I can set up a form page on bb.org where people can fill in their  forum user id ( eg. u=602).
And it will get the bts id and mumble username fields (we have to ask a forum admin to add this one) and adds it to a database.
After that the mumble host or admin can press a button when the hangout is running and a script will check whos online and will save it.
After the hangout is over a host/admin can click on a payout button and it will send out the brownies.
A page would be available on bb.org that shows the past hangouts including the users who were there and if the brownies are sent out.

So at the end a host/admin only has to click two buttons (once during the hangout and once after the hangout) to handle the whole thing.

I remember in LTB that in order to prove participation, on their interviews at some point there was a "magic" word mentioned. they could fill then that "magic" word and they proved that way that they indeed listened..

I encourage all who are interested in forming the best possible community for Bitshares to look at what worked for other communities, in all other cultures, and also beware of what doesn't work. Plenty of anthropology and psychology science reveals what works.

Talking about walls... buy wall at 1776. Funny.