As much as his idea about "changing the world instead of interpreting it" that  Nazists in Germany and Communists in the USSR shared to ruin their societies and recently is employed by Neocons in the USA (apparently for a same purpose) is void and dangerous, Marx's contribution to political economy is one of the greatest human theoretical achievements ever:
He was the first who proposed a scientific and quantitative measure for value of a commodity: work.  

Marx's labour theory of value asserts that although the price of a commodity is determined by supply and demand it is nothing more than a concrete presentation of an abstract and essential  property inherent in each commodity: its value that is determined by the average amount of labour necessary for the society to produce it. Value is not volatile say because of market fluctuations.
By labour Marx implies both live(e.g. man hour) and dead labour which is recursively embedded in the resources that should be consumed/depreciated in the process.

Unfortunately, Das Kapital very soon become the bible of Communists and (remained so for more than a century), fueled by "changing the world" discourse and later completed by a package of other fake revolutionary ideas that fooled an important segment of intellectuals all over the world to act in the best interests of a corrupted regime in Russia.

On the other side, capitalists and their mercenary "scientists" in academies counterattacked by forging their own version of political economy: Marginalism.
More precisely: their own version of anti-political economy or simply, anti-Marx economy.

Marginalism is an exemplary for fake human sciences made/supported for sole political purposes in 20th century. It was based on the most ridiculous interpretation of value: utility.

Common sense is aligned with what utilitarians say: a commodity's value depends on its usefulness, desirability, utility, ... which is wrong just like any other assertion of common sense:
The earth is NOT flat,
Objects do NOT naturally stop moving,
There is NOT any universal clock,
... and
Bitcoin is NOT wasting electricity (as we will see later).

Historically the huge investments on Marginalism helped development of mathematical models, etc. that filled the shelfs of libraries and gave birth to a "science" that somehow was applicable in predicting market behavior and how the demand for a commodity would change due to psychological factors full of excuses for not being precise because of "complexities" in models and probabilistic nature of the variables involved.

Academy's primary mission was rather complicated: eliminating political economy from mainstream and replacing it with more applicable neutralized "sciences" like micro and macro economics.  
Being ruled by giants like  Marx, Ricardo, Smith, ... political economy was not a territory to be conquered by mercenary scientists, after all.

This mission was accomplished by investing on utilitarianism, the trick was presenting  and propagating it as an alternative theory of value in political debates but practically using it as an applicable instrument for predicting the demand (somehow useful sometimes).
This way they managed to convince their students firstly that value is a controversial topic and the neutralized utilitarian point of view is something meaningful like Marx's Labour Theory of Value and finally they became so confident to announce Marx's theory and political economy dead.

And now we are here, bitcoin has emerged and mercenary economists are in a deadly impasse. Their "science" is absolutely void and inefficient for understanding such a revolutionary phenomenon because they have been castrated more than a century ago and don't understand what does a political economic revolution look like.

Recently debating Pos/PoW with a PoS enthusiast I asserted PoS coins are made out of thin air (just like fiat) and the energy consumption in PoW is not a waste because it is the source of bitcoin value. My reasoning was naturally based on the established politico economic labour theory of value, Marx's theory.

Surprisingly, few days later I encountered this article. Again, a pos proponent (I suppose) is questioning the value of bitcoin being measurable by the amount of "work" miners do, this time, by directly claiming Marx's theory to be a fallacy!

It is why I'm becoming more and more convinced that the PoW/PoS debate is nothing less than a final debate between true political economists resurrected after bitcoin on one side and fake mercenary economists with their utilitarian interpretation of value that is incapable of understanding why bitcoin has an inherent value not based on a subjective convention or an artificial demand caused by speculation nor even its usefullness as a medium of exchange and a utility.

From a much wider perspective, I would suggest that the whole crypto currency movement would find its theoretical support in political economy as an original decent science rather than fake anti-Marx discourses that belong to a bitter passed period of history named the cold war.