ObsidianDragon - DragonX ImGui Wallet

Full-node GUI wallet for DragonX cryptocurrency.
Built with Dear ImGui, SDL3, and OpenGL3/DX11.

Features:
- Send/receive shielded and transparent transactions
- Autoshield with merged transaction display
- Built-in CPU mining (xmrig)
- Peer management and network monitoring
- Wallet encryption with PIN lock
- QR code generation for receive addresses
- Transaction history with pagination
- Console for direct RPC commands
- Cross-platform (Linux, Windows)

src/data/address_book.h

@@ -0,0 +1,103 @@
+// DragonX Wallet - ImGui Edition
+// Copyright 2024-2026 The Hush Developers
+// Released under the GPLv3
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+namespace dragonx {
+namespace data {
+
+/**
+ * @brief A single address book entry
+ */
+struct AddressBookEntry {
+    std::string label;
+    std::string address;
+    std::string notes;
+    
+    AddressBookEntry() = default;
+    AddressBookEntry(const std::string& l, const std::string& a, const std::string& n = "")
+        : label(l), address(a), notes(n) {}
+};
+
+/**
+ * @brief Address book manager
+ * 
+ * Stores labeled addresses for easy access when sending.
+ */
+class AddressBook {
+public:
+    AddressBook();
+    ~AddressBook();
+
+    /**
+     * @brief Load address book from disk
+     * @return true if loaded successfully
+     */
+    bool load();
+
+    /**
+     * @brief Save address book to disk
+     * @return true if saved successfully
+     */
+    bool save();
+
+    /**
+     * @brief Get default address book file path
+     */
+    static std::string getDefaultPath();
+
+    /**
+     * @brief Add a new entry
+     * @param entry The entry to add
+     * @return true if added (false if duplicate address)
+     */
+    bool addEntry(const AddressBookEntry& entry);
+
+    /**
+     * @brief Update an existing entry
+     * @param index Index of entry to update
+     * @param entry New entry data
+     * @return true if updated
+     */
+    bool updateEntry(size_t index, const AddressBookEntry& entry);
+
+    /**
+     * @brief Remove an entry
+     * @param index Index of entry to remove
+     * @return true if removed
+     */
+    bool removeEntry(size_t index);
+
+    /**
+     * @brief Find entry by address
+     * @param address Address to search for
+     * @return Index or -1 if not found
+     */
+    int findByAddress(const std::string& address) const;
+
+    /**
+     * @brief Get all entries
+     */
+    const std::vector<AddressBookEntry>& entries() const { return entries_; }
+
+    /**
+     * @brief Get entry count
+     */
+    size_t size() const { return entries_.size(); }
+
+    /**
+     * @brief Check if empty
+     */
+    bool empty() const { return entries_.empty(); }
+
+private:
+    std::vector<AddressBookEntry> entries_;
+    std::string file_path_;
+};
+
+} // namespace data
+} // namespace dragonx