The LEADict's OpenID Connect authorization server (MITRE's OpenID Connect reference implemementation).
https://id.leadict.com/
https://leadict.com/.well-known/openid-configuration
My webfinger:
https://leadict.com/.well-known/webfinger?resource=acct:zboran@leadict.com
with "rel" filter
https://leadict.com/.well-known/webfinger?resource=acct:zboran@leadict.com&rel=http://openid.net/specs/connect/1.0/issuer