http://Plasma.io 's "mass withdrawal" defense against block withholding is doomed: it loses the race against fraudulent fund withdrawal, and assuming a reliable way to honestly coordinate the masses is assuming away a bigger problem than the one solved. #Ethereum
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Example attack: I manage much more than my bond. I create a bad block with lots of tiny valid transactions from puppet accounts and one huge invalid transaction from UTXOs I don't own to my recipient account. I register the bad block then race to get that money out.
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