> Ok, and now what if the two parties are anonymous or one lives in Russia?
> In that case the judge can't do shit.
In the latter case, I'm pretty sure that (even leaving aside other mechanisms that might apply), judges and courts exist in Russia. Agreements where the parties are based indifferent countries have long been a thing, and long been enforceable by courts.
Unmasking anonymous parties, obviously, can be (though it is not always, even where it must be done) a prohibitive burden to legal action, OTOH.
In that case the judge can't do shit.
If you want the protections of courts, there is already a perfectly easy way to do that. And that is to use a real contract.
But if you explicitly do NOT want that, and explicitly DO want code to be law, that is what ethereum is for.
a judge can't take away the crytocurrencies of some anonymous other party.