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.
The Ceraluminum backplate on my model got a little nick in it that stands out as a white dot on a sea of black, and it's like having a dead pixel on your monitor. You can work around it, but it draws the eye.
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8年，近1亿人脱贫，我国完成了全球规模最大的减贫实践，提前10年实现联合国2030年可持续发展议程的减贫目标，创造了减贫治理的中国样本。