Google Chrome announced earlier this year that it would phase out supporting third-party cookies for two years. Google says it wants to develop alternative tools to “maintain ad-supported web” to “make third-party cookies obsolete” within two years. Now Google has taken a big step toward steaming a project that has begun testing “trust tokens” with developers, with plans to start field testing soon.
The technical specifications and APIs for the trust token are published on GitHub. Trust tokens take advantage of blind signatures and zero-knowledge proofs, have shorter lifetimes, are less durable than cookies, and provide very limited identifyal data. The specification is still in the early stages of implementation.