What are your thoughts and this 72 hour attack? do you think it is a legit concern? is it something different from what you are looking at?
We have not confirmed that private keys can be cracked by this. And some mathematicians are so far skeptical. I have not spent enough time on the private key aspect yet, as I have been more focus on the amplification described below since it is a prerequisite for the private key factoring and it is all I have to prove to collect the 11 BTC.
We have confirmed that sometimes the sender of a ring signature can be determined. But this was always the case due to Sybil attacks. What is new is that I have proposed an amplification algorithm which I think makes a little Sybil attacking a lot more powerful than it was. I believe this is a key ingredient of BCX's threatened attack (but not the only ingredient he needs). But I am having trouble characterizing the algorithm's performance but we are working on it. So it is unsure if I have proven amplification, but I would say it is very likely.
BCX has admitted in the trollbox that he needs a TimeWarp attack to rewind the blockchain and spend the private keys he cracks. He claims he has that TW attack and he also thinks he can crack the private keys. But we have not yet figured out either of those two things. And we are skeptical (well lets say they are skeptical and I am not sure what I think, I'm too sleepy).
So all in all, I think we will find a solution within the 72 hours.
If nothing else, they can set ______ ( I am so sleepy I can't remember the term for locking the history of a blockchain at a certain block forward). Mental block due to sleep deprivation.
Edit: a checkpoint