Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создана приватная система сокращения URL, использующая клиентское шифрование и хранение зашифрованных ссылок в блокчейне Cronos, чтобы предотвратить отслеживание и утечку данных.

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

Cryptly provides a privacy‑first URL shortener that never exposes destination URLs to servers, removes centralized tracking, and leverages blockchain for immutable, 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 endpoint.
• Worker writes the ciphertext to the Cronos blockchain via a smart contract.
• When a user clicks the short link, the Worker fetches the ciphertext from the blockchain.
• The browser decrypts the ciphertext locally and redirects to the original URL.
• The server never sees the plaintext URL or user metadata.

Доказательства

Bit.ly logs your IP, timestamp, user agent

Источник

Encrypted URL stored on Cronos blockchain

Источник