Re: e-postage stamps, was Welcome to the new(ish) ASRG list

> > Double spending has nothing to do with counterfeiting.
>
>You're splitting hairs, if I spend the same token more than once the
>subsequent tokens are in effect counterfeit.
>
>Fraudulent, if you prefer.

The difference is that since all digital copies are perfect, all of
the copies of the stamp are real, and the only way to tell that it's
been spent is to try to cash it and see what the issuer says.
Counterfeit money or stamps may look real, but the fake ones are
different in some way from real ones.

Once again, this is a well known difficult problem for any digital
currency, one that has never been solved at scale.

R's,
John

PS: It's also one that I wrote about in my e-postage white paper ten
years ago.  It was hard then, and it's hard now.