But that doesnt explain why you would need to know who future signers are. It only says that you would need to calculate the 1440th generationSignature and pre-empt it by creating an account with a key-pair that would cause your hit to be lower than everyone elses targets right? how do future signers effect that situation?
Output of the last digest depends on ur public key and generating signature of previous block. It's deterministic but still can't be guessed. Look at this example:
Alice signs block 1 - signature is A
Bob signs block 2 - signature is Digest(A + Bob_public_key)
Charlie signs block 3 - signature is Digest(Digest(A + Bob_public_key) + Charlie_public_key)
See? U can choose any Charlie_public_key but without knowing Bob_public_key in advance it gives no advantage at all.
