%0 Journal Article %A D. M. Murin %A V. N. Knyazev %T On the issue of using “Useful” tasks for proof of works in blockchain %J Modelirovanie i analiz informacionnyh sistem %D 2019 %P 244-255 %V 26 %N 2 %U http://geodesic.mathdoc.fr/item/MAIS_2019_26_2_a4/ %G ru %F MAIS_2019_26_2_a4