Today we’re announcing Private Access Tokens, a completely invisible, private way to validate that real users are visiting your site.| The Cloudflare Blog
See how Fastly worked with partners to improve Private Access Tokens and how developers can use Fastly to improve it.| www.fastly.com
This document specifies two variants of the the two-message issuance protocol for Privacy Pass tokens: one that produces tokens that are privately verifiable, and another that produces tokens that are publicly verifiable. The privately verifiable issuance protocol optionally supports public metadata during the issuance flow.| www.ietf.org