At 74, Cumberland Advisors’ David Kotok has guided wealthy clients through a long career’s worth of bubbles and crashes. Now he’s being inundated with questions about the latest soaring asset to confound investors -- bitcoin.

“Clients bring up bitcoin all the time,” said Kotok. “They think it’s cool. It has the newness, which is attractive to some people, though others would say newness is a risk they don’t want to take.”

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