Cryptocurrency is digital-based cash among the internet world nowadays. Born from blockchain, this kind of "currency" is blooming in terms of high privacy. Acknowledging that, Nobel Prize-winning economist and Harvard professor Eric Maskin commented that private cryptocurrency is a misallocation.

"The most important application of blockchain so far has been cryptocurrency, and that is a terrible misallocation. In my view, cryptocurrency, at least private cryptocurrency like bitcoin is a mistake," said Maskin.

"Because the public currency like RMB and U.S. dollar are much more useful than private currency. [Public currencies] they preserve the power of central banks to conduct monetary policy. If no one is using the dollar, then the U.S. monetary policy is useless. So I'm worried about cryptocurrency only to the extent that it reduces the use of currencies like RMB or dollar," he added.

He also pointed out that cryptocurrencies could interfere with central banks' monetary policies.

Meanwhile, Maskin supports the idea that blockchain is a technology. He noted that it is one of the exciting developments that have come along in recent years.

"Blockchain can make all sorts of transactions much easier and much more secure. It can also ensure that only the information that people need to have gets transmitted," said Maskin.

"Blockchain is a way for me to guarantee that only what you need to about me gets told. And that's valuable in a world where we're beginning to worry about privacy issues," the professor explained.

Besides, Maskin supports building the country's own digital currencies. With the backdrop of e-payment booming around the world, Maskin said the digital currency can make transaction easier but it won't have all of the unpleasant side effects of these private currencies.

(CGTN's Guan Xin also contributed to this story.)