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. 

Established in 1996, Lottery USA is one of the oldest lottery number results sites on the web. For the past fifteen years we have provided up-to-the-minute lottery results to millions and millions of visitors. Our lottery results are also archived, so if you miss a draw or simply want to check if your numbers were ever winning numbers you can. Plus, we cover all major US lotteries, including Mega Millions, Powerball, New York Lottery, CA Lottery and Hot Lotto.
Powerball numbers are drawn from two sets of numbers, so the odds of winning a prize are calculated by combining the odds for both sets of numbers for all prize levels. The odds for matching just the Powerball are calculated by combining the odds of selecting the Powerball and the odds of not selecting any of the five numbers from the first set of numbers drawn.
Power Play, when it began in 2001, was drawn with a special wheel. In 2006 and 2007, MUSL replaced one of the 5× spaces on the Power Play wheel with a 10×. During each month-long promotion, MUSL guaranteed that there would be at least one drawing with a 10× multiplier. The promotion returned in 2008; the ball landed in the 10× space twice. After being absent in 2009, the 10× multiplier returned in May 2010 (after the Power Play drawing was changed to RNG.) The promotion was extended for the only time, as the 10× multiplier was not drawn until June 12. The second prize 5× guarantee continued; the 10× applied to all non-jackpot prizes, as in previous promotions.
On October 28, 2017, the price of a Mega Millions play doubled, to $2; the first drawing under the current price point was October 31, 2017. The Mega Millions double matrix changed, from 5/75 + 1/15 to the current 5/70 + 1/25.[12] The starting jackpot became $40 million, with minimum rollovers of $5 million. The "Megaplier" option (which again is not offered in California) was retained, with an adjustment to its multipliers. (The final jackpot for the $1 version was $30 million, which was not won; the initial jackpot for the new version would still be $40 million with a jackpot hit.)
Note: As indicated in the instructions, for the purposes of eligibility some countries include components and dependent areas overseas.  If you are a native of a dependency or overseas territory, please select the appropriate country of eligibility.  For example, natives of Macau S.A.R should select Portugal, and natives of Martinique should select France.
In spite of the huge popularity of this lottery draw game it is still an unknown to many that you can buy Powerball tickets online, whether you are in the US or not. To be clear, this doesn’t even mean that you have to be a citizen of the US either. No citizenship & not based in the US? You can still play powerball online and buy lottery tickets online for a number of different lottery draw games. 
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