UN financing

Here is one possibility for UN financing.

In order to forestall problems with property rights over the solar system the
UN owns rights to everything that is in the Sol's solar system other than
Earth. They also maintain research stations in many of the more interesting
places.

Any nation is welcome to use the research facilities owned
by the UN with the caveat that the UN is 1/2 owner in whatever
discoveries/inventions are created.  While this is rather
hard to enforce the UN also gets a cut of anything produced in space and they
also own most of the asteriods which are used to supply resources to Earths
industries. Mars is also used for many industries which require gravity but
are too ecologically damaging, which often include things the politically
influential "Green" party thinks is harmful with little or no evidence.

While the UN has a populace, mostly it is the few people who choose to live in
the inhospitable areas of the Solar System. These people in general are loner
asteriod prospectors or scientists.

Do note that the UN has little/no jurisdiction over Earth itself
out to geosynchronous orbit.

Sound like a basis for reasonable UN financing while leaving it as a fairly
impartial organization?