Kevlar

Kevlar is a CLI tool to run a light client-based RPC Proxy for PoS Ethereum. Kevlar can be used to make your Metamask or any RPC-based wallet completely trustless! Kevlar first syncs to the latest header of the beacon chain and then starts an RPC server. This local RPC server can be added to MetaMask or any other RPC-based wallet. Every RPC call made by the wallet is now verified using Merkle Inclusion proofs to the latest block header. Currently Kevlar supports two kinds of sync methods: the Light Sync based on the light client sync protocol specified by the Ethereum Specification and the Optimistic Sync (which is 100x faster than Light Sync) based on construction from the research paper Proofs of Proof of Stake in Sublinear Complexity.

Start the RPC Proxy

npm i -g @lightclients/kevlar
kevlar

The RPC is now available at http://localhost:8546. Add this local network to MetaMask.

kevlar --help
Options:
      --help        Show help                                          [boolean]
      --version     Show version number                                [boolean]
  -n, --network     chain id to start the proxy on (1, 11155111)        [choices: 1, 11155111]
  -c, --client      type of the client          [choices: "light", "optimistic"]
  -o, --provers     comma separated prover urls
  -u, --rpc         rpc url to proxy
  -p, --port        port to start the proxy                             [number]
  -a, --beacon-api  beacon chain api URL

Build Locally

Clone the repo and perform the following commands

yarn install
yarn build

Run Server

cp .env.example .env
yarn start

Deploy Server to Heroku

bash src/provers/light-optimistic/deploy-heroku.sh <heroku-app-name>

Deploy to Docker

docker run -p 8546:8546 --name kevlar shresthagrawal/kevlar
curl -X POST --header "Content-type: application/json" --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' http://localhost:8546/