OFAC Support into chain

[ghost]

Govt. regulation is coming, building in the ability to block IP's and sanctioned parties from p2p peers natively in code with auto updates.
I realize that we can all do this ourselves using UFW / Maxmind DB etc., but lets face it its a pain in the butt keeping these things upto date.

For those of us that want to be in compliance and not support sanctioned folks it would be a nice feature to have