\begin{sequencediagram} \newthread{actor}{Actor}{} \newinst[4]{concordia}{:Concordia}{} \newinst[2]{eth}{:Ethereum}{} \newinst[1]{orbit}{:OrbitDb}{} \begin{call}{actor}{Create topic}{concordia}{Topic creation form} \end{call} \begin{call}{actor}{Submit}{concordia}{New topic page} \begin{call}{concordia}{Create topic}{eth}{New topic ID} \end{call} \begin{call}{concordia}{Save topic information}{orbit}{} \end{call} \end{call} \end{sequencediagram}