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，客户端加密链接后将密文存储在 Cronos 区块链上，服务器无法看到目标地址，提升了隐私和抗攻击能力。

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 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.

工作流

• 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.

证据

Encrypted URL stored on Cronos blockchain

来源

Server never sees destination

来源