So can I have a little ring that's BLE and it has a button (not physical, but react to tap) and if my phone makes a request for signing and I press the ring in the next 5 seconds, it signs?

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Not sure the BLE rings would have enough program memory to hold the library required to sign it unfortunately. But you can have a separate device like the LilyGo T-Display-S3 that holds your private key so your apps don’t need it or ever see it.