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     7 % For Alice to cheat, she has to get her transaction into the blockchain.

     8 % For this she has to solve proof-of-work puzzles faster than anybody

     9 % else. Is it possible for her to precompute several blocks that would

    10 % validate a fraudulent transaction by her? Give a short explanation

    11 % for your reasoning.  

    12 

    13 \section*{Homework 7}

    14 

    15 \HEADER

    16 

    17 \begin{enumerate}

    18 \item How can the hardness of the proof-of-work puzzles in

    19       Bitcoins be adjusted? What is parameter that determines

    20       how the hardness is adjusted?

    21 

    22 \item What is the main data that is stored in Bitcoin's

    23       blockchain? 

    24       

    25 \item What is is the purpose of the proof-of-work puzzle in

    26       Bitcoins?      

    27 

    28 \item The department has large labs full of computers that are

    29       pretty much idle over night. Why is it a bad idea to let

    30       them mine for Bitcoins?

    31 

    32 \item Is it possible that Bitcoins can get lost (be

    33       irretrievable)?

    34 

    35 \item \POSTSCRIPT      

    36 \end{enumerate}

    37 \end{document}

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