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diff --git a/doc/paper/taler.tex b/doc/paper/taler.tex index 5e9811997..8683d27a0 100644 --- a/doc/paper/taler.tex +++ b/doc/paper/taler.tex @@ -441,6 +441,18 @@ deanonymization risk (see Section~\ref{sec:offline}). %macropayment. It is therefore unclear how Peppercoin would actually %reduce the computational burden on the exchange. +The use of refunds for fractional payments has been suggested in the context of +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 +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 +purpose of income taxation. + + %\vspace{-0.3cm} \section{Design} %\vspace{-0.3cm} |