Verify crypto casino coin flip game

Job ID: 36069490

Budget: $250 – $750 USD

Theres a game called xFlip on Rollbit dot com. Supposedly its 50/50 odds. I want to see if it can be rigged in any possible way. Bonus points if you can prove it, but hypothetical will work as well.
Related categories: Web Security Software Testing Blockchain Web3.js