"I think this [crypto] is going to be the biggest bubble of our lifetimes by a long shot," the former Fortress hedge fund manager said at a CoinDesk bitcoin conference.
"To be fair, this is a bubble and there's a lot of fraud mixed in. We look at tons of projects. And some get funded, and they literally look like Ponzi's. There's a lot of froth and fraud in something that's exciting as this."
Novogratz's remarks came right after he gave an aggressive projection for bitcoin: It "could be at $40,000 at the end of 2018. It easily could," he said on CNBC's "Fast Money." And he saw big things for other cryptocurrencies too: "Ethereum, which I think just touched $500 or is getting close, could be triple where it is as well."