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@@ -1237,7 +1237,8 @@ simultaneously using a modern payment protocol.
\section*{Acknowledgements}
This work benefits from the financial support of the Brittany Region
-(ARED 9178) and a grant from the Renewable Freedom Foundation.
+(ARED 9178) and a grant from the Renewable Freedom Foundation. We
+thank Neal Walfield for comments on an earlier draft of the paper.
\bibliographystyle{abbrv}
\bibliography{ui,btc,taler,rfc}