If that is your threat model then source the parts and build a SeedSigner. Or get an old laptop and rip out the wifi and bluetooth.

nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl

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SeedSigner basically just helps users who are willing to put in a little work build a hardened, single-purpose, inexpensive offline device that is specifically intended for creating and using private keys. 👍

What do you mean by "hardened" in this context?

Still waiting for a release of the Monerosigner

Still waiting for a release of the Monerosigner