Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создан приватный сокращатель URL, использующий клиентское шифрование и хранение на блокчейне Cronos, чтобы сервер не видел целевой адрес и не собирал данные пользователя.

Задача

Traditional URL shorteners log user data, track browsing patterns, and sell data, creating privacy risks and a single point of failure.

Результат

The system provides a privacy‑first URL shortener where the server never sees the destination URL, eliminates centralized data storage, and offers censorship resistance.

Рабочий процесс

• 1. User enters URL in the web form.
• 2. Client‑side JavaScript generates a random IV and AES‑GCM key.
• 3. The URL is encrypted with Web Crypto API and the ciphertext is sent to a Cloudflare Worker.
• 4. The Worker writes the ciphertext to the Cronos blockchain via a smart‑contract call.
• 5. The Worker returns a short code (hash) to the user.
• 6. When the short code is visited, the Worker fetches the ciphertext from the blockchain.
• 7. The browser decrypts the ciphertext locally using the stored key and redirects to the original URL.

Доказательства

Encrypted URL stored on Cronos blockchain

Источник

Server never sees destination

Источник