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BRIDGE.md

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Quick start for Trustless Ethereum bridge

Run ethereum node

Docs

Build geth and ethkey from source

git clone https://github.com/ethereum/go-ethereum
cd go-ethereum
go build cmd/geth
go build cmd/ethkey

Prepare genesis

Example genesis

{
  "config": {
    "chainId": 4224,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "muirGlacierBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "ethash": {}
  },
  "nonce": "0x0",
  "timestamp": "0x615d5464",
  "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "gasLimit": "0xffffffffffff",
  "difficulty": "0x40000",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "alloc": {
    "90F8bf6A479f320ead074411a4B0e7944Ea8c9C1": {
      "balance": "0x10000000000000000000000"
    }
  },
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "baseFeePerGas": null
}

Specify your accounts in alloc field

Save genesis to soranet.json

Run node

Init chain

./geth --datadir data init soranet.json

Create account

./geth --datadir data account new

Run node

./geth --networkid 4224 \
     --mine --miner.threads 1 \
     --datadir "./data" \
     --nodiscover --http --http.port "8545" \
     --ws --ws.port "8546" --ws.api "eth,web3,personal,net,debug" \
     --port "30303" --http.corsdomain "*" \
     --nat "any" --http.api eth,web3,personal,net,debug \
     --unlock 0 --password ~/work/soramitsu/ethereum/password.sec \
     --allow-insecure-unlock \
     --verbosity 5 \
     --ipcpath "~/Library/Ethereum/geth.ipc"

Prepare bridge

You should run Ethereum and Sora network

Deploy Ethereum contracts

Install node modules

cd ethereum-bridge-contracts
yarn

Prepare dotenv

cp env.template .env

Get private key via ethkey

./ethkey inspect --private <ethereum node folder>/data/keystore/<your key data>

And set to GETH_PRIVATE_KEY var in .env

Deploy contracts

./deploy.sh

Register bridge in Sora

./bridge-scripts/register-bridge.sh

By default it will register local geth ethereum network. If you want to choose different, run the script with relayer bridge register-bridge's parameters (see --help for details). For example,

./bridge-scripts/register-bridge.sh --ropsten

If you want to use ERC20 tokens in bridge you should register that tokens. Example script placed in bridge-scripts/register-assets.sh

Start relaying messages

Relay messages from Ethereum

./bridge-scripts/run-ethereum-relay.sh

Relay messages from Sora

./bridge-scripts/run-substrate-relay.sh <private-key>

Transfer tokens

Now you can transfer tokens through bridge.

Sora to Ethereum

Easiest way is to use ethApp.burn and erc20App.burn via polkadot.js/apps

Ethereum to Sora

Example placed in bridge-scripts/transfer-eth.sh