* 100% sure that it is a prize competition
* 100% sure that you can solve it only with the blockchain
* still trying to solve it
* one day someone will solve it
Sergio says that the slope in the picture (This is Satoshi)
https://bitslog.com/2013/04/17/the-well-deserved-fortune-of-satoshi-nakamoto/ is caused by restarting the application to mine (wallet) but it is possible that each 'black branch' represents one solution. That would avoid that only one winner gets the whole coins.
Yes, for sure Satoshi is one of the genius people
He would try to distribute the prize but let it still huge.