http://tzoz3bensgxyzs7da7lpgsn3a74h7hlbm4wa6ytq2tg6ktd57w22vqqd.onion/doc/about/openpgp_keys/index.en.html
Is only used offline, in an air-gapped Tails only communicating with
the outside world through: Plugging the Tails flash media in another operating system to install Tails
in the first place. Plugging other removable media in the air-gapped Tails to send the
public key, secret key stubs, parts of the secret master key, and so on
to the outside world.