'Despicable'
One clever approach is to place an upper bound on the number of times that a ZK credential can be used. For example, we might wish to ensure that a credential can be “shown” at most N times before it expires. This is analogous to extracting many different single-use credentials, without the hassle of having to make the Issuer and User do quite as much work.
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（二）乏燃料，是指在反应堆堆芯内受过辐照并从堆芯永久卸出的核燃料。。业内人士推荐体育直播作为进阶阅读
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