Presentation draft 2

3 files changed, 151 insertions, 49 deletions

diff --git a/docs/fee.png b/docs/fee.png
new file mode 100644
index 0000000..283c286
--- /dev/null
+++ b/docs/fee.png
diff --git a/docs/presentation.tex b/docs/presentation.tex
index 083d228..18d05c4 100644
--- a/docs/presentation.tex
+++ b/docs/presentation.tex
@@ -1,15 +1,15 @@
 \documentclass{beamer}
-
-\usetheme{default}
  
 \usepackage{tikz}
-\usetikzlibrary{positioning}
 
-\title{Depolymerization WIP}
-\subtitle{TODO}
-\author{TODO}
-\institute{TODO}
+\usetikzlibrary{positioning,fit}
+
+\title{Depolymerization}
+\subtitle{Linking Taler with blockchain based cryptocurrencies}
+\author{Antoine d'Aligny}
+\institute{Bern University of Applied Sciences}
 \date{\today}
+\titlegraphic{\includegraphics[width=2.5cm]{taler.png}} 
 
 \begin{document}
 
@@ -21,77 +21,102 @@
     \tableofcontents
 \end{frame}
 
-\begin{frame}{Introduction}{Blockchain}
-    \begin{block}{Common blockchain limitation}
-        \begin{itemize}
-            \item \textbf{Slow} limited amount of transaction per seconds
-            \item \textbf{Delayed} block and confirmation delay
-            \item \textbf{Expensive} transaction fees
-            \item \textbf{Privacy} pseudonym and noise
-            \item \textbf{Compatibility} multiple blockchain and transactions format
-        \end{itemize}
-    \end{block}
+\section{Introduction}
 
+\begin{frame}{Introduction}
     \begin{block}{Biggest cryptocurrencies}
         \begin{itemize}
             \item \textbf{BTC} Bitcoin
             \item \textbf{ETH} Ethereum
         \end{itemize}
     \end{block}
-\end{frame}
 
-\begin{frame}{Introduction}{Related work}
-    \begin{block}{Centralization - Coinbase's off-chain sending}
-        \begin{itemize}
-            \item [$+$] Fast and cheap: off chain transaction
-            \item [$-$] Trust in Coinbase: privacy, security \& transparency
-        \end{itemize}
-    \end{block}
-    \begin{block}{Layering - Lightning Network}
+    \begin{block}{Common blockchain limitation}
         \begin{itemize}
-            \item [$+$] Fast and cheap: off chain transaction
-            \item [$-$] Incompatible with Bitcoin: require setting up a Bidirectional Payment Channels
-            \item [$-$] Fraud attempts are mitigated via a complex penalty system
+            \item \textbf{Delayed} block and confirmation delay
+            \item \textbf{Expensive} transaction fees
+            \item \textbf{Scalability} limited amount of transaction per seconds
+            \item \textbf{Ecological cost} computation redundancy
+            \item \textbf{Privacy}
         \end{itemize}
     \end{block}
 \end{frame}
 
-\begin{frame}{Introduction}{Taler}
-    \begin{itemize}
-        \item [$-$] Trust exchange operator or auditors
-        \item [$+$] Fast and cheap, no blockchain
-        \item [$+$] Privacy when it can, transparency when it must (avoid tax evasion and money laundering)
-        \item [$+$] Currency agnostic
-    \end{itemize}
+\section{Taler}
+
+\begin{frame}{Taler}{Architecture}
+    \begin{center}
+        \begin{tikzpicture}[
+                rect/.style={circle, draw=black},
+                sym/.style={->, shorten >= 2pt, shorten <= 2pt}
+            ]
+            \node[rect](1) {Exchange};
+            \node[rect, below left=1.5cm and 0.7cm of 1](2) {Customer};
+            \node[rect, below right=1.5cm and 0.7cm of 1](3) {Merchant};
+
+            \draw[sym] (1) -- node [midway, left] {\tiny Withdraw coins} (2);
+            \draw[sym] (2) -- node [midway, below] {\tiny Spend coins} (3);
+            \draw[sym] (3) -- node [midway, right] {\tiny Deposit coins} (1);
+
+            \node[left=2cm of 1](E1){};
+            \node[right=2cm of 1](E2){};
+            \draw[sym] (E1) -- node [midway, above] {\tiny Deposit money} (1);
+            \draw[sym] (1) -- node [midway, above] {\tiny Withdraw money} (E2);
+
+
+            \node[above= of 1](A){Auditor};
+            \draw[sym] (A) -- node [midway, right] {\tiny Audit} (1);
+        \end{tikzpicture}
+    \end{center}
 \end{frame}
 
-\begin{frame}{Architecture}{Taler bridge to blockchain}
+\begin{frame}{Taler}{Coins}
+    - Blind signatures
+    - Currency agnostic
+    - Change signature every year, Forget previous transactions (Pruning)
+    - Compatibility ?
+\end{frame}
+
+\begin{frame}{Taler}{Off the chain transaction}
     \begin{center}
         \begin{tikzpicture}[
                 rect/.style={rectangle, draw=black},
                 sym/.style={<->, shorten >= 2pt, shorten <= 2pt}
             ]
-            \node[rect](1) {Taler};
-            \node[rect, right= of 1](2) {Depolymerization};
-            \node[rect, right= of 2](3) {Blockchain};
+            \node(Tt){Taler};
+            \node[rect, below=0cm of Tt](Tc){Exchange};
+            \node[rect, fit={(Tt) (Tc)}](T){};
+
+            \node[rect, below= of Tc](D) {Depolymerization};
 
