* S.Korea to act on illegal, unfair acts in cryptocurrency trade
* Govt says will announce plans to develop blockchain in H1
* Opinion within government still divided, will keep reviewing (Adds detail)
SEOUL, Feb 14 (Reuters) - South Korea said on Wednesday it will take firm action against illegal and unfair acts in cryptocurrency trading after a 280,000 signature petition was sent to the presidential Blue House.
"The government's basic rule is to prevent any illegal acts or uncertainties regarding cryptocurrency trade, while eagerly nurturing blockchain technology," Hong Nam-ki, minister of the office for government policy co-ordination said in a statement.
The petition was made after the justice minister said in January that the government may shut down cryptocurrency exchanges. It demanded that the government never impose unreasonable regulation on virtual currency trading.
The government has to produce an official response within a month for a petition that gathers more than 200,000 signatures.
South Korea, which has become a cryptocurrency trading hub after a market frenzy that attracted even housewives and students, has already imposed some regulations on cryptocurrency trading.
It banned the use of anonymous bank accounts for virtual coin trading as of January 30, but said it does not intend to go as far as shutting down domestic exchanges.
"But, the government is still divided with many opinions ranging from an outright ban on cryptocurrency trading to bringing the institutions that handle the currency into the system," Hong said, adding that the government will thoroughly review the industry within global norms.
South Korea will also develop ways to tax virtual currencies, led by the finance ministry, and should announce measures within the first half of the year to develop the blockchain industry, Hong added. (Reporting by Dahee Kim; Additional reporting by Christine Kim; Editing by Eric Meijer)