Investor Warren Buffett says bitcoin 'not a currency'
"I wouldn't be surprised if it's not around in 10 or 20 years," said the 83-year-old billionaire, whose nickname stems from his investment savvy and his home city of Omaha, in the United States state of Nebraska.
Mr Buffett called the virtual currency, which has no central bank backing and is generated by an automated computer program, "very speculative, a Buck Rogers kind of thing" like the Dutch tulip mania in 1637.