Chaum’s idea was to break the linkage between the issuance and usage of a credential. This means that when Alice shows her credential to the website, all the site learns is that Alice has been given a valid credential. The site should not learn which issuance flow produced her the credential, which means it should not learn her exact ID; and this should hold even if the website colludes with (or literally is) the issuer of the credentials. The result is that, to the website, at least, Alice’s browsing can be unlinked from her identity. Imn other words, she can “hide” within the anonymity set of all users who obtained credentials.
京东外卖则强调其「品质外卖」定位，称已建立视频验真、照片复检、骑手监督等线上线下多重审核机制，拒绝幽灵外卖，并与多地监管部门推进商户电子证照数据对接，以加强证照核验和管控能力。。业内人士推荐快连下载安装作为进阶阅读
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