51percentattack

🔒 Security Basics: Understanding Blockchain Attack Vectors
On June 30, 2026, network security remains critical for all 17,419 active cryptocurrencies. A 51% attack occurs when a single entity controls more than half of a blockchain's mining hash rate or staking power, allowing them to reverse transactions and double-spend.
Bitcoin $BTC is virtually immune to 51% attacks due to its massive hash rate. Smaller chains with lower hash rates are more vulnerable. Proof-of-Stake chains like Ethereum $ETH face similar risks through validator concentration — another reason decentralization matters.

📌 Key Takeaway:
Bitcoin's immense hash rate makes it the most secure blockchain — smaller chains face 51% attack risks, highlighting why network security correlates with miner/validator distribution.

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