-            \draw[sym] (1) -- (2);
-            \draw[sym] (2) -- (3);
+            \node[rect, below= of D](Bc){Node};
+            \node[below=0cmof Bc](Bt){Blockchain};
+            \node[rect, fit={(Bt) (Bc)}](B){};
+
+            \draw[sym] (T) -- (D);
+            \draw[sym] (D) -- (B);
         \end{tikzpicture}
     \end{center}
 \end{frame}
 
-\begin{frame}{Architecture}{depolymerization}
+\section{Depolymerization}
+
+\begin{frame}{Depolymerization}{Metadata}
+    - Metadata
+    - Auditabilité
+\end{frame}
+
+\begin{frame}{Depolymerization}{Architecture}
     \begin{center}
         \begin{tikzpicture}[
                 rect/.style={rectangle, draw=black},
                 sym/.style={<->, shorten >= 2pt, shorten <= 2pt}
             ]
-            \node[rect](1) {Taler};
+            \node[rect](1) {Taler Exchange};
             \node[rect, below= of 1](2) {wire\_gateway};
             \node[rect, right= of 2](3) {PostgreSQL};
-            \node[rect, right= of 3](4) {btc\_wire};
-            \node[rect, above= of 4](5) {bitcoind};
+            \node[rect, right= of 3](4) {\#\#\#\_wire};
+            \node[rect, above= of 4](5) {Full Node};
 
             \draw[sym] (1) -- node [midway, right] {\tiny HTTP} (2);
             \draw[sym] (2) -- node [midway, above] {\tiny SQL} (3);
@@ -101,6 +126,8 @@
     \end{center}
 \end{frame}
 
+\section{btc\_wire}
+
 \begin{frame}{btc\_wire}{Architecture}
     Three loops
     Watcher: Notify other loops when a new block has been mined
@@ -108,12 +135,87 @@
     Worker: Sync chain -> Send -> Bounce
 \end{frame}
 
-\begin{frame}{btc\_wire}{Features}
+\begin{frame}{btc\_wire}{Security features}
     \begin{itemize}
-        \item Handle stuck transactions
-        \item Fork resilient
+        \item Reorg resilient
+        \item Handle stuck transaction
         \item Adaptive confirmation
     \end{itemize}
 \end{frame}
 
+\begin{frame}{btc\_wire}{Reorg resilient}
+\end{frame}
+
+\begin{frame}{btc\_wire}{Handle stuck transactions}
+    \only<1>{We want transactions to be confirmed in a bounded time period}
+    \begin{center}
+        \begin{tikzpicture}[
+                dot/.style={circle,fill,inner sep=1pt,}
+            ]
+
+            % TODO caption with source (Ychart)
+
+            \node (I) {\includegraphics[width=\textwidth]{fee.png}};
+            \only<2->{
+                \node [below left=-2.5mm and -1.5cm of I] (Tx) {\small Tx};
+                \node [dot, above=8.4mm of Tx](D) {};
+                \draw [dotted] (Tx) -- (D);
+            };
+            \only<2>{
+                \node [left=-4.5cm of Tx] (C) {\small conf};
+                \node [dot, above=8.4mm of C](D1) {};
+                \draw [dotted] (C) -- (D1);
+            };
+            \only<3>{
+                \node [left=-17mm of Tx] (Tx1) {\small Tx'};
+                \node [dot, above=15.5mm of Tx1](D1) {};
+                \draw [dotted] (Tx1) -- (D1);
+
+                \node [left=-14.3mm of Tx1] (C) {\small conf};
+                \node [dot, above=15.5mm of C](D2) {};
+                \draw [dotted] (C) -- (D2);
+            };
+
+        \end{tikzpicture}
+    \end{center}
+    \only<1>{However, transaction fees are variable and can only be predicted}
+    \only<2>{When a transaction is sent with a fee too small compared to other transaction,
+        it can take an unlimited amount of time for this transaction to be mined}
+    \only<3>{We monitor pending transaction and bump their fee if they take too muck time to be mined}
+
+\end{frame}
+
+
+\begin{frame}{btc\_wire}{Adaptive confirmation}
+\end{frame}
+
+
+
+\begin{frame}{Related work}
+    \begin{block}{Centralization - Coinbase off-chain sending}
+        \begin{itemize}
+            \item [$+$] Fast and cheap: off chain transaction
+            \item [$-$] Trust in Coinbase: privacy, security \& transparency
+        \end{itemize}
+    \end{block}
+    \begin{block}{Layering - Lightning Network}
+        \begin{itemize}
+            \item [$+$] Fast and cheap: off chain transaction
+            \item [$-$] Incompatible with Bitcoin: require setting up a Bidirectional Payment Channel
+            \item [$-$] Fraud attempts are mitigated via a complex penalty system
+        \end{itemize}
+    \end{block}
+\end{frame}
+
+\begin{frame}{Conclusion}
+    \begin{itemize}
+        \item [$-$] Trust exchange operator or auditors
+        \item [$+$] Fast and cheap, no blockchain
+        \item [$+$] Realtime, ms latency
+        \item [$+$] Scalability, close to 100k txs per second
+        \item [$+$] Ecological
+        \item [$+$] Privacy when it can, transparency when it must (avoid tax evasion and money laundering)
+        \item [$+$] Currency agnostic
+    \end{itemize}
+\end{frame}
 \end{document}
\ No newline at end of file
diff --git a/docs/taler.png b/docs/taler.png
new file mode 100644
index 0000000..503ae20
--- /dev/null
+++ b/docs/taler.png