Create ChannelValidator.sol

blockchain_integration/pi_network/pi-network-layer2-scaling/contracts/state-channels/ChannelValidator.sol

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "./StateChannel.sol";
+
+contract ChannelValidator {
+    event ChannelValidated(address indexed channel, address indexed participant);
+
+    function validateChannel(StateChannel _channel) external {
+        require(!_channel.isOpen(), "Channel is still open");
+        emit ChannelValidated(address(_channel), msg.sender);
+    }
+
+    function validateFinalBalances(StateChannel _channel, uint256 _finalBalanceA, uint256 _finalBalanceB) external {
+        require(!_channel.isOpen(), "Channel is still open");
+        require(_finalBalanceA + _finalBalanceB == address(_channel).balance, "Invalid final balances");
+        emit ChannelValidated(address(_channel), msg.sender);
+    }
+}