Add owncast documentation

content/guides/owncast.md

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+# Adding an Owncast proof
+
+Let's add a decentralized Owncast proof to your OpenPGP keys.
+
+[[toc]]
+
+## Update your Owncast server configuration
+
+On your server, add the following lines to the `instanceDetails > socialHandles` entry in the `config.yaml` (make sure to replace FINGERPRINT):
+
+```
+    - platform: keyoxide
+      url: https://keyoxide.org/FINGERPRINT
+```
+
+When not identifying your key by its fingerprint (for example, when using WKD), add the following lines instead:
+
+```
+    - platform: keyoxide
+      url: https://keyoxide.org/EMAIL#FINGERPRINT
+```
+
+## Update the PGP key
+
+First, edit the key (make sure to replace FINGERPRINT):
+
+`gpg --edit-key FINGERPRINT`
+
+Add a new notation:
+
+`notation`
+
+Enter the notation (make sure to update with the domain of the Owncast instance):
+
+`proof@metacode.biz=https://stream.example.org`
+
+Save the key:
+
+`save`
+
+Upload the key to WKD or use the following command to upload the key to [keys.openpgp.org](https://keys.openpgp.org) (make sure to replace FINGERPRINT):
+
+`gpg --keyserver hkps://keys.openpgp.org --send-keys FINGERPRINT`
+
+And you're done! Reload your profile page, it should now show a verified Owncast account.