misc edits based on Neal's comments

articles/ui/btc.bib

@@ -56,7 +56,7 @@
 
 @article{BTC:Bahack13,
   author    = {Lear Bahack},
-  title     = {Theoretical Bitcoin Attacks with less than Half of the Computational
+  title     = {Theoretical {Bitcoin} Attacks with less than Half of the Computational
                Power (draft)},
   journal   = {{IACR} Cryptology ePrint Archive},
   volume    = {2013},
@@ -72,7 +72,7 @@
 
 @inproceedings{BTC:Eclipse,
  author = {Heilman, Ethan and Kendler, Alison and Zohar, Aviv and Goldberg, Sharon},
- title = {Eclipse Attacks on Bitcoin's Peer-to-peer Network},
+ title = {Eclipse Attacks on {Bitcoin's} Peer-to-peer Network},
  booktitle = {Proceedings of the 24th USENIX Conference on Security Symposium},
  series = {SEC'15},
  year = {2015},
@@ -105,7 +105,7 @@
 
 @misc{BTCfees,
   author = {Ofir Beigel},
-  title = {What Bitcoin Exchanges Won’t Tell You About Fees},
+  title = {What {Bitcoin} Exchanges Won’t Tell You About Fees},
   year = {2015},
   actual_date = {11/07/2015},
   url = {https://www.cryptocoinsnews.com/what-bitcoin-exchanges-wont-tell-you-about-fees/},
@@ -139,7 +139,7 @@
 
 @misc{jeffries_economists_v_btc,
   author = {Adrianne Jeffries},
-  title = {Why don’t economists like Bitcoin?},
+  title = {Why don’t economists like {Bitcoin}?},
   subtitle = {Paul Krugman and others can't get behind the virtual currency},
   year = {2013},
   actual_date = {31 December 2013},
@@ -162,7 +162,7 @@
 
 
 @article{BTC:demise,
-  title={Virtual Currencies; Bitcoin \& What Now after Liberty Reserve, Silk Road, and Mt. Gox?},
+  title={Virtual Currencies; {Bitcoin} \& What Now after {Liberty Reserve}, {Silk Road}, and {Mt. Gox}?},
   author={Trautman, Lawrence J},
   journal={Richmond Journal of Law and Technology},
   volume={20},
@@ -173,7 +173,7 @@
 
 
 @inproceedings{miers2013zerocoin,
-  title={Zerocoin: Anonymous distributed e-cash from bitcoin},
+  title={Zerocoin: Anonymous distributed e-cash from {Bitcoin}},
   author={Miers, Ian and Garman, Christina and Green, Matthew and Rubin, Aviel D},
   booktitle={Security and Privacy (SP), 2013 IEEE Symposium on},
   pages={397--411},

articles/ui/taler.bib

@@ -22,7 +22,7 @@
 
 @Misc{target,
   author =    {Michael Riley and Ben Elgin and Dune Lawrence and Carol Matlack},
-  title =     {Missed Alarms and 40 Million Stolen Credit Card Numbers: How Target Blew It},
+  title =     {Missed Alarms and 40 Million Stolen Credit Card Numbers: How {Target} Blew It},
   howpublished = {\url{http://www.bloomberg.com/bw/articles/2014-03-13/target-missed-alarms-in-epic-hack-of\-credit-card-data}},
   month =     {March},
   year =      {2013},

articles/ui/ui.bib

@@ -80,7 +80,7 @@
 
 @Misc{diaspora2011,
   author =    {Josh Constine},
-  title =     {After The Regretsy and Diaspora Account Freezes, We’ve Lost Confidence In PayPal},
+  title =     {After The {Regretsy} and {Diaspora} Account Freezes, We’ve Lost Confidence In {PayPal}},
   howpublished = {\url{http://techcrunch.com/2011/12/06/paypal-account-freeze/}},
   month =     {Dec},
   year =      {2011},
@@ -118,7 +118,7 @@
 
 @Misc{mtan,
   author =    {John E. Dunn},
-  title =     {Eurograbber SMS Trojan steals 36 million from online banks},
+  title =     {Eurograbber {SMS} Trojan steals 36 million from online banks},
   howpublished = {\url{http://www.techworld.com/news/security/eurograbber-sms-trojan-steals-36-million\-from-online-banks-3415014/}},
   month =     {Dec},
   year =      {2012},
@@ -154,7 +154,7 @@
 
 @Misc{adblockblocks,
   author =    {Mark Sweney},
-  title =     {City AM becomes first UK newspaper to ban ad blocker users},
+  title =     {City {AM} becomes first {UK} newspaper to ban ad blocker users},
   howpublished = {\url{http://www.theguardian.com/media/2015/oct/20/city-am-ban-ad-blocker-users}},
   month =     {October},
   year =      {2015},

articles/ui/ui.tex

@@ -1225,12 +1225,6 @@ question for the future is thus whether this data collection will be
 done on behalf of the citizens and under their control, or on behalf
 of the Reich of big data corporations.
 
-We encourage readers to try our prototype for Taler
-at \url{https://demo.taler.net/}, and to ponder why the billion dollar
-e-commerce industry still relies mostly on TLS for security given
-that usability, security and privacy can clearly {\em all} be improved
-simultaneously using a modern payment protocol.
-
 % These APIs are all RESTful in the modern sense because that greatly
 % simplify integrating Taler with web shops and browsers.
 
@@ -1245,6 +1239,21 @@ thank Neal Walfield for comments on an earlier draft of the paper.
 
 \appendix
 
+We encourage readers to try our prototype for Taler
+at \url{https://demo.taler.net/}, and to ponder why the billion dollar
+e-commerce industry still relies mostly on TLS for security given
+that usability, security and privacy can clearly {\em all} be improved
+simultaneously using a modern payment protocol.
+
+The following pages include figures with more detailed illustrations
+of various payment protocols.  They are based on resources from the
+W3c Web Payments Interest Group.
+
+Figures~\ref{listing:presence} and~\ref{listing:contract} provide more
+detailed sample source code for how merchants might integrate their
+systems with Taler.
+
+
 \begin{figure*}
 \begin{center}
 \includegraphics[width=0.95\textwidth]{figs/cc3ds.pdf}