Individuals are sovereign. Blockchains are to serve them.
Show me a sovereign individual. I haven't met any.
I think it's the exact opposite. Individuals have to physically reside somewhere and cannot be sovereign entities in and of themselves (legally). Blockchains don't reside anywhere except in cyberspace and no one nation state should own cyberspace.
Aren't corporations considered people? So you could argue that a blockchain is as much a sovereign person as a corporation is.
That argument only works if one assumes governments are corporations since the OP was alluding to it as a governmental body.
If you're asking my personal beliefs then I do not believe governments are corporations. I believe governments are military organizations primarily because that is where their power comes from. You could also say they are police or para-military organizations with religious or ideological motivations in many cases.
It's actually very rare for a government to actually be a corporation. Maybe a mafia organization could be like a corporation with government functions but nation states typically aren't.
If we want to really answer the question as to what a government is by the dictionary then it's just a social structure people use to manage resources, provide accountability, and order.