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@@ -98,7 +98,9 @@ We describe new security properties for e-cash that preserve anonymity without
loss of funds in certain failure scenarios, which are made possible with an
anonymous change protocol \cite{brickell1995trustee}. We improve a na\"ive
change protocol so that is cannot be used for hiding transaction from tax
-authorities as a merchant.
+authorities as a merchant. An e-cash variant with these property easily lends
+itself for the implementation of fair exchange \cite{camenisch2007endorsed} and
+tick payments \cite{pedersen1996electronic}.
\section{Model and Syntax}