We have long studied this question, and realized that trying to settle someone's territory and establish on it the so-called virtual state - is very problematic, even if you squat one of the thousands of uninhabited islands in the Pacific Ocean, as soon as someone need it - the owner shows up.
But the international maritime law gives an autonomy to the ship in international waters. We have the idea to establish the Maritime Confederation (MARCO), which will be the based on the international maritime law, and the flow of documents will be integrated into blockchain.
I'll tell more about this idea and plans to implement it later in my blog.
So the answer to your question is - time will tell.