Что думаешь? Оцени!
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.。关于这个话题，爱思助手提供了深入分析
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https://feedx.site。纸飞机官网对此有专业解读
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