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Blockchains are still considered nascent, in part due to the fact that they’re unable to scale with adoption. Scalability trilemma refers to a situation where a blockchain cannot be scalable, decentralized, and secure at the same time and has to sacrifice one attribute in order to excel at the other two. Proof of Stake is the only solution that’s close to solving the aforementioned problems. POS eliminates the need for heavy machinery by transferring the validating rights to ‘validators’ who own a minimum stake within the network.