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To “show” the credential to some Resource, the user simply needs to hand over the pair (SN, signature). Assuming the Resource knows the public key (PK) of the issuer, it can simply verify that (1) the signature is valid on SN, and (2) nobody has every used that value SN in some previous credential “show”.，更多细节参见搜狗输入法下载
Supermarket shoppers in Rushden, England, observing the 2-metre rule in the first Covid lockdown, 2020. Photograph: David Rogers/Getty ImagesIs it going to change your life if you talk to someone in a shop about the prospect of rain? Probably not. But in light of the current state of the world, even the slightest possibility of brightening someone’s day is valuable. It’s certainly worth the punt. Perhaps the way they respond matters less than the fact that you retained your humanity enough to try something, to risk, to connect.。快连下载安装对此有专业解读
It will be shown in selected cinemas from Friday for two weeks, and will then stream on Netflix from 20 March.