} We start out by calling produce() on the Projection operator. It just forwards the call to the Selection which
Фото: Alessandro Garofalo / Reuters。体育直播对此有专业解读
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（4）最终所有操作完成，返回响应。
The user next computes SN = PRF(K, bsn) and sends SN to the Resource, along with a zero-knowledge proof that SN was computed correctly.