Just found this on the web. Thought I will share with you guys...if its true..it is not at all good for all miners. Please read and confirm if its true.
http://www.antbleed.com/-------------------------
Antbleed is a backdoor introduced by Bitmain into the firmware of their bitcoin mining hardware Antminer.
The firmware checks-in with a central service randomly every 1 to 11 minutes. Each check-in transmits the Antminer serial number, MAC address and IP address. Bitmain can use this check-in data to cross check against customer sales and delivery records making it personally identifiable. The remote service can then return "false" which will stop the miner from mining.
