Update PiUSD.sol

blockchain_integration/pi_network/pi-stablecoin/contracts/PiUSD.sol

@@ -5,34 +5,10 @@ import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/Saf
 contract PiUSD {
     using SafeMath for uint256;
 
-    // Mapping of user addresses to PiUSD token balances
-    mapping (address => uint256) public balances;
-
-    // Mapping of user addresses to collateral balances
-    mapping (address => uint256) public collateral;
-
     // Total supply of PiUSD tokens
-    uint256 public totalSupply;
-
-    // Interest rate (in basis points)
-    uint256 public interestRate;
-
-    // Event emitted when PiUSD tokens are minted
-    event Mint(address indexed user, uint256 amount);
-
-    // Event emitted when PiUSD tokens are burned
-    event Burn(address indexed user, uint256 amount);
-
-    // Event emitted when collateral is deposited
-    event Deposit(address indexed user, uint256 amount);
-
-    // Event emitted when collateral is withdrawn
-    event Withdrawal(address indexed user, uint256 amount);
+    uint256 public totalSupply = 100000000; // 100 million tokens
 
-    // Event emitted when the interest rate is updated
-    event InterestRateUpdated(uint256 newInterestRate);
-
-    // Function to mint PiUSD tokens
+    // Token distribution mechanism: minting and burning
     function mint(uint256 amount) public {
         // Check if the user has sufficient collateral
         require(collateral[msg.sender] >= amount, "Insufficient collateral");
@@ -45,7 +21,6 @@ contract PiUSD {
         emit Mint(msg.sender, amount);
     }
 
-    // Function to burn PiUSD tokens
     function burn(uint256 amount) public {
         // Check if the user has sufficient PiUSD tokens
         require(balances[msg.sender] >= amount, "Insufficient PiUSD tokens");
@@ -58,36 +33,38 @@ contract PiUSD {
         emit Burn(msg.sender, amount);
     }
 
-    // Function to deposit collateral
-    function deposit(uint256 amount) public {
-        // Update the user's collateral balance
-        collateral[msg.sender] = collateral[msg.sender].add(amount);
+    // Interest rate mechanism: fixed interest rate
+    uint256 public interestRate = 5; // 5% annual interest rate
 
-        // Emit the Deposit event
-        emit Deposit(msg.sender, amount);
-    }
+    // Collateral requirements for minting and borrowing PiUSD tokens
+    uint256 public collateralRequirement = 150; // 150% collateral requirement
 
-    // Function to withdraw collateral
-    function withdraw(uint256 amount) public {
-        // Check if the user has sufficient collateral
-        require(collateral[msg.sender] >= amount, "Insufficient collateral");
+    // Reserve requirements for PiUSD token holders
+    uint256 public reserveRequirement = 20; // 20% reserve requirement
+
+    // Price stabilization mechanism: rebasing
+    function rebase() public {
+        // Calculate the new total supply based on the interest rate
+        uint256 newTotalSupply = totalSupply.mul(interestRate).div(100);
 
-        // Update the user's collateral balance
-        collateral[msg.sender] = collateral[msg.sender].sub(amount);
+        // Update the total supply
+        totalSupply = newTotalSupply;
 
-        // Emit the Withdrawal event
-        emit Withdrawal(msg.sender, amount);
+        // Emit the Rebase event
+        emit Rebase(newTotalSupply);
     }
 
-    // Function to update the interest rate
-    function updateInterestRate(uint256 newInterestRate) public {
-        // Check if the user is authorized to update the interest rate
+    // Governance model: decentralized governance
+    address public governanceAddress;
+
+    function updateGovernanceAddress(address newGovernanceAddress) public {
+        // Check if the user is authorized to update the governance address
         require(msg.sender == governanceAddress, "Unauthorized access");
 
-        // Update the interest rate
-        interestRate = newInterestRate;
+        // Update the governance address
+        governanceAddress = newGovernanceAddress;
 
-        // Emit the InterestRateUpdated event
-        emit InterestRateUpdated(newInterestRate);
+        // Emit the GovernanceUpdated event
+        emit GovernanceUpdated(newGovernanceAddress);
     }
 }