Node categorization and trust models

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Vitalik Buterin defined medium nodes as those trusted on an n/2-of-n basis, including actors such as staking attesters and FOCIL participants

Vitalik Buterin defined light nodes as nodes that verify chain correctness and availability and access data privately, assuming one honest heavy node exists

Vitalik Buterin defined heavy nodes as nodes trusted on a 1-of-n basis and responsible for block construction and proof generation

Vitalik Buterin placed FOCIL in the medium category, noting it requires widespread honest participation for timely inclusion

Vitalik Buterin introduced a framework that classifies Ethereum nodes into three types: light, medium, and heavy

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