A big problem I see with Amazon One being used for authentication is that it inherently has weak authentication design. Authentication should be a combination of two or more of the following; something you have, something you know, and something you are. Another security pitfall I see is that once your ‘hand print’ is obtained by ‘hackers’ then there is no way to fix your account. Maybe you can use your ‘other hand’ but then you run out of reasonable options. One thing a user should know before trying Amazon One is that this increases convenience at the expense of security, as is nearly always the case with technology features.