(haven't read the article yet, keep getting 504s) Regarding feasibility & cost, what do you think of the old '"Proof-of-Work" Proves Not to Work' paper? [1] F

(haven't read the article yet, keep getting 504s) Regarding feasibility & cost, what do you think of the old '"Proof-of-Work" Proves Not to Work' paper? [1] From what I remember, the time to hash adequately would be too long to be of practical use/benefit. [1] http://www.hashcash.org/papers/proof-work.pdf http://www.hashcash.org/papers/proof-work.pdf