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.
Lottery jackpots are overwhelming played by low-income Americans, studies show. In fact, the lottery jackpot only becomes “progressive” — meaning that high earners spend more on tickets than more than low earners — when the jackpot is at least $806 million or more, according to this study by Emily Oster, currently a professor of economics at Brown University.
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The winner, who has not yet claimed the prize, has 365 days from the draw date to turn in the ticket at one of nine California Lottery District Office locations. The lucky person has two options for payment: A payment plan for about $543 million (before federal taxes) paid out over 29 years or a lump cash sum of $320.5 million (before federal taxes).
Another study looked at winners. In 2015, the Maine Department of Health and Human Services analyzed data from the Bureau of Alcohol and Beverage and Lottery Operations on individuals who won money in the state lottery. Some 4,865 winning tickets of $1,000 or more were cashed in by 3,685 individuals receiving state benefits over the previous five years, reaching $22 million in lottery jackpots of various sizes. So — unless they were an unusually lucky group of people — they likely spent far more than any other group on tickets.
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)." 
The minimum Powerball bet is $2. In each game, players select five numbers from a set of 69 white balls and one number from 26 red Powerballs; the red ball number can be the same as one of the white balls. The drawing order of the five white balls is irrelevant; all tickets show the white ball numbers in ascending order. Players cannot use the drawn Powerball to match two of their white numbers, or vice versa. Players can select their own numbers, or have the terminal pseudorandomly select the numbers (called "quick pick", "easy pick", etc.).
The two different methods, both offer you, the player, the same user experience and the only difference is in the back end of how the online lottery ticket provider works. The two methods that online lottery sites use differ in one key way; They either have agents and employees all over the world that physically purchase tickets on behalf of clients or, the more recent phenomenon is when companies essentially take out an insurance policy on every ticket which is tied to the size of the jackpot. This is the difference between you playing the lottery online and betting on the lottery online*. In the latter option you are, de facto, not playing the US Powerball online but rather you are placing a bet with an insurance company on the outcome of the corresponding Powerball draw.