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. 
Prizes must be claimed in the jurisdiction where the winning ticket was purchased. Players can generally claim a prize up to $600 at any licensed lottery retailer in the jurisdiction where they bought the ticket. Prizes over $600 can be claimed at some lottery offices, depending on the amount, and also at lottery headquarters. Please contact your lottery with any further questions.

This method specifically has faced criticism recently from a number of lottery organizers such as Camelot, the UK National Lottery organizers who are not happy with companies “selling tickets” (selling bets on outcomes of their established lottery draws) for prices sometimes even cheaper than Camelot themselves sells their tickets. This legal and corporate dispute looks set to continue for the foreseeable future, in the mean time you can continue to buy Powerball tickets online, only now you are aware of the key differences between the two business models. 
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.

To play Lotto America, pick five main numbers between 1 and 52 and one Star Ball from a separate pool of 1 to 10. You can choose your own numbers or ask for a Quick Pick. It costs $1 per line to play, while you can also add the All Star Bonus to your ticket for a small additional fee for the chance to increase any non-jackpot prize. Find out more about how to play Lotto America, and then just pick up a playslip from any participating retailer to take part.
Unlike Hot Lotto, which used a random number generator during most of its run (including the December 2010 drawing whose jackpot was "won" by Eddie Tipton, a MUSL employee), Lotto America is drawn using physical ball machines and numbered balls. One machine draws the five main numbers while another is used to draw the "Star Ball". As of September 1, 2018, none of these drawings have been made available to the viewing public; these drawings are believed to be held in Tallahassee, Florida, even though Florida does not participate in the game.[5]
In California, prize levels are paid on a parimutuel basis, rather than the fixed lower-tier amounts for winners in other Mega Millions jurisdictions. California's eight lower-tier Mega Millions prize pools are separate from those shared by the other 45 lotteries. California's second prize is a "secondary jackpot"; its payout sometimes exceeds $1 million cash, even though California does not offer the Megaplier.[33]

The US Powerball is a standard lottery draw game based and operated from the golden State of California. The US Powerball has been making millionaires and multi-millionaires since its first drawing way back in 1992. With over 25 years of experience in the lottery industry, the Powerball, along with many other State lotteries, has broken through the final glass ceiling and transformed itself from an interstate lottery into a truly international lottery of global reach. 
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