Although not the most secure, nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl is the most trustworthy of all signing devices. You can always count that something you built yourself will not rug you or ask for your ID.

(It's not the most secure since security entirely depends on how you safeguard the seedQR outside the SS)