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I just skimmed through their documents and I saw they use BFT. BFT algorithms are slow (and slower when more nodes are added) so are they using another layer for gaining performance?

Currently the fastest BFT implementation is BFT-SMaRt: https://github.com/bft-smart/library

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BTF is slow depending on how many nodes you're running. generally it can't support more than 100 validators

Moreover, BFT algorithms do not solve BGP in a decentralized, trustless network, consensus remains subjective. Bitcoin relies on proof-of-work to provide objective consensus.

Whitepaper: "We did not consider proof-of-work based protocols due to their poor performance and high energy (and environmental) costs"

Right...

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