Is there any possible way to legally avoid the taxations?
Maybe bitcoin-backed loan. I know that loans (in general) aren't taxable in the US but you may verify it's the same in India.
Legally avoid taxation;
Are you referring to what they call using the taxation loopholes? This is my second time of hearing this in this board. I don't know much of these terminologies because my country is not strict on taxation. Although they have announced cryptocurrency taxation but they have not started yet. If your country uses the PAYE method of taxation, please ensure that you pay your tax.