Came through this short explaination for the lay man.
Makes it clear.
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But let's say he wanted to alter block 90. If he had a supercomputer, he would've potentially outrun all the people before they've finished block 91.
Is that theoretically possible?
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No its not possible. At the hash power required to mine one block is way to high for a single person or entity to supply in the block time of 10 min. Highly impossible.
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Ok, that sounds pretty relieving :)
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