\begin{sequencediagram}
    \newthread{actor}{Actor}{}
    \newinst[4]{concordia}{:Concordia}{}
    \newinst[1]{eth}{:Ethereum}{}
    \newinst[1]{orbit}{:OrbitDB}{}

    \begin{call}{actor}{Delete local data}{concordia}{Delete confirmation form}
    \end{call}

    \begin{call}{actor}{Submit}{concordia}{}

        \begin{call}{concordia}{Delete local DBs}{orbit}{}
        \end{call}

    \end{call}
\end{sequencediagram}