Financing the purchase - accepting money from investors

So I have a friend who would like to invest in the project:

How much really depends on the plan and timing, but the 10k figure we talked about still seems reasonable to me.

Technically speaking it will be through his Estonian company. How exactly do we do it:

I would like to maintain these properties (simple, fair, understandable) while following EU and Estonian law.

BUT:

YC is heavily US Delaware Corp C centric
these financial instruments are for fast-growing startups, the island cannot grow as fast as adding additional AWS instance

Additionally:

IslandDAO / legal