\documentclass{article}\usepackage{../style}\begin{document}\section*{Homework 8}\begin{enumerate}\item (\textbf{Optional}) 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 (\textbf{Optional}) What is the main data that is stored in Bitcoin's blockchain? \item (\textbf{Optional}) What is is the purpose of the proof-of-work puzzle in Bitcoins? \item (\textbf{Optional}) 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?\end{enumerate}\end{document}%%% Local Variables: %%% mode: latex%%% TeX-master: t%%% End: