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Florian Dold 2017-05-17 16:18:02 +02:00
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@ -446,7 +446,7 @@ payment systems for public transit fees \cite{rupp2013p4r}. This approach
relies on 2-showable coins that can be used one time for fractional spending
and another time for refunding the remaining amount without losing anonymity.
Unfortunately this approach cannot be used for a general-purpose payment
system, since the refund operation of Rupp et al. allows transfeing money
system, since the refund operation of Rupp et al. allows transferring money
in a way that hides income from taxation. Refunding a coin into a wallet that
didn't withdraw the coin is possible in their system, but consitutes a
transaction between two parties that is not recognized by the system for the