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Patronum: Kevlar is the first usable light client for Ethereum. Kevlar uses optimistic sync to efficiently sync and starts a local verified RPC server. Kevlar uses Patronum to expose verified RPC server using trusted blockhash. [twitter thead]
LearnP2P: An interactive tutorial to build a chat application using Libp2pJs.
ParaSwap DexLib: A standard library to interact with over hundred decentralized exchanges using a single interface.