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+\resizebox{1\columnwidth}{!}{%
+  \begin{tikzpicture}[%
+    ns/.style = {
+      draw=none,
+    },
+    ps/.style = {
+      draw,
+      -latex,
+    },
+  ]
+    \node[ns](gossip){};
+    \node[ns,right=0pt of gossip](retroactive){\textbf{Retroactive}};
+    \node[ns,left=0pt of gossip](proactive){\textbf{Proactive}};
+
+    % proactive
+    \node[ns,left=12pt of proactive](cross){STH cross-logging~\cite{minimal-gossip,ietf-cross-logging,hof-cross-logging,catena}};
+    \node[ns,above=0pt of cross](push){STH pushing~\cite{google-gossip}};
+    \node[ns,below=0pt of cross](cosi){STH cosigning~\cite{cosi}};
+
+    \path[ps] (proactive) -- (push.east);
+    \path[ps] (proactive) -- (cross);
+    \path[ps] (proactive) -- (cosi.east);
+
+    % retroactive
+    \node[ns,right=12pt of retroactive](implicit){Implicit via multipath~\cite{mpaudit}};
+    \node[ns,above=0pt of implicit](pool){STH pooling~\cite{chuat-gossip,ietf-gossip}};
+    \node[ns,below=0pt of implicit](trust){Trusted auditing~\cite{ietf-gossip}};
+    \node[ns,above=14pt of retroactive.north east](feedback){SCT feedback~\cite{ietf-gossip}};
+    \node[ns,below=14pt of retroactive.south east](bee){CT honey bee~\cite{ct-honey-bee}};
+
+    \path[ps] (retroactive) -- (feedback);
+    \path[ps] (retroactive) -- (pool.west);
+    \path[ps] (retroactive) -- (implicit);
+    \path[ps] (retroactive) -- (trust.west);
+    \path[ps] (retroactive) -- (bee);
+  \end{tikzpicture}
+}