Bridge ETH to L2

[karlb]

The current wrapped ETH tokens on Celo are bridged through Axelar and Wormhole (two separate tokens). If we add native bridging, we would get a new ETH token on CELO (and use unwrapped ETH, if possible).

The default token contract for bridged tokens on the L2 is https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/universal/OptimismMintableERC20.sol. If we add debitGasFee and creditGasFee, we could use bridged tokens as gas currencies (see #60).

See

• L1StandardBridge
• L2StandardBridge
• Bridging tutorial, bridging tutorial (custom token)

Tasks

Preview Give feedback

1. Deploy ERC20 token for ETH on L2
2. Bridge L1 ETH to an ERC20 token on L2
3. Bridge ERC20 ETH from L1 to L1 ETH
4. Add test
5. Adapt existing optimism bridging tests