I think I know how multiple accounts are detected, but I am not going to say it because once people know the detection method, they can find a way around it. Anyway, my brother is getting started in the Cosmere; he has read some books and is getting hooked. Sometime soon, probably as a Christmas present, I will introduce him to this, the 17th Shard. Once he has an account, I don't want his account to be mistaken as a duplicate account for myself, or vice versa. Is there a way to ensure that something like this doesn't happen? Others can offer input, but I feel like a staff member such as @Ookla the Editor or Chaos would be best suited to answer.