Advertisers will have to put a disclaimer while promoting the "highly risky" and unregulated cryptocurrencies from April 1, a self-regulatory body for the industry said on Wednesday.

All virtual digital assets (VDAs), which are commonly referred to as crypto or non-fungible tokens (NFTs), will have to put the disclaimer in a "prominent and unmissable" way in campaigns for products and services, the Advertising Standards Council of India (ASCI) said.

The announcement of the guidelines, done after consultations with industry stakeholders, government and financial regulators as well, comes as the advertising for the controversial products and services is on the upswing.

The government is yet to come out with a law on such assets but has proposed a tax on gains made from such transactions which has been welcomed by the crypto players as a move to legitimise the industry, while the RBI has been firm in calling for a complete ban on such activities saying they are a threat to financial stability.

"Advertising of virtual digital assets and services needs specific guidance, considering that this is a new and as yet an emerging way of investing. Hence, there is a need to make consumers aware of the risks and ask them to proceed with caution," ASCI chairman Subhash Kamath said.

The guidelines say advertisers will have to carry the disclaimer - "crypto products and NFTs are unregulated and can be highly risky. There may be no regulatory recourse for any loss from such transactions" in a prominent way.

A fifth of the advertising space in print or static ad should be devoted to the disclaimer, while in a video, it should be placed at the end against a plain background with a voice over reading out the text at normal speed, the ASCI