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GOOD QUESTION. The speed of closing down the End Blocks # commands take many minutes, similar to bitcoin, which for bitcoin is OK (TEN MINUTES). For any platform that has to have huge scaleability, the promise of most ICO's - they will need hash Block clearances at the rate of - visa/access transactions.....Ehereum will need a very HARD FORK to accomplish this - see my post for more: https://steemit.com/steemit/@davemanchester/a-prediction