Private Proof API

[arichiv]

WebKittens

No response

Title of the proposal

Private Proof API

URL to the explainer

https://explainers-by-googlers.github.io/private-proof/

URL to the explainer's repository

https://github.com/explainers-by-googlers/private-proof

Issue Tracker URL

https://issues.chromium.org/404546887

Chrome Status URL

https://chromestatus.com/feature/4848107667587072

TAG Design Review URL

https://github.com/w3ctag/design-reviews/issues/1071

Mozilla standards-positions issue URL

https://github.com/mozilla/standards-positions/issues/1196

Description

This API uses Zero-Knowledge Proofs (ZKPs) to allow analysis of potentially identifiable signals while providing only a limited verdict output. For example, it empowers anti-fraud services to verify whether a user possesses an unmodified stored timestamp older than some provided timestamp without disclosing any additional user data. This approach strikes a balance between user privacy and anti-fraud capabilities by enabling websites to request a reputation signal (such as profile age) on which the user agent can enforce meaningful privacy constraints, while making the signal useful enough to remove the need for other burdensome or invasive checks, and allowing the user to clear said signal at will.