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We can modify our ZK credential to support a limit of N shows as follows. First, let’s have the User select a random key K for a pseudorandom function (PRF), which takes a key and an arbitrary input and outputs a random-looking outputs. We’ll embed this key K into the signed credential. (It’s important that the Issuer does not learn K, so this often requires that the credential be signed using a blind, or partially-blind, signing protocol.3) We’ll now use this key and PRF to generate unique serial numbers, each time we “show” the credential.，详情可参考体育直播
（3）行情持续性与估值判断：化工属于高弹性行业，景气周期来临时弹性远高于大盘，且当前景气向上叠加流动性充裕，长期配置需求旺盛，作为高赔率资产，在风偏高的市场环境下提前兑现部分预期属于正常情况。过往化工行业每轮景气周期基本为两年左右，但判断本轮景气周期或更长，目前尚未到讨论行情高点或卖点的阶段，需待主要产品价格涨至历史高位、盈利处于高水平时再分析是否进入周期中后期，由于周期品价格高度难以准确预测，顺势而为是较为合理的选择。