I am certainly not an expert in the technical details of biometric protection, but I think that developers will be able to guarantee it. The Gigzi Iris diaphragm scanning hardware device has this capability. But you can learn the details of this device from the developers to be sure of the reliability of such a device with anonymity.
I see. So, I must learn the details to understand the project before doing research to make a better development to the project. Wish you have agreat day.