sci-fi shower thought:

private keys based on your DNA, and you can lightly alter your DNA periodically using CRISPR to rotate your keys

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No need for CRISPR.

Lift weights? DNA changed.

Sip a soy latte? DNA changed.

"rotate" is not the right word

Twins

Someone can steal your laundry to get your key

protect your hairbrush like your Priv key