http://hhldo3tnt5solzj2bwfvh7xm4slk2forpjwjyemhcfrlob5gq75gioid.onion/en/index.html
Your public key isn't like a physical key, because it's stored in the open
in an online directory called a keyserver. People download it and use it,
along with GnuPG, to encrypt emails they send to you.