Be very careful participating in lottery sites if you are in the US or if they accept bitcoins from US citizens!!!

The United States does not mess around. They don't care where the site is located. Remember Kim.com, they will send more force than an entire 18th century army at these people.

If you gamble on lottery sites you are playing against worse odds than you think.

http://www.justice.gov/olc/2008/state-conducted-lotteries101608.pdf

Also I'm only a student, this is not legal advice. This is simply legal research. If you require more legal research on anything involving bitcoins, let me know. I'll work for bitcoins.

Important part: "Federal law generally prohibits the promotion and advertisement of lotteries in interstate commerce, 18 U.S.C. §§ 1301-1304, 1953(a) (2000 & West Supp. 2008)"