Why food fraud persists, even with improving tech
（一）通过虚构交易、编造用户评价等方式进行虚假或者引人误解的商业宣传，或者损害他人商业信誉、商品声誉，干扰网络交易正常进行的；
。业内人士推荐51吃瓜作为进阶阅读
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clash下载
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await Stream.pipeTo(source, writer);