"We do not expect any serious repercussions on the projects that we are currently working on," an official at the ICT firm SK Holdings C&C said.

Another official at LG CNS, which is planning to launch financial services based on a blockchain platform, also downplayed the negative aspects of the technology. "We are actually hoping that companies that are developing and applying innovative blockchain-based service models will be spotlighted more," he said.

But others say spinoff businesses may become inadvertent targets.

"We had expected a value-added services market from increased trade of cryptocurrencies," an official from a local IT company said in response. "Now, that has become difficult due to government restrictions."

Shin Min-soo, a professor at Hanyang University, said the restrictions will discourage small and medium-sized businesses from using blockchain to develop new products and services. "The scope and frame of the restrictions need to be made clearer," he said.

Before digital currencies became subjects of rampant speculation, the government supported blockchain as a key technology of the fourth industrial revolution. IT companies have been making investments and enlarging related businesses from last year.

Advisory firm Gartner estimated the blockchain market to reach $10 billion by 2022.

Industry watchers say because of such prospects, the government will not be changing course on blockchain while taking steps to rein in cryptocurrencies. Finance Minister Kim Dong-yeon, while speaking about Thursday's move against virtual money, stressed a "balanced view" of the situation because blockchain is broadly linked with a number of industries, including information security and logistics.

The security industry is actually anticipating a boon as demand grows for information protection.

"If information security guidelines are raised to the same level as those of the financial community, then the field for new kinds of business will get bigger," an industry official said. (Yonhap)