I’ve wondered the same over on Mastodon a while ago and was told by multiple people that Nostr was just the latest hype pushed by a group of cryptocurrency fans.

https://shop.lnbits.com/product/nostr-signing-device

I mean they already advertise weird hardware on their website.

Otherwise they might have sound technology, I don’t really know. Let’s hope someone that has used nostr will answer in this thread.