Federal authorities arrested Avraham Eisenberg in Puerto Rico in December, accusing the 27-year-old trader of manipulating prices on a crypto exchange called Mango Markets and draining more than $100m from the platform.
Mango Markets all but collapsed after Eisenberg withdrew the money on a single day in October, authorities said. Mr. Eisenberg had defended his actions, saying he did only what Mango’s software code made possible.
Prosecutors...
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