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  [### Fork choice by (block, slot) pair

 ](/news/fork-choice-block-slot-pair) February 12, 2021 

 Proposed fork choice changes for (approximately) simultaneous deployment with HF1. By Ethereum Foundation 

 

 

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   [### Why Harvard Research on a Low-Profit Tezos Attack Matters for Proof-of-Stake

 ](/news/why-harvard-research-low-profit-tezos-attack-matters-proof-stake) January 08, 2020 

 A recent academic study says Tezos is threatened by “selfish mining,” providing a valid attack model for other live and up-and-coming proof-of-stake (PoS) cryptocurrencies. By William Foxley 

 

 

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