@Epic_Null@infosec.exchange
@poller@infosec.exchange It doesn't matter where you store it. The nature of biometrics is the following:
You always have it with you
It is mostly public knowledge
It cannot be changed
This means if you get phished once (for DNA) or have a high enough quality photo/video of yourself posted online, you become forever compromised. That's assuming there are no leaks or vulnerabilities in literally any of the tools that subscribe to this authentication method.
@Epic_Null@infosec.exchange
@poller@infosec.exchange Also you explicitly mentioned blockchain - a storage system intentionally designed to be public.