DCAPS Circuit - Sell Project

DCAPS Circuit is a working Windows desktop software platform for secure network access, built as a complete technological foundation for a subscription-based connectivity product. The project includes a Qt/C++ desktop client, a backend API, user authentication, email verification, subscription and traffic logic, automatic profile generation, a Windows installer, and a dedicated Windows service responsible for controlling the secure connection runtime. The system is not a visual prototype. It is already functional and demonstrates a full user flow: installation through a Windows setup package; account registration and email confirmation via a 6-digit code; login and access to a personal dashboard; trial subscription creation; display of subscription status, expiration date, traffic usage, and monthly analytics; automatic generation and refresh of connection profiles; secure connection launch in Proxy and TUN modes; automatic blocking of access when the subscription expires or traffic quota reaches zero; automatic revocation of active profiles when access becomes invalid. Core Components 1. Windows Desktop Client The client is developed in C++ / Qt Widgets and features a custom modern dark interface. It includes: authentication and registration screens; email verification flow; account and subscription dashboard; traffic analytics UI; profile management; Proxy/TUN mode selector; traffic rules and routing configuration screens; runtime logs and service diagnostics; system tray integration; custom dialogs and installer-ready UI flow. 2. Backend The backend manages: registration and authorization; email verification; user sessions; subscription lifecycle; traffic quotas; profile creation, refresh, and revocation; server-side validation before each connection; access blocking for expired subscriptions or depleted traffic; API endpoints used by the desktop client. 3. Secure Connection Runtime The product supports: system Proxy mode; TUN tunnel mode; Xray-based profile usage; tun2socks integration; route and DNS preparation for full tunnel behavior; service-controlled start/stop logic; protected runtime config transfer through IPC. 4. Client Protection / Integrity Layer A major part of the project is a custom security layer designed to make the desktop client significantly harder to tamper with: direct launch of the GUI can be blocked; startup is controlled through a bootstrap launcher; signed integrity manifests are verified before launch; signed backend trust policy files are used; anti-rollback counters prevent launching stale trusted bundles; runtime tree integrity is checked before launching connection components; Xray/TUN/system proxy operations are executed through a dedicated Windows service; the GUI does not write raw runtime session JSON to disk; stale or revoked backend profiles are not allowed to be reused from memory. 5. Installer & Delivery The project already includes a Windows installer build pipeline that: packages the desktop client and service; includes the required runtime components; builds signed manifests into the installer payload; installs and configures the Windows service; cleanly removes the application, service, runtime folders, and settings during uninstall. Current State The project is at a stage where it can be demonstrated as a real working product foundation, not just source code fragments. It is suitable for: acquisition as a ready-made software asset; further development into a commercial secure access service; white-label adaptation; integration into an existing networking, cybersecurity, or subscription-based software business. Technology Stack C++ / Qt Widgets FastAPI backend PostgreSQL Redis Alembic migrations Docker Compose Windows Service / IPC control layer Xray runtime integration TUN / tun2socks support SMTP email verification installer automation and integrity manifest signing What Is Included in the Sale The sale can include: full source code of the desktop client; full source code of the backend; installer scripts and packaging logic; service and bootstrap protection layer; manifest signing utilities; configuration examples; project documentation and explanation of the architecture; demonstration materials and handover guidance.