To hack Bitcoin, in the sense of corrupting the ledger of transactions to fraudulently move coins to a specific account, or to make it unusable, would require a node to post an invalid block to the blockchain, and the network to adopt it and continue to build on it. Because nodes have a very low cost of detecting fraud, while the cost of adding a block of transactions is high and continuously rising, and because the majority of nodes in the network have an interest in Bitcoin surviving, this battle is unlikely to be won by attackers, and continues to get harder as the cost of adding blocks
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