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Is there any possibility blockchain will be hacked by 51% attack or something like that?

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We do have a kind of 51% attack, but because we regulate the rate at which nodes join the network, and bias who can join by stake, it would take a lot if stake and a lot of time to achieve it. Taking a lot of time to control the network makes a lot of PoW or PoS attacks impractical, where an attacker wants to suddenly control the network to reverse a transaction or something.