Weekly review 丨 Facebook studies how to prevent long-range attacks on PoS protocol, Filecoin officially launches testnet

This week's academic topic section shared two research papers related to PoS consensus mechanism security topics, one on Tezos' selfish attack, and the other by the Facebook Calibra team's research on PoS protocol long-range attacks.
In the weekly selection of hard-core technical articles, we will also see the content of the new layer 2 solution ZK Sync, the quadratic payment solution, and the zero-knowledge proof algorithm Bulletproofs.
In addition, Filecoin officially launched the testnet last week, and the cross-chain project Cosmos completed the second mainnet upgrade, which is getting closer to the release of its IBC, and the market is about to usher in a new round of public chain launch. test.
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