Is your feature request related to a problem? Please describe.
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It is not safe to keep the seed phrase or private keys on the computer or smartphones.
Describe the solution you'd like
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Need to have an option to user save the seed phrase or private keys encripted on NFC Card or USB device, like a cold wallet integrated with Bitcoin core.
So every time user wants to withdraw Bitcoin, need to have the USB "pendrive" connected on PC or tap the NFC Card.
Describe alternatives you've considered
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I have checked and there is another wallets using this solution.
Additional context
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I already have this working without integration with Bitcoin Core.
