But paradoxically, he also admitted that he "doesn't know anything" about digital currencies after saying he would eagerly buy five-year puts on "every one of the cryptocurrencies."
"In terms of cryptocurrencies, generally, I can say with almost certainty that they will come to a bad ending," said Buffett, the chairman and CEO of Berkshire Hathaway.
"When it happens or how or anything else I don't know," he added in an interview on CNBC's "Squawk Box" from Omaha, Nebraska.
"But I know this: If I could buy a five year put on every one of the cryptocurrencies, I'd be glad to do it but I would never short a dime's worth."
While explaining why he wouldn't take a short position, he said he "gets into enough trouble with things I know something about..."