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\begin{SCfigure}
\begin{minipage}[b]{0.45\linewidth}
\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[okmsg, dashed]
($(h1.east)+(0, 4.0)+(0, -1.0)$) edge
node[msglabel] {SEPA(RK,A)}
($(h2.west)+(0, 3.5)+(0, -1.0)$);
\path[okmsg]
($(h1.east)+(0, -1.0)$) edge
node[msglabel] {$S_{RK}(DK, B_b(C))$}
($(h2.west)+(0, -1.5)$);
\path[okmsg]
($(h2.west)+(0, -2.0)$) edge
node[msglabel] {200 OK: $S_{DK}(B_b(C))$)}
($(h1.east)+(0, -2.5)$);
\path[rstmsg]
($(h2.west)+(0, -3.5)$) edge
node[msglabel] {402 PAYMENT REQUIRED: $S_{RK}(DK, B_b(C))$)}
($(h1.east)+(0, -4)$);
\node at (5.3, 0) {};
\end{tikzpicture}
\end{minipage}
\end{SCfigure}
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