Japanese government went live with OpenID/AB
Japanese government went live with OpenID Artifact Binding (AB) draft07. It uses usual OpenID 2.0 to connect to major OpenID providers and uses AB to connect among government agencies.
https://openlabs.go.jp/

About The Author
Having been working on Digital Identity since 2000.
Co-author of various identity related specifications like OpenID Connect, JSON Web Token.
Chair of the OpenID Foundation (2011-)
Vice Chair of the OpenID Foundation (2010),
Founder of OpenID Foundation Japan (2008-),
Trustee of Kantara Initiative (2009-).