Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создано приватное сокращение URL, где данные шифруются на клиенте, хранятся на блокчейне Cronos и расшифровываются в браузере, устраняя сбор данных и уязвимости централизованных сервисов.

Задача

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

Результат

The system delivers a URL shortener that never sees destination URLs, removes tracking, and stores data on a tamper‑proof blockchain, providing privacy and censorship resistance.

Рабочий процесс

• 1. User enters a URL in the web interface.
• 2. Client‑side JavaScript generates a random IV and AES‑GCM key.
• 3. The URL is encrypted with Web Crypto API and the IV.
• 4. The encrypted payload is sent to a Cloudflare Worker.
• 5. The Worker writes the encrypted data to the Cronos blockchain via a transaction.
• 6. The Worker returns a short code derived from the transaction hash.
• 7. User shares the short link (e.g., https://cryptly.workers.dev/abc123).
• 8. When the link is visited, the Worker fetches the encrypted payload from the blockchain.
• 9. The browser decrypts the payload locally using the same key and IV.
• 10. The browser redirects to the original destination URL without exposing it to any server.

Доказательства

Encrypted URL stored on Cronos blockchain

Источник

Server never sees destination

Источник