When Alice executes the double spend, bittrex won't shut her account down, they will put the wallet on maintenance. If it happens more than once, the coin in question gets delisted. There is plenty of precedence for delisting PoW coins that are double spent through 51% attack. Alice can then move to a new exchange.
Dan's 51% hashes don't censor Alice, it kills the coin.
You are struggling to defend @dan, but he's not even here defending himself. He's hiding because he knows he is wrong on this issue.
Check this out: Na na na na na na -- @dan you are wrong!
See? No @dan.
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You aren't getting it. Think about how it plays out instead of blindly trying to defend @dan. Let's imagine you are Alice (not the real person but the account). Alice realizes @dan has 51% of the hashes and is trying to "censor" her. I have shown that she can push a transaction through with certainty over a finite number of blocks. Let's say @dan is dead set on killing the chain to stop Alice. Alice sends the entirety of her balance to trex by pushing that transaction through.
Hungry to double her money she tries again after @dan graciously negates her original spend, then she executes a second (double) spend, maybe going so far as to dump her account on bittrex for the second time and transferring all of whatever she dumped into off the exchange. Alice is now 2x rich and out, @dan is wasting gobs of money mining a tainted coin.
Who won from this "censorship"?
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I downvoted you with full weight because you are not working to understand the concepts here and instead you are resorting to nonsense statements like "lets stop turning this into a secret agent movie".
You obviously have no understanding of game theory, strategy, security, probability, or how blockchains work. I'm proving to you that I do because I got this voting power by being a student of all these things. I really recommend learning from someone who knows their shit rather than @dan who is just trying to promote his latest revenue venture with unsubstantiated and erroneous claims.
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All you did was show you can downvote people. I knew this was coming. I don't care.
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You failed right there. The success of an ongoing, persistent, indefinite attack can't rely on the victim's not finding out about it. That is a recipe for a failed attack, and boom Alice is uncensored. It's easy to discover these attacks. Everyone will know something is up when the chain keeps re-organizing every 2+ blocks. They will spot who is behind the 51% attack and identify it as such, with these new 2+ block forks suddenly coming out of nowhere and reorganizing the chain, and possibly causing other havoc, not just to Alice.
The rest of your post is based on this same fallacy, so isn't worth responding to.
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Nope we don't. @dan can't censor Alice. She gets to spend her funds, twice if she is greedy. Downvoted you to make sure my position is clear.
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