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\section{Shutdown}
\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]{bank}{\shortstack{Customer bank \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] {Checking \\ Accounts};
\end{tikzpicture}
}}
\postlevel
\begin{callself}{exchange}{Operator initiates shutdown}{}
\end{callself}
\mess[0]{exchange}{{Shutdown alert}}{wallet}
\begin{sdblock}{Bank account known?}{}
\begin{callself}{wallet}{Designate bank account}{}
\end{callself}
\end{sdblock}
\mess[0]{wallet}{{Deposit (Coins)}}{exchange}
\begin{sdblock}{Acceptable account?}{}
\mess[0]{exchange}{{Refuse deposit}}{wallet}
\end{sdblock}
\begin{sdblock}{KYC/AML required?}{}
\begin{callself}{exchange}{Figures~\ref{fig:proc:kyc}, \ref{fig:proc:aml}}{}
\end{callself}
\end{sdblock}
\mess[0]{exchange}{{Initiate transfer}}{bank}
\end{sequencediagram}
\caption{Shutdown interactions between customer, Taler exchange (payment
service provider) and bank.}
\label{fig:int:shutdown}
\end{figure}
KYC/AML requirements are relaxed in cases where the customer is able to
cryptographically demonstrate that they previously withdrew these coins from
the designated checking account. Thus, KYC/AML checks here primarily still
apply if the customer received the funds via P2P transfers from other wallets.
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