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Offline patmenr first paragraph

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Requested by Christian, not sire if I heit what he wanted.
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Jeff Burdges 2016-11-10 17:19:00 +01:00
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doc/paper/taler.tex
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@ -1174,14 +1174,15 @@ deanonymize citizens.
\subsection{Offline Payments} \label{sec:offline}
Chaum's original proposals for anonymous digital cash avoided the need
for online interactions with the exchange to detect double spending by
providing a means to deanonymize customers involved in
double-spending. This is problematic as the exchange or the merchant
still need out-of-band means to recover funds from the customer, which
may be infeasible in practice. Furthermore, a customer may
accidentally deanonymize himself, for example by double-spending a
coin after restoring from backup.
Anonymous digital cash schemes since Chaum were frequently designed
to allow the merchant to be offline during the transaction,
by providing a means to deanonymize customers involved in
double-spending. We consider this problematic as either the
exchange or the merchant still requires an out-of-band
means to recover funds from the customer, an expensive and
unreliable proposition. Worse, there are unacceptable risks that
a customer may accidentally deanonymize herself, for example by
double-spending a coin after restoring from backup.
\subsection{Merchant Tax Audits}