The quest for new forms of money hasn’t gone away. In June of this year, Facebook unveiled Libra, global currency that draws on the architecture of Bitcoin. The idea is that the value of the new money is derived not from the imprimatur of any state but from a combination of mathematics, global connectedness, and the trust that resides in the world’s biggest social network. That’s the plan, anyway. How safe is it? How do we know what libras or bitcoins are worth, or whether they’re worth anything? Satoshi Nakamoto’s acolytes would immediately turn those questions around and ask, How do you know what the cash in your pocket is worth?
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