So what is to prevent the original developer from selling more coins from the premine as we speak? Are you rolling back the block-chain to some point in the past or what, I don't get it?
The new wallet already voided his coins and there are no exchanges now that accept deposits. If he moves his coins around before we release the wallet, all those transactions will be invalid for the people using the new wallet, including the exchanges.
So what is the exact point of time from which transactions on the old block-chain are voided and will not transfer?