The operations that began early morning at nine major exchanges in Delhi, Ghaziabad, Gurugram, Pune, Bengaluru, Hyderabad and Kochi were on till last reports came in.
Sources said the taxman has deployed an heavy assortment of software cloning and 'mirror imaging' devices to drain out "complete details" of emails, addresses and correspondence ids of the investors and players from the computers.
They said that the sleuths detected a number of high- networth individuals (HNIs) and customer ids in these databases and prima facie about 20-25 lakh such entities have been traced.
"Out of these, about 8-10 lakh entities would be active for transactions. However, the operations are still on and final findings will emerge later," a senior official here said.
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The surveys, under section 133A of the Income Tax Act, are being conducted for "gathering evidence for establishing the identity of investors and traders, transaction undertaken by them, identity of counter-parties, related bank accounts used, among others", they said.
The trigger for the action is understood to be the huge spike being registered in the value of the bitcoins and other virtual currencies in the recent past in the country.
A huge amount of black money converted into white, post demonetisation, by using bitcoins is also under the scanner of the department.
Earlier this month, there was a spurt in the value of a bitcoin. It rose from under USD 10,000 at start of the year to close to USD 20,000, before a sharp 20 per cent plunge within hours.
Bitcoin, a virtual currency, is not regulated in the country and its circulation has been a cause for concern among central bankers the world over for quite a while now.
The Reserve Bank of India has also cautioned users, holders and traders of virtual currencies, including bitcoins.
The government has also said that it does not recognise crypto currency as legal tender in India as of now.
The committee has submitted its report to the government and it is being examined.
Bitcoins were in news recently after a massive global ransomware attack 'WannaCry' hit systems in over 100 countries.
The cyber criminals demanded a fee of about USD 300 in crypto-currencies such as bitcoin for unlocking affected devices.
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