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.
而Ubras的无尺码内衣，其实是将产品高度标准化，简化为按身高体重划分的S/M/L或干脆均码。这一粗暴的简化，彻底绕开了线上购买内衣，尺码选择困难这一最大的痛点。它让购买内衣变得像买一件T恤一样简单，决策路径大幅缩短，完美适配了疫情下被迫线上化的消费场景。
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