Blockchain, Blockchain, Blockchain

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diff --git a/presentations/investors/investors2017ls.tex b/presentations/investors/investors2017ls.tex
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--- a/presentations/investors/investors2017ls.tex
+++ b/presentations/investors/investors2017ls.tex
@@ -822,6 +822,21 @@ PM $=$ Person month
   \end{center}
 \end{frame}
 
+
+\begin{frame}{Potential Synergies between Taler and Blockchains}
+  \begin{block}{What can Blockchains do for Taler?}
+    Taler cannot cryptographically prove the {\bf timing} of
+    transactions.  Using a blockchain for {\bf timestamping} would
+    allow GNU Taler to provide hard proof of {\bf when} a payment
+    happened.
+  \end{block}
+  \begin{block}{What can Taler do for Blockchains?}
+    Blockchains have inherently high transaction {\bf costs} and little
+    {\bf privacy}.  Taler can operate as a {\bf side-chain}, providing
+    enhanced privacy and {\bf performance} for crypto currencies.
+  \end{block}
+\end{frame}
+
 \end{document}