Cryptocurrency has found its hero in Mr. Trump. And in this unlikely moment of triumph, its most powerful proponent has laid bare the paradox at the heart of this brave new world of “new money.” Crypto was supposed to free us from the chains of government control, but now it is finally revealing what that freedom really means: removing all checks on the power of the wealthy to do what they want, discharged at last from law, supervision and civic obligation — even if the result is autocracy. Mr. Trump, with his thirst for money and power, has in one fell swoop both exposed and embraced the corruption at the heart of digital currencies — a corruption inherited from the libertarian ideals that created them.