Would it be possible now to create an online "ghost" country, and if so, how would it work?

Imagine a new kind of country, a country with a temporary map that is constantly changing as it’s members go about their day accross the world.

A country with laws, taxes and everything else, yet it only exists online. There are real world benefits for membership, all members get dual nationality, and immigration is never a problem.

Would it be possible to get it to a point where the country has free hospitals and schools around the world, would it be possible defend the country from invasion, and could we make a good life for our members?

The country would need everything a normal country has. If you lose your job you get welfare wired to you, otherwise we cant call it possible.

What kind of problems would the country come across?

Would other countries try to stop it?

Do we have the technology to make it so?