Quote from: Vitalik Buterin on January 05, 2014, 07:56:41 PM

Buterin is the cofounder and head writer at Bitcoin Magazine, and is also involved in a number of Bitcoin software projects including pybitcointools, multisig.info, the Bitcoin private key secret sharing utility btckeysplit and a fork of BitcoinJS. He is also a heavy supporter of "cryptocurrency 2.0" applications such as user-issued currencies, on-blockchain identity systems and decentralized exchange, and is now actively working on developing an upcoming next-generation cryptographic consensus network known as Ethereum.

From 'Proof-of-QoS: QoS based blockchain consensus protocol'

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https://www.sciencedirect.com/science/article/pii/S0167404818313774

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Consensus protocols like Proof-of-Stake (PoS) have been proposed to address this challenge. However, these protocols have compromised the fairness by discouraging the ?poorer? participants and allowing ?richest? stakeholders to have full control over the generation of blocks.