I have spent a few days on reading white papers. I still can not find answers for the following questions.
How does an issuer sign credentials? The issuer attaches one digital signature for each attribute (in credential), or creates just one digital signature for one credential.
From Question 1, if there is only one digital signature for the credential, when a user combines verifiable claims from different credentials and sends them to the inspector, how can the inspector verify the verifiable claims?
How can the inspector know who issues claims? (i.e. does each verifiable claim need an issuer’s DID attached to it.)