encryption – What’s the purpose of a key hash when you have the fingerprint?

Looking for “Barack Obama” in Ubuntu’s keyserver return these results

For example, take the first search result:

pub rsa2048/86678817fca9987e2d9a3d3ea2437f33d4266cc0 2017-07-08T04:17:08Z

The first line is the key’s fingerprint.

I can obtain the fingerprint of my keys using gpg --list-keys --fingerprint

  1. What is the second line? Why we need a hash if we already have the fingerprint?

  2. How can I retrieve the hash for my keys in gpg?

  3. If my friend calls me to verify that the public key is mine, should I give him the fingerprint or the hash?