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. 
The October 28, 2017 Mega Millions' format change resulted in the game's first price increase: plays are $2 each ($3 with the Megaplier; up from $1 and $2 respectively); as part of the format change, the "Just the Jackpot" option was introduced to seven of the game's members. The new option is two plays for $3; only the jackpot can be won (or shared) on this wager.[3][4][5]

In Georgia, New Jersey, and Texas, players must choose, in advance, whether they wish to collect a jackpot prize in cash or annuity. Georgia and New Jersey winners can change an annuity ticket to cash should they be eligible for a jackpot share; however, the choice is binding in Texas. The other Mega Millions members allow the cash/annuity choice to be made after winning (usually 60 days after claiming the ticket), although in Florida the 60-day "clock" starts with the drawing in which the jackpot prize was won.
Mega Millions players have the option to activate a multiplier, called Megaplier, in 45 of its 46 jurisdictions; it is functionally similar to Powerball's Power Play; except the latter cannot multiply second prize by 5. (Neither Megaplier nor Power Play are offered in California because its state penal code distinguishes between a "lottery" in which the bank cannot be "broken", and a "banked game" whose bank theoretically could be broken; only a "lottery" was authorized by the state Lottery Act.) By adding $1 to a basic Mega Millions game, to $3, a player has an opportunity to multiply any non-jackpot prize by 2, 3, 4, or 5. The Megaplier is drawn by the Texas Lottery (before the cross-sell expansion on January 31, 2010, it was the only lottery to offer Megaplier), which is drawn by a random number generator (RNG). The odds for each Megaplier possibility are not uniform.[19]
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.

^ Jump up to: a b Prizes are uniform in all Mega Millions jurisdictions, with the exception of California (where all prizes, including the jackpot, are pari-mutuel; payouts are based on sales and the number of winners of each prize tier.) All other Mega Millions members' second through ninth prizes are set amounts, although in rare cases they can be reduced.
*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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