You know that special extra key you need to enter if you registered to 2 tier security so that if someone gets your account they still shouldn't have the info to get the funds out of your account. That uses an authenticator like authy to make the code to present when needed.
Is there a different word for it in bitcoin?
It's called two-factor authentication commonly mentioned as 2FA.
Aah. Yeah, if you enable 2FA on your AllCrypt.com account you need to enter it to withdraw funds. Nearly impossible for hackers to bypass.