Bitcoin, as a medium of payment, has neither been authorized nor been regulated by any central authority in India. Further, no set rules, regulations or guidelines have been laid down for resolving disputes that could arise while dealing with bitcoins. Hence, bitcoin transactions come with their own set of risks. However, given this background, one cannot conclude that bitcoins are illegal as, so far, there has been no ban on bitcoins in India.

https://cleartax.in/s/bitcoins-taxes-india#Is