I also visited your site and you are currently offering 50k digex free to registrants, how much is that worth in BTC?
The DIGEX token is currently traded on several crypto exchanges. Its rate to BTC is constantly changing and depends on the market situation. On average now it is 0.00000005 BTC for 1 DIGEX token.
Accordingly, 50000 DIGEX ~ = 0.0025 BTC, at the moment.
Then you should announce it clear that you will not give a btc rewards but its equivalent only on tokens value.
Change it to USD instead of bitcoin value of you are not willing to give btc for prizes.