address _owner) Ownable(_owner) {
        router = IRouterClient(_router);
        destChainSelector = _destChainSelector;
        destMinter = _destMinter;
    }

/**
     * 用户入口：锁定 amount 个 Link，发起 CCIP 跨链转账
     */
    function transferCrossChain(uint256 amount) external returns (bytes32 msgId) {
        // 1. 构造 CCIP 消息
        Client.EVM2AnyMessage memory message = Client.EVM2AnyMessage({
            receiver: abi.encode(destMinter),
            data: abi.encode(msg.sender, amount), // 把 (to,amount) 发到对端
            tokenAmounts: new Client.EVMTokenAmount[](0), // 本例不直接搬 token，只发消息
            extraArgs: "",
            feeToken: address(0) // 用原生币付 CCIP 手续费；也可填 LINK
        });

// 2. 计算并交手续费
        uint256 fee = router.getFee(destChainSelector, message);
        require(address(this).balance >= fee, "Fee not enough");

// 3. 发送
        msgId = router.ccipSend{value: fee}(destChainSelector, message);
        emit CCIPSendRequested(msgId, amount);
        return msgId;
    }

receive() external payable {}
}
```
* ### DestinationMinter合约
```
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {CCIPReceiver} from "@chainlink/contracts-ccip/contracts/applications/CCIPReceiver.sol";
import {Client} from "@chainlink/contracts-ccip/contracts/libraries/Client.sol";
import "./Token4.sol";
contract DestinationMinter is CCIPReceiver {
    MyToken4 public token;
    event MintedByCCIP(address to, uint256 amount);

constructor(address _router, address _token) CCIPReceiver(_router) {
        token = MyToken4(_token);
    }

/**
     * CCIP 回调：只有路由器能调
     */
    function _ccipReceive(Client.Any2EVMMessage memory message)
        internal
        override
    {
        // 解码 (address to, uint256 amount)
        (address to, uint256 amount) =
            abi.decode(message.data, (address, uint256));
        token.mint(to, amount);
        emit MintedByCCIP(to, amount);
    }
}
```
**编译指令**：**npx hardhat compile**
# 测试合约
### 说明：本地双链部署 → 用户锁仓发事件 → 路由器 impersonate 转发 → 目标链铸币 → 余额断言
```
const { expect } = require("chai");
const { ethers, deployments } = require("hardhat");

describe("CrossChain mint via CCIP (MockRouter)", function () {
  this.timeout(120000);

const amount = 123;
  let srcMinter, dstMinter, token, router;
  let deployer, user;

beforeEach(async () => {
    [deployer, user] = await ethers.getSigners();
    await deployments.fixture(["token4", "SourceMinter", "DestinationMinter"]);
    const tokenAddress = await deployments.get("MyToken4");          // 存入资产        // 奖励代币（USDC）
        const routerAddress = await deployments.get("MockCCIPRouter");
        const srcMinterAddress = await deployments.get("SourceMinter");
        const dstMinterAddress = await deployments.get("DestinationMinter");
        token=await ethers.getContractAt("MyToken4", tokenAddress.address);
        router=await ethers.getContractAt("MockCCIPRouter", routerAddress.address);
        srcMinter=await ethers.getContractAt("SourceMinter", srcMinterAddress.address);
        dstMinter=await ethers.getContractAt("DestinationMinter", dstMinterAddress.address);
        console.log('token',token.address)
        console.log('router',router.target)
        // 授权铸币
        const role = await token.MINTER_ROLE();
        await token.grantRole(role, dstMinter.target);

// 预存手续费
        await deployer.sendTransaction({
            to: srcMinter.target,
            value: ethers.parseEther("1"),
        });
    
  })

it("user calls transferCrossChain on src", async () => {
    
    // console.log("------",await srcMinter.connect(user).transferCrossChain(amount))
    await expect(srcMinter.connect(user).transferCrossChain(amount))
      .to.emit(srcMinter, "CCIPSendRequested");
  });

it("simulate Router forwarding message to dst", async () => {
  const routerAddr = (await deployments.get("MockCCIPRouter")).address;
  const srcAddr    = (await deployments.get("SourceMinter")).address;

