Oops. Miss-typed about the off-line signers. Meant to write the nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl project, which additionally, is a DIY project cheap and pretty secure you could buy yourself but no much more a hundred bucks. 🤙  https://seedsigner.com/