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     6 \section*{Homework 8}

     7 

     8 \begin{enumerate}

     9 \item (\textbf{Optional}) How can the hardness of the

    10       proof-of-work puzzles in Bitcoins be adjusted? What is

    11       parameter that determines how the hardness is adjusted?

    12 

    13 \item (\textbf{Optional}) What is the main data that is stored

    14       in Bitcoin's blockchain? 

    15       

    16 \item (\textbf{Optional}) What is is the purpose of the

    17       proof-of-work puzzle in Bitcoins?      

    18 

    19 \end{enumerate}

    20 \end{document}

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