原推:@mironov_fm There was an ethereum app for signing up for meetups that worked sort of this way: you put down a bond of $N to register. If you show up, you get back
$N * {# of people who registered} / {# of people who showed up}
(so, a little more than $N)
IMO it worked and was fun!
https://twitter.com/VitalikButerin/status/1602776360791191553