The Authentication Method Reference Values specification is now RFC 
8176<https://www.rfc-editor.org/rfc/rfc8176.txt>.  The abstract describes the 
specification as:

The amr (Authentication Methods References) claim is defined and registered in 
the IANA "JSON Web Token Claims" registry, but no standard Authentication 
Method Reference values are currently defined. This specification establishes a 
registry for Authentication Method Reference values and defines an initial set 
of Authentication Method Reference values.

The specification defines and registers some Authentication Method Reference 
values such as the following, which are already in use by some Google and 
Microsoft products and OpenID specifications:

  *   "face" - Facial recognition
  *   "fpt" - Fingerprint
  *   "hwk" - Proof-of-possession of a hardware-secured key
  *   "otp" - One-time password
  *   "pin" - Personal Identification Number
  *   "pwd" - Password
  *   "swk" - Proof-of-possession of a software-secured key
  *   "sms" - Confirmation using SMS
  *   "user" - User presence test
  *   "wia" - Windows Integrated Authentication
See https://www.iana.org/assignments/authentication-method-reference-values/ 
for the full list of registered values.

Thanks to Caleb Baker, Phil Hunt, Tony Nadalin, and William Denniss, all of 
whom substantially contributed to the specification.  Thanks also to the OAuth 
working group members, chairs, area directors, and other IETF members who 
helped refine the specification.

                                                                -- Mike

P.S.  This announcement was also posted at http://self-issued.info/?p=1701 and 
as @selfissued<https://twitter.com/selfissued>.

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