[jankoum]

i have no idea what is reddit-AMA style proof is... sorry i didn't get around to making HN account before today.

[zaatar]

A simple tweet from your verified twitter account @jankoum to indicate that your "HN username = jankoum" should suffice.

[cryodesign]

AMA = Ask Me Anything

And people doing these AMAs on reddit usually post a picture of themselves with a sign, see https://www.google.co.uk/search?q=reddit+ama+proof&source=ln...