Contact emails
[email protected], [email protected], [email protected], 
[email protected], [email protected]


Explainer
https://github.com/explainers-by-googlers/private-verification-tokens


Specification
No information provided


Design docs

https://github.com/explainers-by-googlers/private-verification-tokens


Summary
Automated traffic is increasing across the web, and many websites have 
responded with more user friction in the form of CAPTCHAs and other challenges 
to combat unwanted traffic. This degrades the web user experience for all 
users, with a particularly outsized impact to users in private browsing modes. 
Private Verification Tokens (PVT) is a low entropy mechanism that allows 
websites to transfer the trust that their users have established in regular 
browsing into private browsing mode to reduce their experienced user friction. 
PVTs are issued during a regular browsing session and redeemed in private 
browsing mode.


Blink component
Blink


Web Feature ID
Missing feature


TAG review
No information provided


TAG review status
Pending


Goals for experimentation
The experiment aims to verify whether positive reputation built up by a user on 
a particular website in regular browsing mode can be used to earn a lower 
friction experience on the same website when in private browsing mode. Over the 
course of the experiment, we expect participants to iterate on their 
methodology for token issuance, and validate the correlation of positive 
reputation carried into private browsing mode with existing signals indicating 
benign (ie non-abusive usage). The ultimate goal would be to reduce friction 
for users with positive reputation available, but for the experiment, we expect 
to validate the usefulness of the signal in aiding bot detection defenses.


Origin Trial documentation link
https://github.com/explainers-by-googlers/private-verification-tokens


Risks




Interoperability and Compatibility
No information provided

Gecko: No signal We have not yet officially requested a signal from Firefox 
yet, but we expect it to be negative based on conversations in standards groups 
like the W3C Anti-Fraud Community Group. We will formally request their review 
based on the outcome of the experiment. Bot detection is an ambiguous space, 
and there are multiple solutions and ideas that have been tried before, and 
some that are under active discussion in standards bodies. PVTs tackles a 
scoped version of the broader problem with simpler properties, and we think 
it's worth experimenting with to see how our design will perform in practice.

WebKit: No signal

Web developers: No signals

Other signals:


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?
No



Ongoing technical constraints
None


Debuggability
None


Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, 
ChromeOS, Android, and Android WebView)?
No
No webview support.


Is this feature fully tested by web-platform-tests?
No



Flag name on about://flags
kEnablePrivateVerificationTokens


Finch feature name
kEnablePrivateVerificationTokens


Requires code in //chrome?
True


Tracking bug
https://crbug.com/500396188


Launch bug
https://launch.corp.google.com/launch/4465636


Estimated milestones


Origin trial desktop first 154

Origin trial desktop last 165

Origin trial Android first 154

Origin trial Android last 165




Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6210457816924160?gate=6479261834805248


Links to previous Intent discussions
Intent to Prototype: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69d805cc.050a0220.1c79a0.1052.GAE%40google.com



This intent message was generated by Chrome Platform Status.

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