Let's add a decentralized XMPP proof to your OpenPGP keys.

Add a message to your XMPP vCard

Using a XMPP client that supports editing the vCard (such as Dino and Gajim), append the following message to the About section (make sure to replace FINGERPRINT):

Update the PGP key (basic edition)

First, edit the key (make sure to replace FINGERPRINT):

Add a new notation:

Enter the notation (make sure to replace XMPP-ID):

The XMPP-ID looks something like an email address: user@domain.org.

Save the key:

Upload the key to WKD or use the following command to upload the key to keys.openpgp.org (make sure to replace FINGERPRINT):

And you're done! Reload your profile page, it should now show a XMPP account.

Update the PGP key (OMEMO edition)

XMPP communication can be end-to-end encrypted with OMEMO. Verifying OMEMO fingerprints is essential to trust your communication and keep it safe from Man-in-the-Middle attacks.

Keyoxide makes the fingerprint verification process easy for all. Add a special identity proof that not only contains your XMPP-ID but also the fingerprints of all your OMEMO keys.

If your XMPP identity proof is verified, a QR code is shown. Anyone can scan this QR code using XMPP apps like Conversations (free on F-Droid) to not only add you as a contact, but also verify your OMEMO keys with the highest level of trust.

Making this identity proof yourself can be a tad difficult when using clients like Gajim, but luckily for us, Conversations can directly generate the proof by going to Account details > Share > Share as XMPP URI. The resulting URI should look something like:

To take advantage of the easy and secure XMPP identity proof including OMEMO fingerprints, follow the basic edition guide above but replace XMPP-ID with the URI obtained through the Conversations app.