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A 51% attack happens when a single person or group accumulates more than 50% of the hash power and obtains control of the whole system. 51% attacks are perhaps the greatest feared danger in the blockchain industry. Miners play an essential role in confirming blockchain transactions, enabling them to grow even further. Phishing attacks on blockchain networks by phishers are on the rise, and this is generating significant problems. Here are the top five blockchain security concerns, as well as their remedies.