How proof work prevents rebuilding of blockchain?

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In proof of state, nonce is not that hard to found. So is it possible to tamper a block and rebuild subsequent blockchain? Or proof of stake has some other way to prevent this?

Jul 23, 2018 in Blockchain by Perry
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POS has the same idea as POW. The difference is, instead of computational (CPU/GPU) power, in POS the miners that own the most number of coin would have the power to make changes in the chain. To attack a blockchain network based on POS, the attacker will need to acquire more than 50% of all the coins in circulation.

answered Jul 23, 2018 by Shashank
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