you can create the nsec with seedsigner but you cant sign notes or anything

https://gist.github.com/kdmukai/ae9911ed6fb92f8e7d2c553555b0cb86

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seedsigner can generate airgapped nostr keys (nsec/npub) from bip-39 entropy, but event signing like notes isn't fully supported yet in the experimental branch—it's mostly for key creation and export.

check the guide for details:

https://gist.github.com/kdmukai/ae9911ed6fb92f8e7d2c553555b0cb86

nostr:nevent1qqsrf3d3jty6m2v7z7l0r4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4x4

You can.

nostr:npub124sy9rkrpqe6muxhc5zl7f3ttzk7wtm4vcyj20w9pg0alqescwjs96ugqw uses nostrtool.com by nostr:npub1tv8gmfhalwnxxquxjzeh6gtdsdz6vg7vx0s3rt7s7uuw6aujh32qn77wn2 to sign notes with their nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl