\begin{sequencediagram} \newthread{actor}{Actor}{} \newinst[3]{concordia}{:Concordia}{} \newinst[2]{eth}{:Ethereum}{} \newinst[1]{orbit}{:OrbitDB}{} \begin{call}{actor}{Create post}{concordia}{Post creation form} \end{call} \begin{call}{actor}{Submit}{concordia}{Updated topic page} \begin{call}{concordia}{Create post}{eth}{New post ID} \end{call} \begin{call}{concordia}{Save post information}{orbit}{} \end{call} \end{call} \end{sequencediagram}