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+\section{Domestic wallet check} \label{sec:proc:domestic}
+
+\begin{figure}[h!]
+  \begin{sequencediagram}
+    \newinst{wallet}{\shortstack{Customer wallet \\
+      \\ \begin{tikzpicture}
+        \node [fill=gray!20,draw=black,thick,align=center] { Unique \\ Wallet ID};
+      \end{tikzpicture}
+    }}
+    \newinst[2]{exchange}{\shortstack{Taler (exchange) \\
+       \\ \begin{tikzpicture}[shape aspect=.5]
+        \tikzset{every node/.style={cylinder,shape border rotate=90, draw,fill=gray!25}}
+        \node at (1.5,0) {\shortstack{{{\tiny Database}}}};
+       \end{tikzpicture}
+    }}
+    \newinst[2]{sms}{\shortstack{Address validator}}
+
+    \postlevel
+    \mess[0]{wallet}{{P2P payment (Wallet ID)}}{exchange}
+    \begin{callself}{exchange}{New wallet?}{}
+    \end{callself}
+    \mess[0]{exchange}{Request address validation}{sms}
+    \mess[0]{sms}{Validation process ID}{exchange}
+    \mess[0]{exchange}{Request address validation}{wallet}
+    \mess[0]{wallet}{Send address}{sms}
+    \mess[0]{sms}{{Send confirmation code (to address)}}{wallet}
+    \mess[0]{wallet}{Supply confirmation code}{sms}
+    \mess[0]{sms}{{Confirmed customer address}}{exchange}
+    \mess[0]{exchange}{{Confirm completion}}{wallet}
+    \mess[0]{wallet}{{Retry action}}{exchange}
+\end{sequencediagram}
+  \caption{Deposit interactions between customer, Taler exchange (payment
+    service provider) and external address validation service.  The process can be
+    triggered by wallet-to-wallet (P2P) payments described in Chapter~\ref{chap:triggers}.}
+  \label{fig:proc:domestic}
+\end{figure}
+
+Our users have to accept the terms of service which restrict the use of the
+service to domestic customers.  For interactions with the core banking system,
+this simply means that we only accept payments from or to domestic bank
+accounts.  For P2P payments between wallets, we require that the wallets are
+controlled by a domestic entity.  We define domestic entities as those that
+are able to receive messages at a domestic address. Two types of addresses are
+supported:
+
+\begin{itemize}
+\item Control over a domestic {\bf mobile phone number} is established
+  by sending an SMS message with a confirmation code to the MSIN.
+\item Control over a domestic {\bf postal address} is established by
+  sending a letter with a confirmation code to the address.
+\end{itemize}
+
+Depending on the type of address, a validation has a limited validity period,
+as shown in Table~\ref{table:proc:domestic}.  When the validity period is
+over, a wallet has to re-do the address validation before they can receive any
+further funds through the service.
+
+\begin{table}[h!]
+  \caption{Restrictions on address validations}
+  \label{table:proc:domestic}
+  \begin{tabular}{l|l|r}
+    {\bf Type}          & {\bf Validity period} & {\bf Restricted to} \\ \hline \hline
+    Mobile phone number & 12 months             & {\em +41} \\
+    Postal address      & 36 months             & {\em Switzerland} \\
+  \end{tabular}
+\end{table}