India will propose a law banning cryptocurrencies, fining anyone trading in the country or even holding such digital assets, a senior government official said in a potential blow to millions of investors piling into the red-hot asset class.

The bill, one of the world’s strictest policies against cryptocurrencies, would criminalise possession, issuance, mining, trading and transferring crypto-assets, said the official, who has direct knowledge of the plan.

The measure is in line with a January government agenda that called for banning private virtual currencies such as bitcoin while building a framework for an official digital currency. But recent government comments had raised investors’ hopes that the authorities might go easier on the booming market.

Instead, the bill would give holders of cryptocurrencies up to six months to liquidate, after which penalties will be levied, said the official, who asked not to be named as the contents of the bill are not public.

Officials are confident of getting the bill enacted into law as Prime Minister Narendra Modi’s government holds a comfortable majority in parliament.

If the ban becomes law, India would be the first major economy to make holding cryptocurrency illegal. Even China, which has banned mining and trading, does not penalise possession.

The Finance Ministry did not immediately respond to an email seeking comment.