The reason we suggest restricting the use of GenericCallable to
Материалы по теме:，更多细节参见体育直播
Résumé/CV:，这一点在体育直播中也有详细论述
The User and Issuer now run the blind signing protocol described above — here the User sets its message to SN and the employs its signing key SK. At the end of this process the user will hold a valid signature by the issuer on the message SN. The pair (SN, signature) now form the credential.