VKontakteID = VKontakte + OpenID

The idea of ​​an OpenID provider based on the social network VKontakte, given its user base, has been wandering for a long time.

Its trial implementation was carried out back in 2008, as soon as the User API appeared. But, unfortunately, the project was not approved (not something that would be rejected, but simply ignored, I don’t know a single case of site approval based on the User API).

In connection with the recent appearance of the Open API, I decided to revive the project, especially every third comment was “why not a standard OpenID ?!”.
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So, on all sites that accept OpenID, it is enough to enter the address VKontakteID.ru and you will be identified with your VKontakte account. For obsolete OpenID 1.x consumers, enter the address VKontakteID.ru/idXXXXXX , where XXXXXX is your VK identifier. But such sites are already a minority.

Authentication is performed through the official Open API , the login and password are transmitted directly to the VKontakte servers, and if you are logged in there and you have cookies, you will not need to enter them at all.

PS Support SReg and AX (transfer of additional data about the user) yet.
PPS Support SReg and AX has already been added .
PPPS Also added support for OpenID Immediate Mode.