Building a Privacy-First URL Shortener on Blockchain

说明与用途

构建了一个隐私优先的 URL 缩短器，客户端加密链接，存储在 Cronos 区块链上，浏览器本地解密，消除了服务器端跟踪和单点故障。

问题

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

结果

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.

工作流

• 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.

证据

Encrypted URL stored on Cronos blockchain

来源

Server never sees destination

来源