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\begin{figure}[th]
\begin{minipage}[b]{0.45\linewidth}
\begin{center}
\begin{tikzpicture}[scale = 0.4,
transform shape,
msglabel/.style = { text = Black, yshift = .3cm,
sloped, midway },
okmsg/.style = { ->, color = MidnightBlue, thick,
>=stealth },
rstmsg/.style = { ->, color = BrickRed, thick,
>=stealth }
]
\node[draw = MidnightBlue,
fill = CornflowerBlue,
minimum width = .3cm,
minimum height = 10cm
] (h1) at (-4, 0) {};
\node[draw = MidnightBlue,
fill = CornflowerBlue,
minimum width = .3cm,
minimum height = 10cm
] (h2) at (4, 0) {};
\node[above = 0cm of h1] {Wallet};
\node[above = 0cm of h2] {Exchange};
\path[->, color = MidnightBlue, very thick, >=stealth]
(-5, 4.5) edge
node[rotate=90, text = Black, yshift = .3cm] {Time}
(-5, -4.5);
\path[->, color = MidnightBlue, thick, >=stealth]
($(h1.east)+(0,3)$) edge
node[text = Black, yshift = .3cm, sloped] {GET {\tt /keys}}
($(h2.west)+(0,2)$);
\path[->, color = MidnightBlue, thick, >=stealth]
($(h2.west)+(0,0.5)$) edge
node[text = Black, yshift = .3cm, sloped] {200 OK: $S_T(DK,A_{DK},M), S_M(SK)$}
($(h1.east)+(0,-0.5)$);
\node at (5.3, 0) {};
\end{tikzpicture}
\end{center}
\end{minipage}
\hspace{0.4cm}
\begin{minipage}[b]{0.45\linewidth}
\tiny
\begin{description}
\item[$T$] financial regulator key Necessarily pinned
\item[$DK$] RSA public key (``denomination key'')
\item[$A_{DK}$] Value of coins signed by $DK$
\item[$M$] Offline master key of exchange
\item[$SK$] Online signing key of exchange
\end{description}
\end{minipage}
\end{figure}
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