cough botnet. I used to work for Ticketmaster and proof of work is one of the layers they use to prevent abuse. It doesn't stop brokers who sell their goods on

cough botnet. I used to work for Ticketmaster and proof of work is one of the layers they use to prevent abuse. It doesn't stop brokers who sell their goods on stubhub, it only slows them down, and makes them spend a lot more CPU time doing it.