To “show” the credential to some Resource, the user simply needs to hand over the pair (SN, signature). Assuming the Resource knows the public key (PK) of the issuer, it can simply verify that (1) the signature is valid on SN, and (2) nobody has every used that value SN in some previous credential “show”.
行遍烟峦，历尽千帆；登高望远，大道无垠。
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### p(n) is hmac-sha256(key=secret, data=a(n)+seed)。关于这个话题，heLLoword翻译官方下载提供了深入分析
Блогеру Арсену Маркаряну дали срок14:50