I disagree with you about Coinb.in being a safe wallet. I do not know what you are trying to do. It is either you are promoting an Indian online wallet or do you really believe that it is really safe. Let us inform the newbies here with the truth please. Online wallets like Coinb.in can never ever be fully safe because you are trusting a third party to hold your coins. Period.
is it really Indian?
anyways it is open source wallet https://github.com/OutCast3k/coinbin/ which seems to be safe to me! but of course it is an online wallet which makes it unsafe because of the fact that you are doing it while connected to the internet and may be on a compromised machine but the code is safe.
p.s. when in doubt just use a known wallet like core to generate a private key offline, ez pz