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Make double pending Exculpability section about prevention

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Jeffrey Burdges 2017-05-17 23:58:31 +02:00
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doc/paper/taler.tex
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@ -1407,7 +1407,7 @@ protocol is never used.
\subsection{Exculpability arguments}
\begin{lemma}\label{lemma:double-spending}
The exchange can detect and prove double-spending.
The exchange can detect, prevent, and prove double-spending.
\end{lemma}
\begin{proof}
@ -1417,13 +1417,15 @@ obtains either a deposit-permission or a refresh-record, both of which
contain a signature made with the public key of coin to authorizing the
respective operation. If the exchange has a set of refresh-records and
deposit-permissions whose total value exceed the value of the coin, the
exchange can show this set to prove that double-spending was attempted.
exchange can show this set to prove that double-spending is being
attempted and justify rejecting the operation.
\end{proof}
\begin{corollary}
Merchants and customers can verify double-spending proofs by verifying that the
signatures in the set of refresh-records and deposit-permissions are correct and
that the total value exceeds the coin's value.
Merchants and customers can verify proofs of double-spending attempts
by verifying that the signatures in the set of refresh-records and
deposit-permissions are correct and that the total value would exceed
the coin's value.
\end{corollary}
\begin{lemma}