ConsenSys zkEVM Messenger L1->L2 Example

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

Example

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

The L1 contract has a method sendMessageToL2 that sends a message from L1 to L2 contract to set a greeting message on L2 contract. It sends the encoded calldata to execute setGreeting on L2 which can only be called if the message was sent by the L1 contract.

Files

• L2Contract.sol
• L1Contract.sol
• deployL2.js
• deployL1.js
• getRelayFee.js
• sendL1ToL2Message.js
• getGreetingOnL2.js

Install

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

Set Signer

Create .env

PRIVATE_KEY=123...

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

Compile Contracts

npx hardhat compile

Deploy L1 Contract

Command

npx hardhat run --network goerli scripts/deployL1.js

Output

L1Contract deployed to: 0x909c35f179c7cD151781f151A4d2a75528A8d2Fa

Deploy L2 Contract

Command

L1_CONTRACT=0x909c35f179c7cD151781f151A4d2a75528A8d2Fa \
npx hardhat run --network consensyszk scripts/deployL2.js

Output

L2Contract deployed to: 0x0ef7281E3f746df91A350859271A8220F4B16519

Get Relay Fee

Command

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

Output

fee: 0.01

Send L1->L2 Message

Command (replace env vars with your values)

GREETING="hello world" \
L2_CONTRACT=0x0ef7281E3f746df91A350859271A8220F4B16519 \
L1_CONTRACT=0x909c35f179c7cD151781f151A4d2a75528A8d2Fa \
npx hardhat run --network goerli scripts/sendL1ToL2Message.js

Output

sent tx hash 0x17d307327fea6e42837fb4e2ff0c3f6d2f6d8e95f659ac0cabd5a973c8d9a4f1
https://goerli.etherscan.io/tx/0x17d307327fea6e42837fb4e2ff0c3f6d2f6d8e95f659ac0cabd5a973c8d9a4f1

Get Greeting on L2

Command

L2_CONTRACT=0x0ef7281E3f746df91A350859271A8220F4B16519 \
npx hardhat run --network consensyszk scripts/getGreetingOnL2.js

Output

greeting: hello world

Send L2->L1 Message

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

License

MIT @ Miguel Mota