Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создана система сокращения URL, где клиент шифрует ссылку, а сервер хранит только зашифрованные данные на блокчейне, обеспечивая конфиденциальность и устойчивость к взлому.

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 provides a privacy‑first URL shortener where the server never sees the destination URL, eliminating tracking and reducing the risk of data breaches, while leveraging blockchain for censorship‑resistant storage.

Рабочий процесс

• Generate a random IV and AES‑GCM key in the browser.
• Encrypt the destination URL with Web Crypto API.
• Send the ciphertext to a Cloudflare Worker.
• The Worker writes the ciphertext to the Cronos blockchain via an API call.
• When a user visits the short link, the Worker fetches the ciphertext from the blockchain.
• The browser decrypts the ciphertext locally using the same key and IV.
• The browser redirects to the original URL without exposing it to any server.

Доказательства

Encrypted URL stored on Cronos blockchain

Источник

Server never sees destination

Источник