[GNUnet-SVN] [taler-exchange] 01/04: starting with exculpability

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grothoff pushed a commit to branch master
in repository exchange.

commit 024dc5625915db78e03614b44c64543ac4de2a15
Author: Christian Grothoff <address@hidden>
AuthorDate: Tue May 16 13:40:29 2017 +0200

    starting with exculpability
---
 doc/paper/taler.tex | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/doc/paper/taler.tex b/doc/paper/taler.tex
index 8b48ad8..7dd42b8 100644
--- a/doc/paper/taler.tex
+++ b/doc/paper/taler.tex
@@ -1555,7 +1555,49 @@ protocol is never used.  Furthermore, if a customer 
needs to recover
 control over a coin using the linking protocol, they can use the
 refresh protocol on the result to again obtain an unlinkable coin.
 
+\section{Exculpability arguments}
 
+\begin{lemma}
+The exchange can detect and prove double-spending.
+\end{lemma}
+
+\begin{proof}
+\end{proof}
+
+\begin{lemma}
+Merchants and customers can verify double-spending proofs.
+\end{lemma}
+
+\begin{proof}
+\end{proof}
+
+
+\begin{lemma}
+Customers can either obtain proof-of-payment or their money back.
+\end{lemma}
+
+\begin{proof}
+\end{proof}
+
+\begin{lemma}
+If a customer paid for a contract, they can prove it.
+\end{lemma}
+
+\begin{proof}
+\end{proof}
+
+\begin{lemma}
+The merchant can issue refunds, and only to the original customer.
+\end{lemma}
+
+\begin{proof}
+\end{proof}
+
+
+
+\begin{theorem}
+  The protocol prevents double-spending and provides exculpability.
+\end{theorem}
 
 \end{document}
 

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