TheIrishman
Legendary
Offline
Activity: 1049
Merit: 1006
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April 16, 2014, 07:31:55 AM |
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Each block is stacked on top of the previous one. Adding another block to the top makes all lower blocks more difficult to remove: there is more "weight" above each block. A transaction in a block 6 blocks deep (6 confirmations) will be very difficult to remove.
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