A 51% attack refers to a potential attack on the stability of the blockchain system.
When a single malicious actor or organization has more than half of the hash power in the network, it has the opportunity to damage the network.
If the attack is successful, the attacker has the opportunity to overthrow the consensus mechanism and engage in unfavourable behaviours, such as spending a coin twice (ie double spending), modifying the transaction sequence, preventing some or all transactions from being confirmed and/or mining
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