Create CrossChainBridge.sol

coin/QuantumCoin/smart_contracts/CrossChainBridge.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract CrossChainBridge is Ownable {
+    // Event emitted when assets are locked
+    event AssetsLocked(address indexed sender, uint256 amount, string destinationChain);
+
+    // Event emitted when assets are minted on the destination chain
+    event AssetsMinted(address indexed recipient, uint256 amount, string sourceChain);
+
+    // Mapping to track locked assets
+    mapping(address => uint256) public lockedAssets;
+
+    // Lock assets on the source chain
+    function lockAssets(address token, uint256 amount, string memory destinationChain) external {
+        require(amount > 0, "Amount must be greater than zero");
+
+        // Transfer tokens to this contract
+        IERC20(token).transferFrom(msg.sender, address(this), amount);
+
+        // Update locked assets
+        lockedAssets[token] += amount;
+
+        emit AssetsLocked(msg.sender, amount, destinationChain);
+    }
+
+    // Mint equivalent assets on the destination chain
+    function mintAssets(address recipient, uint256 amount, string memory sourceChain) external onlyOwner {
+        require(amount > 0, "Amount must be greater than zero");
+
+        // Mint new tokens to the recipient
+        // This function should be implemented in the token contract
+        // Example: IERC20(token).mint(recipient, amount);
+
+        emit AssetsMinted(recipient, amount, sourceChain);
+    }
+
+    // Withdraw locked assets (only for owner)
+    function withdrawLockedAssets(address token, uint256 amount) external onlyOwner {
+        require(lockedAssets[token] >= amount, "Insufficient locked assets");
+
+        lockedAssets[token] -= amount;
+        IERC20(token).transfer(msg.sender, amount);
+    }
+}