The only way to make it secure is for users to bring their own wallet. On first connection they would input their wallet ID so monster look can be paid out. Wh

The only way to make it secure is for users to bring their own wallet. On first connection they would input their wallet ID so monster look can be paid out. When a user wants to buy something he needs to make it outside of minecraft, or use a custom minecraft extension that handles the wallet client-side.