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I mean, why would they need authorization?
We are talking about a huge amount of money and the winner doesn't need to hide his/her identity because they are anonymous to start with. All they have is the winning ticket and unless he/she posted that on his social media account or shouted in their whole neighborhood that he/she won that huge amount, they will never know that he/she won.
It is probably going to be very hard to hide your new wealth from family and friends for a longer period of time. Such huge sums of money are completely life changing and it's just not possible to hide. The problem is that this kind of money is also changing your family and friends. You might think you have a really good friend but I could turn out that he is only after your money. You will never really know if people are with you for your money or because they genuinely like you.
Everything you say is true, the reality is that it is difficult for people who earn large amounts of money to hide from their surroundings. Because
usually lottery winners who have large amounts of money change their lifestyle, they may suddenly purchase a luxury item. That will inevitably
invoke other people's questions, and in the end the person will be provoked into telling the truth that they've won the lottery. Or even because
he was happy to win the lottery, that person immediately told everyone around him. Once the neighborhood knows that the person won the lottery
with a very large amount of money, surely many people pretending to be nice approached him with the intention of borrowing money. Things like
that often happen to lottery winners.