Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создан приватный сокращатель URL, использующий клиентское шифрование и хранение зашифрованных ссылок в блокчейне Cronos, чтобы избежать сбора данных и уязвимостей централизованных сервисов.

Задача

Traditional URL shorteners log user data, track browsing patterns, and can be hacked, exposing sensitive information.

Результат

Cryptly provides a URL shortener that never exposes destination URLs to servers, offers censorship resistance, and eliminates a single point of failure.

Рабочий процесс

• 1. User enters a URL in the Cryptly web interface.
• 2. The browser generates a random IV and derives an 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 transaction.
• 5. The short link (blockchain transaction hash) is returned to the user.
• 6. When the short link is visited, the browser fetches the ciphertext from the blockchain.
• 7. The browser decrypts the ciphertext locally using the same key and IV, revealing the original URL.
• 8. The browser navigates to the decrypted URL without exposing it to any server.

Доказательства

Encrypted URL stored on Cronos blockchain

Источник

Server never sees destination

Источник