Create the proof
Log in to github.com and click on New gist.
Name the file openpgp.md and put the proof into it (make sure to replace FINGERPRINT and USERNAME).
After creating a public gist, copy the link to the gist.
Add the claim…
The claim looks as follows:
Make sure to replace USERNAME and GIST_ID.
…to a signature profile:
Follow the instructions provided here. The claim should look like:
…to an OpenPGP profile:
Follow the instructions provided here. The notation should look like: