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from where and how to only having blockchain technology and easy to and sell ( encashment), I know about and there is exchange in India.

Bter.com is a exchange platform which supports , BTC, litecoin, LTC, FTC, feathercoin namecoin, ppcoin, terracoin, freicoin, NMC, TRC, FRC, PPC trading.

https://en.wikipedia.org/wiki/Currency

https://en.wikipedia.org/wiki/Currency_substitution

Cryptocurrency – Wikipedia