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. 
This website is owned and operated by Secure View Services Limited, 3rd Floor Methonis Tower, 73 Archbishop Makarios Avenue, Cyprus. Lucky Enterprises and its associated brands operate as an independent ticket purchasing service and are neither associated with nor endorsed by The National Lottery, MUSL, or Camelot Plc, nor any company that manages any product for which their services are employed.
Ask for the All Star Bonus with your Lotto America purchase! For an extra $1 All Star Bonus purchase you could increase your prize amount (except the jackpot) by 2, 3, 4 or 5. If you match 5 white ball numbers and have purchased the All Star Bonus, you will have multiplied your $20,000 prize to as much as $100,000! The prize payout does not increase if you match 5 and the Star Ball; in that case you win the jackpot!
Play Powerball online by selecting five main numbers from 1-69 and a single Power Ball additional number from a guess range of 1-26. US Powerball winning numbers are selected each Wednesday and Saturday at 23:00 EST*, and your official Powerball lottery ticket could make you the lottery world’s next dollar multi-millionaire! When you buy lottery tickets online with theLotter, you will see a scanned copy in your private theLotter account before every draw. Select your numbers for the next Powerball draw with quick pick, manual selection, or your saved lucky numbers! Learn more about how we purchase official lottery tickets here.
On January 13, 2016, the world's largest lottery jackpot, an annuity of approximately $1.586 billion, was split among three Powerball tickets in Chino Hills, California, Melbourne Beach, Florida and Munford, Tennessee, each worth $528.8 million. Since there is no income tax in Florida or Tennessee (and California does not tax lottery winnings), the cash option after Federal withholdings is $187.2 million each.[32]
^ Jump up to: a b If more than one play wins the jackpot in a given drawing, the prize is divided equally among 5+1 plays. Winners have one year to collect a jackpot share; for other prizes, the deadline also is one year, except in California, where it is 180 days. Other than in and Texas (see below), a jackpot winner has 60 days from either the drawing, or in some jurisdictions, after claiming, to choose cash or annuity. The relative value of actual cash jackpot share fluctuates. Jackpots began at $15 million (disbursed in 30 graduated annual payments if the annuity is chosen); the corresponding cash value fluctuates depending on interest rates.

And of course, if non-US residents are eligible to buy the tickets, they are also eligible to claim the prize money should they win. However, be aware that the rules covering taxes and withholding vary depending on where you live. Countries outside of the United States might have different procedures. If you do win, be sure to consult with a tax professional for more information.
Due to falling sales of Hot Lotto (whose final drawing was October 28, 2017), a new version of Lotto America became available on November 12, 2017; its first drawing was November 15, 2017. Lotto America is available wherever Hot Lotto was offered at the time of its final drawing (except New Hampshire.) Lotto America is drawn on Wednesday and Saturday nights after 11 p.m. ET/10 p.m. CT. For each $1 play, bettors choose five numbers from 1 through 52, and a "star ball" numbered from 1 through 10, or ask for terminal-generated numbers. For an additional $1 per play, the bettor can add the "All-Star Bonus" option, which multiplies non-jackpot prizes by 2, 3, 4, or 5.[1][2][3][4] The minimum Lotto America jackpot is $2 million; however, the game's initial jackpot was $15 million; the 13 members chose to augment the jackpot with funds from Hot Lotto, whose final jackpot was not won.
MUSL and its members accept all investment risk and are contractually obligated and liable to the winner to make all scheduled payments to annuity winners. If a jackpot ticket is not claimed, the funds in the prize pool are returned to members in proportion to the amount they contributed to the prize pool. The members have different rules regulating how unclaimed funds are used.[2]
*a tip to know whether the website you are looking at actually buys lottery tickets online or follows the insurance model is to check the wording that they use. If you see the words “Play” then you can be confident it is a company that has agents and buys your tickets physically, if you see the words “Bet” you can be sure it is following the insurance model and you are placing a bet on the outcome of a lottery.
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