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. 

MUSL officials initially suspected fraud or a reporting error. However, all 110 winners had played numbers from fortune cookies made by Wonton Food Inc. of Long Island City, New York. The factory had printed the numbers "22, 28, 32, 33, 39, 40" on thousands of fortunes. The "40" in the fortune did not match the Powerball number, 42. None of the employees of Wonton Food played those numbers; at the time, the closest game member was Connecticut.[40] Since the ticket holders had won as result of a coincidence rather than foul play, the payouts were made.[41]

Remember, the advertised Mega Millions jackpot is the annuity jackpot, which means it's the amount that you would receive if you were to opt for the money to be paid out over 29 annual payments (plus a one-off initial payment). For example, for an advertised jackpot of $200 million, the initial payment would be approximately $3 million, with future payments growing to as much as $12.4 million per annum. However, almost all jackpot winners take the cash option that is paid in one lump sum that, on average, is 60% of the advertised jackpot.
The minimum jackpot prize is a $15 million annuity disbursed in 30 payments over 29 years which is something many people would elect to do.The 30 annuity payments are not equal but based on an increasing rate schedule. For example, the first annual gross annuity payment on the base $15 million jackpot would be approximately $267,000 while the final payment would be approximately $834,000.
Lotto America is an American multi-state lottery game that began in 2017. It is operated by the Multi-State Lottery Association (MUSL). It takes its name from the original Lotto America, offered from 1988 to 1992. Lotto America was re-launched by 13 state lotteries on November 12, 2017. Plays are $1 each (or $2 with the All-Star Bonus option; see below.) Lotto America replaced the scandal-tarred Hot Lotto game; each of the 13 members of Lotto America offered Hot Lotto when it ended on October 28, 2017.
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]

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 January 15, 2012, the price of each basic Powerball play doubled to $2, while PowerPlay games became $3; the minimum jackpot doubled to $40 million.[13] A non-jackpot play matching the five white balls won $1 million. The red balls decreased from 39 to 35.[14] The drawings were moved from Universal Studios Orlando to the Florida Lottery’s studios in Tallahassee. Sam Arlen served as host, with Alexa Fuentes substituting.
Assuming that you have chosen an online lottery company that physically purchases tickets online. How you play Powerball online is the following; Firstly, pick whether you want to buy group Powerball tickets online or single tickets. Almost all online lottery ticket providers offer the player to buy group tickets in addition to single ticket purchases. An online group game ticket in the Powerball is the same concept as a work syndication for the lottery, only nowadays thanks to the wonders of the internet, you don’t have to rely on the people in your vicinity – you can join a syndicate that is made up of hundreds, if not thousands of people scattered all across the globe. 
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