Google is testing Web Bot Auth, an experimental protocol designed to help websites verify that automated traffic is really coming from the bot or service it claims to represent. The new protocol could give site owners a dependable way to separate legitimate automated traffic from bots that hide or misrepresent who they are.

A new developer support page was published provide information on how to verify requests with the Web Bot Auth protocol, which is currently in an experimental phase.

What Google’s Web Bot Auth Is Based On

The new protocol is technically called the HTTP Message Signatures Directory. It’s a proposed technical standard designed to automate trust between web services. It helps websites recognize verified automated services without requiring each side to manually exchange security keys beforehand.

The basic idea is similar to giving verified automated services a standardized way to present credentials. Instead of relying only on names, user-agent strings, or private setup between companies, the protocol gives websites a repeatable way to check whether an automated request can be verified. That matters because many bots can claim to be something they are not. Web Bot Auth does not decide whether a bot is good or bad, but it can give site owners a stronger signal about whether the bot is really the service it claims to be.

A Reliable Way To Identify Bots

The cryptographic part is important because it makes identity harder to fake. Today, a rogue bot can claim to be a legitimate crawler by copying a name or user-agent string. Web Bot Auth is designed to move beyond that kind of self-identification by giving websites a way to check whether an automated request matches the service’s cryptographic credentials.

Under this protocol, a bot would need more than a label saying who it is. It would need to prove that identity in a way that a website can validate. That could give site owners a secure basis for allowing verified automated services while blocking bots that cannot prove who they are. The protocol does not automatically decide which bots should be allowed or blocked, but it could give websites a more dependable signal for making that decision.

Cryptographic verification is what makes Web Bot Auth better than current bot identification methods. Instead of relying on signals that can be misrepresented, it gives websites a way to verify automated requests. That means recognition is based less on what a bot says about itself and more on whether its identity can be confirmed by cryptographic credentials.

Caveat: It’s In An Experimental Phase

The proposed protocol will make it possible to distinguish between rogue bots that are impersonating trusted crawlers from the genuine bots from trusted services. This protocol is like a whitelist of what’s allowed which may make it easier to isolate untrusted crawlers.

However, because this is an experimental phase, the “whitelist” currently only applies to a subset of traffic,…


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Last Update: May 5, 2026