第二重绞索，最为基础，也最为刚性：触及全球性天花板的“能源供给”。
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数据：黄金萍 曹妍 罗仙仙 丁莉 柯玉圆 卫酉祎 唐家乐 龙洁 付烁畦 吴舒敏 蒙露 朱奕萱 林骏杰 邹子贤 陈炜
This approach can be constructed in many variants. For example, with some simple tweaks, can build credentials that only permit the User to employ the credential a limited number of times in any given time period: for example, at most 100 times per day.4 This requires us to simply change the inputs to the PRF function, so that they include a time period (for example, the date) as well as a counter. These techniques are described in a great paper whose title I’ve stolen for this section.