The hardware remote signer is pretty much ready to go. They'll be available as a kit or built device in the lnbits shop soon.
What is this for?
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It's a remote signer for nostr. Your nostr nsec lives on the device and nostr clients ask the device to sign an event that you want to push to relays. It's perfect for using web clients on mobile.
Take a look at the NIP-46 spec for more info.
Very cool!