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A variant of the ZK proof, called the non-interactive zero-knowledge proof (NIZK) lets me do this in a single message from User to Issuer. Using this tool, I can build a credential system as follows:
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John Sudworth says the sounds of heavy machinery can be heard echoing around the neighbourhood.
Фото: Sputnik / Gavriil Grigorov / Pool / Reuters。搜狗输入法下载对此有专业解读