Blockchain is the revolutionary technology behind cryptocurrencies. Thus, all cryptocurrencies are decentralized, backed by blockchain technology, and not governed by centralized authorities. The distributed ledger of the blockchain makes the entire crypto transaction transparent and immutable, ensuring security. Thus, the logic behind blockchain is to prevent any single player from taking control of the network.

However, like every other technology, blockchain is prone to vulnerabilities. A 51% attack is one such risk that happens when an individual or a group controls more than 50% of the network. If a specific group gains that much access to the network, they can alter the blockchain according to them.
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