Trust tokens enable an origin to issue cryptographic tokens to a user it trusts. The tokens are stored by the user's browser. The browser can then use the tokens in other contexts to evaluate the user's authenticity.
The Trust Token API enables trust of a user in one context to be conveyed to another context without identifying the user or linking the two identities.
You can try out Trust Tokens with our demo and, from Chrome 89, inspect Trust Tokens in the Chrome DevTools Network and Application tabs.
The Privacy Sandbox is a series of proposals to satisfy third-party use cases without third-party cookies or other tracking mechanisms. See Digging into the Privacy Sandbox for an overview of all the proposals.
The web needs ways to establish trust signals which show that a user is who they say they are, and not a bot pretending to be a human, or a malicious third-party defrauding a real person or service. Fraud protection is particularly important for advertisers, ad providers, and CDNs.
Unfortunately, many existing mechanisms to gauge and propagate trustworthiness—to work out if an interaction with a site is from a real human, for example—take advantage of techniques that can also be used for fingerprinting.