\begin{sequencediagram}
    \newthread{actor}{Actor}{}
    \newinst[2]{concordia}{:Concordia}{}
    \newinst[2]{eth}{:Ethereum}{}
    \newinst[1]{orbit}{:OrbitDb}{}

    \begin{call}{actor}{Fetch page}{concordia}{}

        \begin{call}{concordia}{Get user}{eth}{User information}
        \end{call}

        \begin{call}{concordia}{Create databases}{orbit}{}
        \end{call}

    \end{call}
\end{sequencediagram}