A cryptocurrencies panel at the Milken Institute Global Conference was more like a cryptobrawl — no punches but a barrage of barbed comments.

“All this talk of decentralization is just bullsh*t,” said Nouriel Roubini, an economist known as Dr. Doom for predicting the chaos of the 2008 financial crisis.

“Everything you just said is irrelevant,” shot back Alex Mashinsky, a blockchain entrepreneur who was an early developer of the Voice over Internet Protocol standard.

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