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Digital cash issuess...
>As a consequence, our
>cash system is much more efficient in both computation and
>communication complexity than previously proposed systems."
I take this with a grain of salt; see below.
>In our opinion, the most interesting of
>these is that the entire cash system (including all the extensions)
>can be incorporated straightforwardly in a setting based on wallets
>with observers,
I am not surprised that they find this interesting; David Chaum has
patented all the observer protocols.
Having read these protocols in the original, I can say this is not
much of an advantage. The observer protocols are tremendously
expensive computationally. Anything you build on top of it won't be
any faster.
Eric