This is the OPS-DIR review of -12
1)  "This specification introduces a new token called a cryptographic
   identifier (Crypto-ID) that is used to prove indirectly the ownership
   of an address that is being registered by means of [RFC8505]." 
during Neighbor Discovery in 
  "...a 6LoWPAN Low Power Lossy
   Network (LLN), typically a stub network connected to a larger IP
   network via a Border Router called a 6LBR per [RFC6775]."
2) This seems like a worthwhile update to RFC8505.
     The section describing the Update aspect is helpful, but ...
     Nit: there should also a sentence in the Abstract indicating the Update status.
     The scope of operation is very limited, hence no operational issues detected.
3) The SEC-DIR review will likely be more interesting: this reviewer's experience
    doesn't foster review of LLN in any depth.
4) The Doc Shepherd's form indicates that the last 4 versions benefited from review by
    knowledgeable persons in the Security Area.