May I know what does the reference of Bitcoin price use in the game so that we can verify if the result showing on the chart is sync since the game offers only low time frame option. I hope that you can add more time frame option in the with custom multiplier in your future updates. I'm addicted right now on Pancakeswap prediction game which same like this but the multiplier depends the on the bet of each side of player so this game more cool than it since you are giving players the freedom to earn more. Keep it up!
They use the average bitcoin price from Coinbase and Binance. You can see this information in their FAQ. I haven't checked the price in Coinbase but I observed it on Binance and noticed that their displayed price always remains $15-$20 higher than Binance price chart. This is like a trading game. Based on the leverage, a bet will stay active for 5 minutes to 1 hour. But you can cash out your bet before the expiration time. BTW, I'm glad to see that they won't charge any fee for the withdrawals.