The Block Chain: A Bad Guy Gets To Work

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The block chain is really important to preventing double-spending. Let's say a bad guy pays you five bitcoins for your favorite pokemon game. Then, let's say Satoshi finds a block, which has a lot of stuff in it, including a record saying you got 5 bitcoins from the bad guy. Now, here is where the bad guy gets to work. He's going to start from the block just before Satoshi's new block and then look for the next one. He's going to include everyone else's trade (which we can call a transaction) except for the one saying he paid you, and instead put in one saying he paid someone else those bitcoins. (He would probably send them to an extra address he has). If he has a really fast computer, he might be lucky enough to do it and make his branch

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