\section*{Image Sources}
Figure \ref{fig:peepeth-architecture}:
\begin{itemize}
	\item Servers by ProSymbols from the Noun Project, \url{https://thenounproject.com/search/?q=server\&i=2023410}, accessed 21.03.2019
	\item Database by Kimmi Studio from the Noun Project, \url{https://thenounproject.com/search/?q=database\&i=2321456}, accessed 21.03.2019
	\item Blockchain by Matthias Hartmann from the Noun Project, \url{https://thenounproject.com/term/blockchain/2306694/}, accessed 21.03.2019
	\item Browser by QualityIcons from the Noun Project, \url{https://thenounproject.com/search/?q=browser\&i=2328976}, accessed 21.03.2019
	\item Peepeth logo, \url{https://s3-us-west-1.amazonaws.com/peepeth/logosquare.png}, accessed 21.03.2019
	\item IPFS logo, \url{https://github.com/ipfs/logo}), accessed 21.03.2019
	\item Ethereum Logo, \url{https://de.wikipedia.org/wiki/Ethereum#/media/File:Ethereum_logo.svg}, accessed 21.03.2019
\end{itemize}

Figure \ref{fig:solution-architecture}:
\begin{itemize}
	\item Servers by ProSymbols from the Noun Project, \url{https://thenounproject.com/search/?q=server\&i=2023410}, accessed 21.03.2019
	\item User by Wilson Joseph from the Noun Project, \url{https://thenounproject.com/search/?q=user\&i=911745}, accessed 21.03.2019
\end{itemize}

Figure \ref{fig:building-block-view}, Figure \ref{fig:building-block-view-level1}, Figure \ref{fig:post-tweet-building-block-view}, Figure \ref{fig:home-timeline-building-block-view}:
\begin{itemize}
	\item Stick figure by Adam Beasley from the Noun Project \url{https://thenounproject.com/search/?q=stick\%20figure\&i=203593}, accessed 21.03.2019
\end{itemize}