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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 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. and another time for refunding the remaining amount without losing anonymity.
Unfortunately this approach cannot be used for a general-purpose payment 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 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 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 transaction between two parties that is not recognized by the system for the