With fiat money, fraud is committed because of selfish profit motives: the individuals performing the fraudulent actions have everything to gain and nothing to lose if they are not discovered or if they are beyond the reach of the law. With cryptocurrency, a system is produced that no one stands to benefit with fraudulent actions. In fact, they stand to benefit performing non-fraudulent actions instead.
If a greedy attacker is able to assemble more CPU proof-of-worker than all the honest nodes, he would have to choose between using it to defraud people by stealing back his payments or using it to generate new coins. He ought to find it more profitable to play by the rules, such rules that favour him with more new coins than everyone else combined, than to undermine the system and the validity of his own wealth
- Satoshi Nakamoto
To gain 51% of minning power or more, you need huge money! Let's say you have that money! Now, you have 2 options! To mine more than everyone else and earn more Bitcoins than all other minners, or to use that power in order to crash the Bitcoin! I think it is absurd to even discuss about this! Using billions to create that power and then lose everyhting just because you hate Bitcoin! What is even more absurd is that other miners can ignore you and they can continue to mine on the old chain so old chain won't suffer almost anything. The only problem that can happen in that situ headeration is short-term price fluctuation.
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