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The "blockchain trilemma" suggests that blockchains can only achieve two of three essential properties:
Decentralization - No single entity controls the network
Security - Resistance to attacks and fraud
Scalability - Ability to handle high transaction volumes
This theory, popularized by Ethereum founder Vitalik Buterin, has been widely accepted as justification for why blockchains must make trade-offs. It's often cited to explain why PoW blockchains supposedly can't scale.
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