Privacy Pass · Cloudflare Web Application Firewall (WAF) docs
Privacy Pass ↗ specifies an extensible protocol for creating and redeeming anonymous and transferable tokens. Its specification is maintained by the IETF. Cloudflare provides "Silk - Privacy Pass Client". This is a Chrome and Firefox browser extension used for research, which provides a better visitor experience for Cloudflare-protected websites. Privacy Pass is especially helpful for visitors from shared networks, VPNs, and Tor that tend to have poorer IP reputations.