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RE: Why cant you cheat at bitcoin?
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?
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.
Ok, that sounds pretty relieving :)