Create CarbonOffsetContract.sol

sidra_chain_integration/contracts/CarbonOffsetContract.sol

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+pragma solidity ^0.8.0;
+
+contract CarbonOffsetContract {
+    // Mapping of investors to their carbon credits
+    mapping (address => uint256) public carbonCredits;
+
+    // Function to purchase carbon credits
+    function purchaseCarbonCredits(uint256 amount) public {
+        // Verify the investor's identity and ensure they have sufficient funds
+        require(msg.sender != address(0), "Invalid investor");
+        require(msg.value >= amount, "Insufficient funds");
+
+        // Update the investor's carbon credits
+        carbonCredits[msg.sender] += amount;
+    }
+
+    // Function to verify and trade carbon credits
+    function verifyAndTradeCarbonCredits(uint256 amount) public {
+        // Verify the investor's identity and ensure they have sufficient carbon credits
+        require(msg.sender != address(0), "Invalid investor");
+        require(carbonCredits[msg.sender] >= amount, "Insufficient carbon credits");
+
+        // Update the investor's carbon credits and transfer the credits to the buyer
+        carbonCredits[msg.sender] -= amount;
+        carbonCredits[msg.sender] += amount;
+    }
+
+    // Function to retire carbon credits
+    function retireCarbonCredits(uint256 amount) public {
+        // Verify the investor's identity and ensure they have sufficient carbon credits
+        require(msg.sender != address(0), "Invalid investor");
+        require(carbonCredits[msg.sender] >= amount, "Insufficient carbon credits");
+
+        // Update the investor's carbon credits and retire the credits
+        carbonCredits[msg.sender] -= amount;
+    }
+
+    // Event to notify when carbon credits are purchased
+    event CarbonCreditsPurchased(address indexed investor, uint256 amount);
+
+    // Event to notify when carbon credits are traded
+    event CarbonCreditsTraded(address indexed investor, uint256 amount);
+
+    // Event to notify when carbon credits are retired
+    event CarbonCreditsRetired(address indexed investor, uint256 amount);
+}