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The other miners will not be aware that this malicious miner has find the correct hash(win) since he has not propagate it, so they will still try to find the correct hash and some second later one of them will find it correct and propagate it, then cycle will repeat again without anyone knowing that this malicious miner has win second before the one that has ...


2

The same kind of business trust and legal things that let an exchange or a bank running I suppose. There have been exchanges doing what you said in the past, and they have gotten the same legal pursuit as any other business scamming his clients. Here is some links: https://www.coindesk.com/six-arrested-over-cloned-crypto-exchange-that-stole-e24-million ...


2

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 ...


1

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. ...


1

Segwit does not use a different signature algorithm nor does it change any of the properties of a ECDSA signature. Thus if you find transactions that involve the same public keys and the same R value, then yes, the private key for that public key is revealed. However, what you are looking at is not the R value. In fact, you are not even looking at the ...


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