There is an additional way to verify if they're alts.
This is done by asking the BJ team to verify their accounts by looking at their accounts on the BJ website. Even if they're using a VPN, there are still ways to verify it.
It will violate privacy of users by revealing the identity or IP of accounts made in the casino to the public. Imagine you are in their situation which someone accusing you that connected to other user while the casino will easily reveal your information in public forum.
Even @theymos doesn’t reveal our IP here to determine all alt account which is easier method to verify account connection and its because of our privacy protection.
I gave that suggestion considering the fact both accounts participated in BlackJack’s contest and have to input their BJ username so BJ has every right to make sure contest is fair.