working with balance management in a game

Question

I'm working in a online game project, Where users will deposit ETH into their account for playing game.

My problem is, Once a user deposit some ETH into his wallet. Example 0.10 ETH

So how we can track this balance and update user balance into our database, And allow user to play game. So while playing game user's balance will deduct or increase from our database balance not from directly their ETH wallet built into our website.

So how is it possible to track users deposit only once, So same deposit amount can not be grabbed by our code?

How peoples do this kind of stuff?

Answer 1

I understand your question like this. You have a website that allows users to play the games (offcourse they need balance to play). See if the below approach suits you.

1. Allow them to make payment inside your site via metamask. You would receive the txnhash for it. You can then provide a button for the user to click the txnStatus in which you can find the txnStatus and update the user balance in your DB accordingly. Or, you can do a backend timer to checkup to see the txnStatus and update accordingly.
2. Since, its within your website, you can reduce their balances on the backend, once they reach 0, you can block them out.
3. If their balance is increased, provide a withdraw button in which update your db balance, and let the button click execute the contract method via metamask.