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by almavi 1742 days ago
But you won't verify the blockchain and call every node to say "hey! big corp X is cheating". The consensus protocol is what it is and if 51% agree on anything it will go on. We are at the mercy of 4 giants messing with the chain. Also probably simple double spending could be noticed and proven wrong but, for instance, rolling back a transaction would still be possible breaking the immutability of the blockchain.