Thank you, guys, for ideas, we will think them over.
Adding another step for checking the secret key sounds really reasonable.
JeromeTash, the account secret key is not the same as private keys. If clients see the seed phrase, they may try to use it in another wallet and that may cause some confusion. However, when they see the secret key, they will remember that it is for a Nummix account.
SFR10, we called it anonymous because we never ask for a user's id or passport and anyone can send and receive crypto even without giving their email.