I am new to crypto currency.

Does any one know, if I am buying bitcoin or any other altcoin in one country and I have to relocate to another country due to job relocation.
How the excise duties will work? Do I need to declare it during travel, if Yes how?


I understand that, no body would know at custom, that I have crypto currency on my wallet, but that's not my question.

I want to know, what is the most ethical and legal way of handling it.
What do I do, if someone want to legitimately declare that he is bringing cryptocurrency from one country to another country.


To give it a context. Let's say, the Crypto was bought in USA, and the person bought it, is going to move to India permanently.
Is there be any excise duty applicable on it? If yes, where we can get more details?