Belarus will soon become the center of the world center of the chain of blocks.

I really hope so!

Honestly, I would be afraid to keep a purse on the android. The greatest number of viruses is on android. How will the clients' money be protected?

You are right, native Android protection is not good enough. There are two additional layers of protection for your money:

application use known and protected block.io service API for creating wallets and processing payments
we also use Google cloud based logic to guaranty correct payment processing

You can check this logic by yourself on our open source https://github.com/Lipnevich/noxbox