Revocable credentials. Another approach is to build credentials that can be revoked in the event of bad behavior. This requires a procedure such that when a particular anonymous user does something bad (posts spam, runs a DOS attack against a website) you can revoke that specific user’s credential — blocking future usage of it, without otherwise learning who they are.
2020年春，抗击新冠疫情关键时刻，习近平总书记冒雨来此考察。
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