The only way to be sure that what you are buying is “official” is to purchase your tickets from a company that has agents that will purchase in the real world the Powerball tickets online that you have selected. If you are a more trustworthy person and don’t need a scanned copy of your Powerball tickets online then by all means go for an online lottery ticket provider that follows the insurance model.
On Jan 31, 2010, the date of the cross-sell expansion, Mega Millions and MUSL each added lotteries; eight Powerball members added Mega Millions by May. The Montana Lottery joined Mega Millions on March 1. Nebraska added Mega Millions on March 20; Oregon followed on March 28; Arizona joined Mega Millions on April 18; Maine added Mega Millions on May 9; Colorado and South Dakota joined Mega Millions on May 16. The U.S. Virgin Islands joined Mega Millions in Oct 2010.
Never choose all odd or all even numbers. Such combinations (either all ‘odd’ numbers, or all ‘even’ numbers) make up only 3% of prizes won. Most winning Mega Millions tickets are notable for having three ‘odd’ and two ‘even’ numbers. Alternatively, you could choose three ‘even’ numbers and two ‘odd’ numbers, although your chances to win won’t be quite as good. The mega-ball number can be either an ‘even’ or an ‘odd’ number, and is not related in any way to your main (white) ball choices.
Mega Millions' second-largest jackpot, $648 million, was for the December 17, 2013 drawing. Two winning tickets, one each from California and Georgia, were sold. The holder of the Georgia ticket claimed the next morning; they selected the cash option, which amounted to $173,819,742.50 before withholdings. The holder of the California ticket claimed on January 3, 2014. (The California ticket holder received an equal share, but potentially a larger cash-option amount, as California lottery winnings are exempt from state income tax)." 
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Jump up ^ Lotto, Lucy (June 30, 2011). "Powerball Lottery Changes for 2012". WorldLottery.net. Archived from the original on August 23, 2013. Retrieved September 4, 2013. The first and biggest change to the Powerball Lottery is the introduction of the $40 million base jackpot. Now, when the Powerball Lottery jackpot is reset after a win it will start at $40 million, tempting even more players in for those early draws. Another promise, that is sure to be popular with lottery players, is the introduction of more prizes. From January, Powerball players will have even better odds of winning a prize worth at least $1 million, and it’s that fact that may soften the third and biggest ever change. From January 15, 2012, Powerball Lottery tickets are doubling in price, in what is the biggest change to the Powerball Lottery draw since its launch in 1994.
*The 45 lotteries offering the new game are: the Arizona Lottery, Arkansans Lottery, Colorado Lottery, Connecticut Lottery Corporation, D.C. Lottery (District of Columbia), Delaware Lottery, Florida Lottery, Georgia Lottery, Idaho Lottery, Hoosier Lottery (Indiana), Iowa Lottery, Illinois Lottery, Kansas Lottery, Kentucky Lottery Corporation, Louisiana Lottery Corporation, Maine Lottery, Maryland Lottery, Minnesota State Lottery, Missouri Lottery, Montana Lottery, Michigan Lottery, Nebraska Lottery, New Hampshire Lottery Commission, New Jersey Lottery, New Mexico Lottery, New York Lottery, North Carolina Education Lottery, North Dakota Lottery, Ohio Lottery, Oklahoma Lottery, Oregon Lottery, Pennsylvania Lottery, Rhode Island Lottery, South Carolina Education Lottery, South Dakota Lottery, Tennessee Education Lottery, Texas Lottery, Virgin Islands Lottery, Vermont Lottery, Virginia Lottery, Wisconsin Lottery, West Virginia Lottery, Washington Lottery, California Lottery.
Thanks to Giant Lottos, you don’t have to live in the US to play in the USA Mega Millions. Just purchase your USA Mega Millions tickets online at Giant Lottos, choose 5 numbers between 1 and 70 and 1 Mega Number between 1 and 25, and if you match all 6, you’ll be an instant winner! The USA Mega Millions is drawn twice a week on Tuesdays and Fridays, which gives you two chances every week to hit the jackpot.
The other option is to buy single tickets and play alone. Pick your own numbers, play your own tickets and if you win, you win it all! In this scenario, it is advisable to buy lottery tickets online at least 24 hours before the draw will take place. The reason behind this is because in the single ticket scenario, you want to leave enough time for the agents to go to their local store, purchase your ticket, scan your ticket and upload your ticket into your account. If you purchase your Powerball tickets online at the last minute, some online lottery ticket providers will process your payment and if they can’t buy a ticket in time for the draw you wanted, your ticket will be purchased for the following draw. Bear in mind that the nature of a global online lottery with agents scattered around the world is that everyone is working on different time zones. To be sure that your ticket is purchased for the lottery draw you want, ensure that you don’t buy your lottery tickets online at the last minute. This is something that all online lottery players should be aware of as jackpots and odds can change from draw to draw. You need to know that if you are buying Powerball tickets online, which draw your tickets will be entered into.