Architecture

Kastle is built with modern tools to ensure performance, security, and extensibility:

• wxt: A framework for building browser extensions with TypeScript, simplifying Chrome API integration.

• React: A component-based UI library for creating responsive, dynamic interfaces.

• Kaspa WASM: WebAssembly bindings for Kaspa’s core logic, enabling fast blockchain interactions (key generation, transaction signing) client-side.

• TypeScript: Type-safe codebase for reduced runtime errors.

• Vite: Bundling and development server for rapid iteration.

Components

1. Background Script (Service Worker)

   • Handles wallet initialization, key management.

   • Listens for API requests from websites and forwards them to the UI for user approval.

2. Content Script

   • Injects a window.kastle object into websites to enable dApp interactions.

   • Relays messages between websites and the background script.

3. UI Layer (React)

   • Popup: Quick access to balance, send/receive buttons, and network settings.

   • Options Page: Manage seed phrases, view addresses, and configure security.

   • Approval Dialogs: User prompts for transaction signing or dApp connections.

4. Kaspa WASM Module

   • Compiled Rust code for address derivation, and transaction signing.

5. Encrypted Storage

   • Securely stores private keys and wallet metadata using Chrome’s chrome.storage.local API.