Decentralization has nothing to do with Marxism. Decentralization respects individual rights, private property, voluntary trading and follows meritocracy, while marxism goes against all those fundamental principles. Marxism might be against state's opression only on the paper, because in reality it's an opressive mentality making use of the state's power against the individuals of a society, or as they like saying: the sheep people.

In a marxist society you wouldn't own any bitcoins. All your coins would be seized by the communist party. Wake up!