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% For Alice to cheat, she has to get her transaction into the blockchain.
% For this she has to solve proof-of-work puzzles faster than anybody
% else. Is it possible for her to precompute several blocks that would
% validate a fraudulent transaction by her? Give a short explanation
% for your reasoning.  

\section*{Homework 7}

\HEADER

\begin{enumerate}
\item How can the hardness of the proof-of-work puzzles in
      Bitcoins be adjusted? What is parameter that determines
      how the hardness is adjusted?

\item What is the main data that is stored in Bitcoin's
      blockchain? 
      
\item What is is the purpose of the proof-of-work puzzle in
      Bitcoins?      

\item The department has large labs full of computers that are
      pretty much idle over night. Why is it a bad idea to let
      them mine for Bitcoins?

\item Is it possible that Bitcoins can get lost (be
      irretrievable)?

\item \POSTSCRIPT      
\end{enumerate}
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