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scott schrieb:
>> What would likely happen is the system would detect the stamp was
>> already used, and kick it back to the sender with "Insufficient
>> Postage" emblazoned across the stamp.
>
> I wonder if they even bother to check them against a database of already
> used/issued ones? Maybe they just check the checksum?
The German "Post" has a similar system, and they /do/ check it against a
database.
BTW, the German 2D "stamp" barcode even encodes the full destination
address information, which has the benefit (for the "Post") of (a)
rendering the stamp fundamentally un-reusable anyway except for mails to
the same addressee, and (b) making the address even easier machine-readable.
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