// 1. 硬hat 内置 impersonate
  await network.provider.send("hardhat_impersonateAccount", [routerAddr]);
  // 2. 给路由器补点余额（否则 gas 为 0）
  await network.provider.send("hardhat_setBalance", [
    routerAddr,
    "0x1000000000000000000", // 1 ETH
  ]);
  const routerSigner = await ethers.getSigner(routerAddr);

// 3. 构造消息
  const msg = {
    messageId: ethers.keccak256(ethers.toUtf8Bytes("mock")),
    sourceChainSelector: 1337,
    sender: ethers.zeroPadValue(srcAddr, 32), // 来源链上的 SourceMinter
    data: ethers.AbiCoder.defaultAbiCoder().encode(
      ["address", "uint256"],
      [user.address, amount]
    ),
    destTokenAmounts: [],
  };

// 4. 用路由器调 ccipReceive ✅
  await expect(dstMinter.connect(routerSigner).ccipReceive(msg))
    .to.emit(dstMinter, "MintedByCCIP")
    .withArgs(user.address, amount);

1.  **核心合约**：

-   **MyToken4**：AccessControl 管理多铸币者，支持任意地址一次性授权。
    -   **MockCCIPRouter**：用 `bytes` 绕过嵌套结构 7920 编译错误，提供 `ccipSend / getFee` 等完整接口。
    -   **SourceMinter**：用户入口，**锁仓 + 发事件 + 支付手续费**。
    -   **DestinationMinter**：继承 `CCIPReceiver`，**仅路由器地址**可触发 `_ccipReceive` 完成铸币。

1.  **测试亮点**：

-   `beforeEach` 使用 `deployments.fixture` 保证测试隔离；
    -   `hardhat_impersonateAccount + setBalance` 让 **路由器地址** 成为签名者，通过 `InvalidRouter` 校验；
    -   **事件断言 + 余额检查** 双保险，确保跨链铸币真正到账。

1.  **一键命令**：
    ```
    npx hardhat node --port 8545  # 链 A
    npx hardhat node --port 8546  # 链 B
    npx hardhat test test/CrossChain.js --network localA
    ```

三行即可在本地跑通 **完整 CCIP 跨链铸币**流程，**零测试网费用、零外部依赖**。

进一步优化： MockRouter 换成正式地址、把链 ID 换成测试网，同一套代码即可直接上 **Sepolia ↔ Mumbai** 实战。

前言

本文借助Hardhat + Chainlink CCIP 接口 + OpenZeppelin 搭建一条最小可运行的跨链铸币链路：

用户在源链调用 transferCrossChain 并支付手续费；

MockRouter 模拟 Chainlink 路由器完成费用计算与消息发出；

DestinationMinter（CCIPReceiver）在 目标链 接收消息并铸币；

全流程通过 本地双节点 + 双链部署 + 事件断言 验证，无需测试网 LINK 即可调试。

阅读完你将得到：
一套可复制的 Lock-Mint 跨链代码；

MockRouter 规避嵌套类型编译错误的技巧；

Hardhat 双链并发与 impersonate 测试方案；

可平滑迁移到 正式 CCIP Router 的接口兼容层。
前期准备

hardhat.config.js配置:主要针对network项的配置，便于本地跨链转账测试
核心代码配置
networks:{
hardhat: {
chainId: 1337,           // 节点将使用这个 id
},
localA: { url: "http://127.0.0.1:8545", chainId: 1337,  saveDeployments: true, },//src
localB: { url: "http://127.0.0.1:8546", chainId: 1338,  saveDeployments: true, },//dst
}
智能合约
代币合约
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol"; import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";

contract MyToken4 is ERC20, ERC20Burnable, AccessControl { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

constructor(
    string memory name_,
    string memory symbol_,
    address[] memory initialMinters   // 👈 部署时一次性给多地址授权
) ERC20(name_, symbol_) {
    // 部署者拥有 DEFAULT_ADMIN_ROLE（可继续授权/撤销）
    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);

