Create DID.sol

blockchain_integration/pi_network/decentralized_identity/DID.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract DecentralizedIdentity {
+    struct Identity {
+        string name;
+        string email;
+        bool exists;
+    }
+
+    mapping(address => Identity) private identities;
+
+    event IdentityRegistered(address indexed user, string name, string email);
+    event IdentityUpdated(address indexed user, string name, string email);
+
+    // Register a new identity
+    function registerIdentity(string memory _name, string memory _email) public {
+        require(!identities[msg.sender].exists, "Identity already exists.");
+        identities[msg.sender] = Identity(_name, _email, true);
+        emit IdentityRegistered(msg.sender, _name, _email);
+    }
+
+    // Update existing identity
+    function updateIdentity(string memory _name, string memory _email) public {
+        require(identities[msg.sender].exists, "Identity does not exist.");
+        identities[msg.sender].name = _name;
+        identities[msg.sender].email = _email;
+        emit IdentityUpdated(msg.sender, _name, _email);
+    }
+
+    // Retrieve identity information
+    function getIdentity(address _user) public view returns (string memory, string memory) {
+        require(identities[_user].exists, "Identity does not exist.");
+        return (identities[_user].name, identities[_user].email);
+    }
+
+    // Check if identity exists
+    function identityExists(address _user) public view returns (bool) {
+        return identities[_user].exists;
+    }
+}