A currency surging in value at a breathtaking rate this week belongs to no nation and is issued by no central bank. It can be used to buy gold in California, a hamburger in Berlin or a house in Alberta. When desired, it can offer largely untraceable transactions.
The coin in question now has a global circulation worth more than $1.4 billion on paper. Yet almost no one, it seems, knows the true identity of its creator.
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