miguelmota / consensys-zkevm-messenger-l2-to-l1-example

Send a message from L2 ConsenSys zkEVM testnet to L1 Goerli.

ConsenSys zkEVM Messenger L2->L1 Example

Send a message from L2 ConsenSys zkEVM testnet to L1 Goerli.

Example

There's two contracts; L2Contract.sol and L1Contract.sol

The L2 contract has a method sendGreetingMessageToL1 that sends a message form L2 to L1 contract to set a greeting message on L1 contract. It sends the encoded calldata to execute setGreeting on L1 which can only be called if the message was sent by the L2 contract.

Files

• L2Contract.sol
• L1Contract.sol
• deployL2.js
• deployL1.js
• getRelayFee.js
• sendL2ToL1Message.js
• getGreetingOnL1.js

Install

git clone https://github.com/miguelmota/consensys-zkevm-messenger-l2-to-l1-example.git
cd consensys-zkevm-messenger-l2-to-l1-example
npm install

Set Signer

Create .env

PRIVATE_KEY=123...

Make sure private key has funds on both ConsenSys zkEVM testnet and Goerli.

Compile Contracts

npx hardhat compile

Deploy L2 Contract

Command

npx hardhat run --network consensyszk scripts/deployL2.js

Output

L2Contract deployed to: 0x4A6a249Db5C65F4d87f0F962fa9a46cFC442293D

Deploy L1 Contract

Command

L2_CONTRACT=0x4A6a249Db5C65F4d87f0F962fa9a46cFC442293D \
npx hardhat run --network goerli scripts/deployL1.js

Output

L1Contract deployed to: 0x29c514fA55a073EAE67Db285Bde984eB09BC4143

Get Relay Fee

Command

npx hardhat run --network goerli scripts/getRelayFee.js

Output

fee: 0.01

Send L2->L1 Message

Command (replace env vars with your values)

GREETING="hello world" \
L2_CONTRACT=0x4A6a249Db5C65F4d87f0F962fa9a46cFC442293D \
L1_CONTRACT=0x29c514fA55a073EAE67Db285Bde984eB09BC4143 \
npx hardhat run --network consensyszk scripts/sendL2ToL1Message.js

Output

sent tx hash 0xe118d29f573034da2bd5e30bf0b7e5c00af09d550a02e5e3854a82a9420d681d
https://explorer.goerli.zkevm.consensys.net/tx/0xe118d29f573034da2bd5e30bf0b7e5c00af09d550a02e5e3854a82a9420d681d

Get Greeting on L1

Command

L1_CONTRACT=0x29c514fA55a073EAE67Db285Bde984eB09BC4143 \
npx hardhat run --network goerli scripts/getGreetingOnL1.js

Output

greeting: hello world

Send L1->L2 Message

See https://github.com/miguelmota/consensys-zkevm-messenger-l2-to-l1-example

License

MIT @ Miguel Mota