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Andreas Antonopoulos - 51% Bitcoin AttackA 51% Attack refers to the act of intentionally building a new longest chain of blocks to replace blocks in the blockchain. This attack happens when someone controls more than half (51%) of a blockchain network's mining power. This control allows them to make major. A 51% attack is an attack on a cryptocurrency blockchain by a group of miners who control more than 50% of the network's mining hash rate.