Tax notices slapped on cryptocurrency investors as trading hits $3.5 billion

India has sent tax notices to tens of thousands of people dealing in cryptocurrency after a nationwide survey showed more than $3.5 billion worth of transactions have been conducted over a 17-month period, the income tax department said.

Tech-savvy young investors, real estate players and jewellers are among those invested in bitcoin and other virtual currencies, tax officials told Reuters after gathering data from nine exchanges in Mumbai, Delhi, Bengaluru and Pune.

Governments around the world are grappling with how to regulate cryptocurrency trading, and policymakers are expected to discuss the matter at a G20 summit in Argentina in March.

India has issued repeated warnings against digital currency investments, saying these were like "Ponzi schemes" that offer unusually high returns to early investors.

But it has not so far imposed curbs on an industry estimated to be adding 200,000 users in India every month.