Carl is a lightweight BitTorrent client with first-class Tor anonymity
Carl is a lightweight BitTorrent client designed to integrate with the Tor network, prioritizing user anonymity by routing all traffic through Tor.
Background
- BitTorrent is a peer-to-peer file-sharing protocol where users download files by swapping pieces directly with other users, not from a central server. It's commonly used for Linux ISOs and open-source software, but also for copyright infringement.
- Tor (The Onion Router) is an anonymity network that hides your IP address by routing traffic through multiple encrypted relay nodes. Running BitTorrent over Tor is notoriously risky — most clients leak your real IP via DNS queries, peer IDs, or direct connections that bypass Tor.
- Carl is a new, minimalist BitTorrent client written in Rust, explicitly designed to route all traffic through Tor safely. Its name is a play on "Swiss Army Knife" — it does one thing well.
- Most existing clients (qBittorrent, Transmission, μTorrent) lack native Tor integration; setting them up for anonymity requires complex manual configuration that still risks leaks.
- Author Vincenzo Palazzo is an open-source developer; Carl addresses the longstanding challenge of truly anonymous torrenting without needing expert network tinkering.