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.
Three days later:
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but it’s still a lot of surface area, and programmers would need to
inside the hot loop in a real system but only use primitive types to store the projected values.
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