Tng ewallet and tng card are two seperate system, then tng card read/write is only secured by 8 (or was it 16) bytes password, if u have access to that password (inb4 it's written under the table drawer), u can change d card value easily

Well, if tng doesn't have that userkey (it's not password, i forgot) for authentication, den I'll be worried about their system

Yes, by right, someone in tng should have access to the userkey, who, or how they store that information for security purposes, I've no idea