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The Bitcoin blockchain is not absolutely immutable, it is probabilistically immutable. We say this because the history of transactions (the blockchain) is secured by mining power, and mining success is a probabilistic. Given a certain amount of hashpower, we expect that we'll find a block within some certain amount of time - but it is possible to find the ...


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No, as far as we know, Ethereum transactions cannot be reversed. The DAO hack exploited a badly coded smart contract. The smart contract runs on top of Ethereum, so there are two layers involved here: the Ethereum blockchain and virtual machine (EVM) and the smart contracts which run on the EVM. Neither the EVM or the Ethereum blockchain were exploited. ...


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