secp256k1 curve and algorithm registered for JOSE use

IANA has registered the "secp256k1" elliptic curve in the JSON Web Key Elliptic Curve<https://www.iana.org/assignments/jose/jose.xhtml#web-key-elliptic-curve> registry and the corresponding "ES256K" signing algorithm in the JSON Web Signature and Encryption Algorithms<https://www.iana.org/assignments/jose/jose.xhtml#web-signature-encryption-algorithms> registry.  This curve is widely used among blockchain and decentralized identity implementations.

The registrations were specified by the COSE and JOSE Registrations for WebAuthn Algorithms<https://tools.ietf.org/html/draft-ietf-cose-webauthn-algorithms-06> specification, which was created by the W3C Web Authentication working group<https://www.w3.org/Webauthn/> and the IETF COSE working group<https://datatracker.ietf.org/group/cose/about/> because WebAuthn<https://www.w3.org/TR/webauthn/> also allows the use of secp256k1.  This specification is now in IETF Last Call.  The corresponding COSE registrations will occur after the specification becomes an RFC.

                                                       -- Mike

P.S.  This notice was also published at https://self-issued.info/?p=2093 and as @selfissued<https://twitter.com/selfissued>.