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Definitely. Although I don't think I would recommend incorporating any blockchain company as a taxable US corporation unless you had a very, very good reason.

No one can invest if they don't form some sort of legal entity. Or at least, only investors willing to invest on nothing more than a handshake can invest until there is legal formation.

Yes, but there are other, much friendlier countries in which to incorporate.

Ah, yes, definitely.