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What are the technical differences between Ethereum Classic and Ethereum?

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In order, from the most recent.

  • Missing replay protection differences as well as other differences which have occurred over the intervening months :) – Jeff Coleman Jun 8 '17 at 3:28
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The code itself for Ethereum (non-classic) was modified in such a way that at block 1920000 it moved the ether in all the child DAO's created from The DAO to a withdraw contract. The classic code was not modified. This had the effect of changing the affected accounts' balances on the non-classic fork. Resetting, for example, the balance of the Dark DAO to zero on non-classic.

After block 192000, in a technical sense, the two chains went back to operating as normal, but the balances of the accounts was different.

The follow-on effects of the change is whatever it is. For example, on Classic, the Dark DAO Dick (which is what I call the person who stole the ether) was able to get this ether in his account and spend it however he/she wishes. On the non-classic fork, many people have been refunding themselves from the withdraw contract.

The two forks are, at this point, irrevocably diverged.

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