Block
644220 will determine the amount to be won.
Block
644230 will determine the winner.
"
The sum to be won will first be determined by a block mined on the day of August 18.
50$ if last character of the block is a letter going from A to C (3 possibilities out of 16)
75$ if the last character of the block is a letter going from D to F (3 possibilities out of 16)
100$ if the last character is a number. (10 possibilities out of 16)
Then a block mined a few hours later will determine the winner."
0000000000000000000d03773458bde2af7e0a742663e0aa098af7421fef8f5d
= d