    // 把 MINTER_ROLE 给所有传入地址
    for (uint256 i = 0; i &lt; initialMinters.length; ++i) {
        _grantRole(MINTER_ROLE, initialMinters[i]);
    }

    // 给部署者自己先发 1000 个
    _mint(msg.sender, 1000 * 10 ** decimals());
}

// 任何拥有 MINTER_ROLE 的人都能铸币
function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
    _mint(to, amount);
}

}

* ### MockCCIPRouter合约
  - **特别说明**:`保证本地部署的合约中包含MockCCIPRouter所有的方法，以及applyRampUpdates方法通过用 bytes 绕过嵌套类型命名`

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

import { IRouterClient } from "@chainlink/contracts-ccip/contracts/interfaces/IRouterClient.sol"; import { Client } from "@chainlink/contracts-ccip/contracts/libraries/Client.sol";

contract MockCCIPRouter is IRouterClient { uint256 public fee = 0.001 ether;

function ccipSend(uint64, Client.EVM2AnyMessage calldata)
    external
    payable
    override
    returns (bytes32)
{
    require(msg.value >= fee, "Insufficient fee");
    return keccak256(abi.encodePacked(msg.sender, block.timestamp));
}

function getFee(uint64, Client.EVM2AnyMessage calldata)
    external
    pure
    override
    returns (uint256)
{
    return 0.001 ether;
}

function isChainSupported(uint64) external pure override returns (bool) {
    return true;
}

function getSupportedTokens(uint64)
    external
    pure

    returns (address[] memory)
{
    return new address[](0);
}

function getPool(uint64, address) external pure  returns (address) {
    return address(0);
}

// ✅ 用 bytes 绕过嵌套类型命名
function applyRampUpdates(
    bytes calldata,
    bytes calldata,
    bytes calldata
) external pure  {}

}

* ### SourceMinter合约

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

import {IRouterClient} from "@chainlink/contracts-ccip/contracts/interfaces/IRouterClient.sol"; import {Client} from "@chainlink/contracts-ccip/contracts/libraries/Client.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/access/Ownable.sol";

contract SourceMinter is Ownable { IRouterClient public router; uint64 public destChainSelector; // 1338 address public destMinter; // 目标链 DestinationMinter 地址

event CCIPSendRequested(bytes32 msgId, uint256 amount);

constructor(address _router, uint64 _destChainSelector, address _destMinter,address _owner) Ownable(_owner) {
    router = IRouterClient(_router);
    destChainSelector = _destChainSelector;
    destMinter = _destMinter;
}

/**
 * 用户入口：锁定 amount 个 Link，发起 CCIP 跨链转账
 */
function transferCrossChain(uint256 amount) external returns (bytes32 msgId) {
    // 1. 构造 CCIP 消息
    Client.EVM2AnyMessage memory message = Client.EVM2AnyMessage({
        receiver: abi.encode(destMinter),
        data: abi.encode(msg.sender, amount), // 把 (to,amount) 发到对端
        tokenAmounts: new Client.EVMTokenAmount[](0), // 本例不直接搬 token，只发消息
        extraArgs: "",
        feeToken: address(0) // 用原生币付 CCIP 手续费；也可填 LINK
    });

    // 2. 计算并交手续费
    uint256 fee = router.getFee(destChainSelector, message);
    require(address(this).balance >= fee, "Fee not enough");

    // 3. 发送
    msgId = router.ccipSend{value: fee}(destChainSelector, message);
    emit CCIPSendRequested(msgId, amount);
    return msgId;
}

receive() external payable {}

}

* ### DestinationMinter合约

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

import {CCIPReceiver} from "@chainlink/contracts-ccip/contracts/applications/CCIPReceiver.sol"; import {Client} from "@chainlink/contracts-ccip/contracts/libraries/Client.sol"; import "./Token4.sol"; contract DestinationMinter is CCIPReceiver { MyToken4 public token; event MintedByCCIP(address to, uint256 amount);

constructor(address _router, address _token) CCIPReceiver(_router) {
    token = MyToken4(_token);
}

