[GNUnet-SVN] [taler-exchange] branch master updated: add sentence on double-spending detection during refresh

[gnunet]

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new ef71452  add sentence on double-spending detection during refresh
ef71452 is described below

commit ef71452e8c0af5d73b786b69646f5dc5851f077f
Author: Christian Grothoff <address@hidden>
AuthorDate: Tue May 16 15:07:37 2017 +0200

    add sentence on double-spending detection during refresh
---
 doc/paper/taler.tex | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/paper/taler.tex b/doc/paper/taler.tex
index 6f1be80..774300e 100644
--- a/doc/paper/taler.tex
+++ b/doc/paper/taler.tex
@@ -1013,7 +1013,10 @@ than the comparable use of zk-SNARKs in 
ZeroCash~\cite{zerocash}.
     for $i \in \{1,\ldots,\kappa\}$ and sends a signed commitment
      $S_{C'}(\vec{B}, \vec{T_p})$ to the exchange.
   \item % [200 OK / 409 CONFLICT]
-    The exchange generates a random $\gamma$ with $1 \le \gamma \le \kappa$ and
+    The exchange checks that $C'_p$ is a valid coin of sufficient balance
+    to cover the value of the fresh coins to be generated and prevent
+    double-spending.  Then,
+    the exchange generates a random $\gamma$ with $1 \le \gamma \le \kappa$ and
     marks $C'_p$ as spent by persisting
     $\langle C', \gamma, S_{C'}(\vec{B}, \vec{T_p}) \rangle$.
     Auditing processes should assure that $\gamma$ is unpredictable until

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