They're comfortable and lightweight, though the USB-C tether can be annoying.
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.
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Над российским курортным городом раздалась серия взрывовShot: Над Сочи раздалась новая серия взрывов，详情可参考PDF资料
OAuth2 authentication: