Have the developers been able to account for the increased hashrate to be sure the increase isn't controlled by BCX?
If there were a way to do this, it would be a proof that the privacy of XMR were broken
Afaics conceptually, the decentralized checkpoints would not prevent BCX from stealing wallets if he had an attack on the private keys of the genre I was exploring upthread. If he can take over the chain from a checkpoint forward, the he can see transactions before they are added to the chain, thus if the private key could be cracked, he could double spend the transaction, discarding the original transaction and putting one on the block which pays to himself.
True, checkpoints do nothing against a raw anonymity exploit.
Also true that if private keys could be cracked, transactions could conceivable be crafted in an alternative chain to spend those, ...however the novel distributed checkpoint system could prevent the double spend on the alternative chain, since the miners would not honor that chain, because checkpoint.
Upthread we never showed a way to crack the private keys. All I showed was an idea of how to potentially identify which public key in the ring is the sender in some cases. And from that, I noted it makes some more simultaneous equations available for the private key. Whether those simultaneous equations can be solved faster than factoring a public key is not known to me. If someone knows, afaics they haven't told us in this thread.
Also very true
If it is difficult to speculate about BCX's motivations. It seems he is either bluffing to save his reputation, or perhaps he is attempting to instill some humility in the altcoin space. I dunno.
Perhaps he is waiting for someone to make an insight into the sort of attack that might be possible and fix it, so he would then say his attack was thwarted.
P.S. If I don't reply, it doesn't mean I am ignoring. I may have not come back to read yet.
Also agree with most of your apt distinction between crypto and fiat. The law enforcers may have their own opinions but likely will do nothing unless someone really pushes them to do something AND they see some asset seizure potentials.
This all leaves us about where we started. As yet, we have no evidence of a credible threat.
We do have the beginnings of a theoretical threat, but no complete theory, nor a tested theory and certainly no credible evidence. It is like calling in a bomb threat, but not being able to describe what kind of a bomb it is, or where it might be hidden. There's just not much to be done other than the constant vigilance of standard operating procedure until the theories can be worked through.
If BCX has done that, then we should look forward to BCXcoin in the not too distant future as eager miners/buyers. That would be a win too, just an unexpected one