This sound very easy, do i need to complete an offer before doing the download or i simply download any app and get paid btc.
I have same question.
You'll need to download + open application. I've found that it helps to atleast interact with the app for a few seconds to make sure you get your postback conversion.
Hello there,
Its really easy to get started, let me explain.
First, you need to signup for Coin Bucks here: https://coinbucks.io/dashboard/signup.php
Once you're signed up, simply goto: https://coinplay.mobi and click "Login iOS or Login Android".
Once you're logged in from your mobile device, you will be greeted with all our apps and offers. Once you click an app and install it, open that application.
) the difference is that here you get paid in BTC, while in other android applications you get paid in dollars. 
and when I scroll down looks like the main page covered by loading page 