choose some of your friends and ask them to create an account on this site and then deposit cryptocurrencies and start playing, it can be sports betting and preferably ask your friends to bet on tennis.
To be honest, I don't know anyone who likes betting, if someone like that is among my friends, they rather like to play not online but in classic land-based casinos.
On the other hand, I don't know why I should prove anything? And even if I did, I'm sure no one would believe me.