yoooooo

3 accounts, the last one is the one he is currently using.
http://www.sythe.org/member.php?u=288155
http://sythe.org/member.php?u=288431
http://www.sythe.org/member.php?u=325217


He's from Alaska.

In this thread, TheOne mentions FreeBSD.
http://sythe.org/showpost.php?p=10313567&postcount=6
http://www.sythe.org/showthread.php?p=10283014#post10283014


And here, ice has written multiple guides that mention it:
http://sythe.org/showthread.php?t=1117263
http://sythe.org/showthread.php?t=1122294




On lce's profile, under interests, it says "Pen Testing" which is short for penetration testing.
http://sythe.org/member.php?u=288431
In this post by TheOneAboveAll, he mentions that it is part of his career.
http://sythe.org/showpost.php?p=10313567&postcount=6



Here, on 1ce's profile he mentions being a speaker at blackhat 2011 under interests.
http://sythe.org/member.php?u=288431

In this post, he mentions blackhat 2012.
http://www.sythe.org/showthread.php?p=10283014#post10283014

Here is a list of speakers for BH2011. There's only 42 and it's not something many people do, so it's not like it would be a coincidence.



I know IRC doesn't count as proof, but there's logs if it matters enough. I can maybe get more proof as he posts more. I'm 100% positive it's the same person, I guess it's just about getting proof now..

 

Hammered