It all depends on who stores it and how. I use FaceID on my iPhone.

The data to match the FaceID doesn’t leave my phone although I need to trust Apple on that. If you don’t want to place that trust on Apple then it would be better to use something like Graphene.

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Thanks for the replies. I’m learning the trade offs for privacy vs convenience is a never ending dance.

đź’Ż

And it applies to everything, including Bitcoin and Nostr