/**
 * CCIP 回调：只有路由器能调
 */
function _ccipReceive(Client.Any2EVMMessage memory message)
    internal
    override
{
    // 解码 (address to, uint256 amount)
    (address to, uint256 amount) =
        abi.decode(message.data, (address, uint256));
    token.mint(to, amount);
    emit MintedByCCIP(to, amount);
}

}

**编译指令**：**npx hardhat compile**
# 测试合约
### 说明：本地双链部署 → 用户锁仓发事件 → 路由器 impersonate 转发 → 目标链铸币 → 余额断言

const { expect } = require("chai"); const { ethers, deployments } = require("hardhat");

describe("CrossChain mint via CCIP (MockRouter)", function () { this.timeout(120000);

const amount = 123; let srcMinter, dstMinter, token, router; let deployer, user;

beforeEach(async () => { [deployer, user] = await ethers.getSigners(); await deployments.fixture(["token4", "SourceMinter", "DestinationMinter"]); const tokenAddress = await deployments.get("MyToken4"); // 存入资产 // 奖励代币（USDC） const routerAddress = await deployments.get("MockCCIPRouter"); const srcMinterAddress = await deployments.get("SourceMinter"); const dstMinterAddress = await deployments.get("DestinationMinter"); token=await ethers.getContractAt("MyToken4", tokenAddress.address); router=await ethers.getContractAt("MockCCIPRouter", routerAddress.address); srcMinter=await ethers.getContractAt("SourceMinter", srcMinterAddress.address); dstMinter=await ethers.getContractAt("DestinationMinter", dstMinterAddress.address); console.log('token',token.address) console.log('router',router.target) // 授权铸币 const role = await token.MINTER_ROLE(); await token.grantRole(role, dstMinter.target);

    // 预存手续费
    await deployer.sendTransaction({
        to: srcMinter.target,
        value: ethers.parseEther("1"),
    });

})

it("user calls transferCrossChain on src", async () => {

// console.log("------",await srcMinter.connect(user).transferCrossChain(amount))
await expect(srcMinter.connect(user).transferCrossChain(amount))
  .to.emit(srcMinter, "CCIPSendRequested");

});

it("simulate Router forwarding message to dst", async () => { const routerAddr = (await deployments.get("MockCCIPRouter")).address; const srcAddr = (await deployments.get("SourceMinter")).address;

// 1. 硬hat 内置 impersonate await network.provider.send("hardhat_impersonateAccount", [routerAddr]); // 2. 给路由器补点余额（否则 gas 为 0） await network.provider.send("hardhat_setBalance", [ routerAddr, "0x1000000000000000000", // 1 ETH ]); const routerSigner = await ethers.getSigner(routerAddr);

// 3. 构造消息 const msg = { messageId: ethers.keccak256(ethers.toUtf8Bytes("mock")), sourceChainSelector: 1337, sender: ethers.zeroPadValue(srcAddr, 32), // 来源链上的 SourceMinter data: ethers.AbiCoder.defaultAbiCoder().encode( ["address", "uint256"], [user.address, amount] ), destTokenAmounts: [], };

// 4. 用路由器调 ccipReceive ✅ await expect(dstMinter.connect(routerSigner).ccipReceive(msg)) .to.emit(dstMinter, "MintedByCCIP") .withArgs(user.address, amount);

const bal = await token.balanceOf(user.address); console.log(bal) expect(bal).to.equal(amount); }); });

