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.