Proof of stake Boo (PoS Boo)

PoS Boo is a PoS scheme based on PoS Casper.Th Casper scheme improves the most on “POSv3” with the introduction of a risk factor for malicious stakers. The system is progressive in a way that makes it considerably difficult to execute attacks like the 51% attack; you would need a majority of all minted coins, and you will also face the potential to lose them all when launching such an attack. The finality is mainly determined by stake and risk factors,
Pros
hard to execute a attack successfully even with 51% of circulation, 
solves transaction censoring. With PoW, a block miner can “choose” not to mine a block containing certain addresses, thereby censoring that address from the network. Since block creators are chosen at random and validators are global with this PoS scheme, it is really hard to censor addresses from the network (with the added bonus that if you try to force the network, you will most likely lose your stake).
Used in
​SHIELD​

Proof of Stake Time (PoST)

High Interest Proof of Stake (HiPoS)

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Pros

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