How banning 500 and 1000 rupee curb black money

How can we justify that someone never evaded tax as foreign bank don't have statements older than 3 or 4 years. We pay highest tax in the world and this Govt want more tax.

Just like Europe people in India will be moving to Crypto currency, just like Sarkari dpeartments who no common man wants to deal, no one going out of India wants INR with them. Digital age, Crypto currency is best. I even started accepting Bitcoin with my clients 2-3 months back.