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A 51% attack is a blockchain nightmare.
It’s when an individual or a group takes over > 51% of a blockchain’s hashing power (computational power used while mining)
This gives them major control over the blockchain.
The simple reason behind this:
The longest chain rule ⛓️
Blockchain validates transactions with the longest chain
if two parties are looking to validate a transaction, the longest chain wins.
With this, they can:
But they can’t: