True, so a coldcard would be a good option for this? Or a nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl ?

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Either are great products do generate a key pair in an airgapped fashion. There are tradeoffs. Seedsigner asks you to do a bit more work, and the cold card can be a fairly technical interface but there are guides for both.