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This serial number check can be done using a simple local database at the Resource (website). Things get a bit more complicated if there are many Resources (say different websites), and you want to prevent credential re-use across all of them. The typical solution outsources serial number checks to some centralized service (or bulletin board) so that a user can’t use the same credential across many different sites.
，这一点在safew官方版本下载中也有详细论述
I can tell you at Google, we’ve heavily relied on that flexibility in our monorepo.，更多细节参见同城约会
外祖父母和子女的全家福，摄于1970年。（受访者供图），详情可参考91视频