I'm guessing you mean decentralization of government? Some form of government will have to exist whether on a larger scale or smaller scale. Depending on the perspective you're look at, splitting the planet into countries can be considered a form of decentralization already. Once we become an interplanetary species, I would argue that we actually need more centralization of government where Earth would have one government and Mars would have its own government.
What form this government will take would be interesting. I think our closest attempt to having one governmental body govern multiple countries would be the European Union (Some may say the United Nations plays that role, but the United Nations doesn't really do any actual governing).
Personally, I think humanity's mindset needs to change towards prioritizing the growth of humanity instead of the growth of economics/finances before a global government is possible. Then and only then, I think the only possible form of a global government would be an highly centralized, authoritarian but benevolent and focused on benefiting the people. By then, we should have AI and robots doing most of the work already anyways, and people becoming more artisans and artists.
Cryptocurrencies are helping decentralize governance. Nothing is perfect besides maybe the whole universe. The rest then would only be small part of a bigger perfect whole. No cryptocurrency is perfect and not systems of governance are perfect either.
https://steemit.com/liberty/@teamsteem/thank-you-dan-larimer-you-are-a-great-mentor