# 部署合约
   - ### 代币部署

-  ### DestinationMinter部署

module.exports = async ({getNamedAccounts,deployments})=>{ const getNamedAccount = (await getNamedAccounts()).firstAccount; const secondAccount= (await getNamedAccounts()).secondAccount; console.log('secondAccount',secondAccount) const {deploy,log} = deployments; const MyAsset = await deployments.get("MyToken4"); console.log('MyAsset',MyAsset.address) const MockCCIPRouter=await deploy("MockCCIPRouter",{ from:getNamedAccount, args: [],//参数 log: true, }) console.log("MockCCIPRouter 合约地址:", MockCCIPRouter.address); //执行DestinationMinter部署合约 const DestinationMinter=await deploy("DestinationMinter",{ from:getNamedAccount, args: [MockCCIPRouter.address,MyAsset.address],//参数 picc路由,资产地址 log: true, }) console.log('DestinationMinter 合约地址',DestinationMinter.address) // const SourceMinter=await deploy("SourceMinter",{ // from:getNamedAccount, // args: [MockCCIPRouter.address,1337,DestinationMinter.address,getNamedAccount],//参数 picc路由,链id（1337）,目标dis,资产地址 // log: true, // }) // // await hre.run("verify:verify", { // // address: TokenC.address, // // constructorArguments: [TokenName, TokenSymbol], // // }); // console.log('SourceMinter 合约地址',SourceMinter.address) } module.exports.tags = ["all", "DestinationMinter"];

-  ### SourceMinter部署

module.exports = async ({getNamedAccounts,deployments})=>{ const getNamedAccount = (await getNamedAccounts()).firstAccount; const secondAccount= (await getNamedAccounts()).secondAccount; console.log('getNamedAccount-----',getNamedAccount) console.log('secondAccount',secondAccount) const {deploy,log} = deployments; const MyAsset = await deployments.get("MyToken4"); console.log('MyAsset',MyAsset.address) //执行MockCCIPRouter部署合约 const MockCCIPRouter=await deploy("MockCCIPRouter",{ from:getNamedAccount, args: [],//参数 log: true, }) console.log("MockCCIPRouter 合约地址:", MockCCIPRouter.address); //执行DestinationMinter部署合约 const DestinationMinter=await deploy("DestinationMinter",{ from:getNamedAccount, args: [MockCCIPRouter.address,MyAsset.address],//参数 picc路由,资产地址 log: true, }) console.log('DestinationMinter 合约地址',DestinationMinter.address) const SourceMinter=await deploy("SourceMinter",{ from:getNamedAccount, args: [MockCCIPRouter.address,1337,DestinationMinter.address,getNamedAccount],//参数 picc路由,链id（1337）,目标dis,资产地址 log: true, }) // await hre.run("verify:verify", { // address: TokenC.address, // constructorArguments: [TokenName, TokenSymbol], // }); console.log('SourceMinter 合约地址',SourceMinter.address) } module.exports.tags = ["all", "SourceMinter"];

# 测试步骤
  1. **启动第一条链：npx hardhat node --port 8545**
  2. **启动第一条链：npx hardhat node --port 8546**
  3. **测试脚本：npx hardhat test test/CrossChain.js --network localA**
# 总结
1.  **环境**：两条本地链（1337 / 1338）并行运行，Hardhat 部署脚本一次性完成跨链合约初始化。

1.  **核心合约**：

    -   **MyToken4**：AccessControl 管理多铸币者，支持任意地址一次性授权。
    -   **MockCCIPRouter**：用 `bytes` 绕过嵌套结构 7920 编译错误，提供 `ccipSend / getFee` 等完整接口。
    -   **SourceMinter**：用户入口，**锁仓 + 发事件 + 支付手续费**。
    -   **DestinationMinter**：继承 `CCIPReceiver`，**仅路由器地址**可触发 `_ccipReceive` 完成铸币。

1.  **测试亮点**：

    -   `beforeEach` 使用 `deployments.fixture` 保证测试隔离；
    -   `hardhat_impersonateAccount + setBalance` 让 **路由器地址** 成为签名者，通过 `InvalidRouter` 校验；
    -   **事件断言 + 余额检查** 双保险，确保跨链铸币真正到账。

1.  **一键命令**：

npx hardhat node --port 8545  # 链 A
npx hardhat node --port 8546  # 链 B
npx hardhat test test/CrossChain.js --network localA
```

三行即可在本地跑通 **完整 CCIP 跨链铸币**流程，**零测试网费用、零外部依赖**。

进一步优化： MockRouter 换成正式地址、把链 ID 换成测试网，同一套代码即可直接上 Sepolia ↔ Mumbai 实战。

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标签: 跨链转移 Chainlink CCIP Open Zeppelin Solidity

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React Native DApp 开发全栈实战·从 0 到 1 系列（跨链转账-合约部分）

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