Spells a key confirmation as a string (jkt:, x5t: or kid:), shared by the macaroon caveat and the zcap term.
jkt:
x5t:
kid:
the confirmation
the string, or null for a bearer token
Spells a key confirmation as a string (
jkt:,x5t:orkid:), shared by the macaroon caveat and the zcap term.