Enable bridging wstETH to Arbitrum and Optimism

The following is an extension to the proposal posted on the Lido research forum.

The custom bridging contracts for Optimism and Arbitrum native bridges have been developed, audited, and deployed. Both bridges are owned by Lido DAO on L1. This means, no actions can be performed on bridges without explicit Lido DAO approval. On L2s, the bridge contracts are owned by governance bridge executor contracts developed by the AAVE team, audited by Oxorio, and deployed by the Lido team. For security, Emergency Brakes multi-sigs have been set up on Ethereum Mainnet, Optimism, and Arbitrum, following the proposal and the passed snapshot voting.

The addresses of the deployed contracts are:

Arbitrum

Ethereum part

L1ERC20TokenGateway: 0x0F25c1DC2a9922304f2eac71DCa9B07E310e8E5a (proxy) L1ERC20TokenGateway: 0xc4E3ff0b5B106f88Fc64c43031BE8b076ee9F21C (impl)

Arbitrum part

WstETH ERC20Bridged: 0x5979D7b546E38E414F7E9822514be443A4800529 (proxy) WstETH ERC20Bridged: 0x0fBcbaEA96Ce0cF7Ee00A8c19c3ab6f5Dc8E1921 (impl) L2ERC20TokenGateway: 0x07D4692291B9E30E326fd31706f686f83f331B82 (proxy) L2ERC20TokenGateway: 0xe75886DE20dF66827e321EfdB88726e6Baa4b0A7 (impl) Arbitrum Governance Bridge Executor: 0x1dcA41859Cd23b526CBe74dA8F48aC96e14B1A29

Optimism

Ethereum part

L1ERC20TokenBridge: 0x76943C0D61395d8F2edF9060e1533529cAe05dE6 (proxy) L1ERC20TokenBridge: 0x29C5c51A031165CE62F964966A6399b81165EFA4 (impl)

Optimism part

WstETH ERC20Bridged: 0x1F32b1c2345538c0c6f582fCB022739c4A194Ebb (proxy) WstETH ERC20Bridged: 0x92834c37dF982A13bb0f8C3F6608E26F0546538e (impl) L2ERC20TokenBridge: 0x8E01013243a96601a86eb3153F0d9Fa4fbFb6957 (proxy) L2ERC20TokenBridge: 0x23B96aDD54c479C6784Dd504670B5376B808f4C7 (impl) Optimism Governance Bridge Executor: 0xefa0db536d2c8089685630fafe88cf7805966fc3

The proposal

If this snapshot voting passes, the Lido dev team will be entitled to:

1. Enable the L1 deposits on L1 wstETH bridging contracts with the dev team multi-sig.
2. Renounce the “L1 deposits enabler” role from the dev team multi-sig.

Completing the actions listed above would mean bridging wstETH to Arbitrum and Optimism is enabled on the smart contract level. However, Optimism and Arbitrum teams will have to allow wstETH support in their respective bridge UIs. The Lido dev team plans to enable bridging on each network as soon as L2 teams report on readiness.