stETH on Optimism parameters for Mainnet
Deployment scope
The full list of the contracts in scope is provided in the Lido Multichain section for Optimism.
Levers and access control lists for L1 and L2 bridge endpoints stay the same and correspond to the reference architecture and permissions setup.
This document covers incremental changes proposed with the stETH on Optimism deployment.
Ethereum part
LidoLocator
A new implementation containing the address of a new TokenRateNotifier instance for postTokenRebaseReceiver
TokenRateNotifier
A standalone (non-proxy) contract proposed to plug to the protocol as a new token rebase receiver.
The contract maintains token rate observers that needs to be notified about token rate changes.
With the current setup the only single observer is connected upfront: the OpStackTokenRatePusher contract instance
for pushing the token rate to Optimism.
# Account that is allowed to add or remove pushers.
# set to the be the Lido DAO Agent governance contract
owner=0x3e40D73EB977Dc6a537aF587D48316feE66E9C8c
# Address of Lido Core protocol contract
# corresponds to the stETH token address on Mainnet
LIDO=0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
# Max amount of token rate observers that can be added inside this pusher
MAX_OBSERVERS_COUNT=32
# Current length of observers
observersLength=1
# The initially added `OpStackTokenRatePusher` observer for Optimism
# see https://docs.lido.fi/deployed-contracts/#optimism
observers[0]=0xd54c1c6413caac3477AC14b2a80D5398E3c32FfE
OpStackTokenRatePusher
A standalone (non-proxy) contract to be a receiver for the TokenRateNotifier contract above, and allowing to push an up-to-date wstETH/stETH token rate as a part of the AccountingOracle report processing.
The rate gets pushed to an TokenRateOracle instance on Optimism.
# Address of the non-rebasable token (wstETH) on L1 to deploy the bridge/gateway for.
WSTETH=0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
# Precision for sending stETH / wstETH token rate
# i.e.: `wsteth.getStETHByWstETH(10 ** TOKEN_RATE_DECIMALS)`
TOKEN_RATE_DECIMALS=27
# The address of the `TokenRateOracle` contract on Optimism
L2_TOKEN_RATE_ORACLE=0x294ED1f214F4e0ecAE31C3Eae4F04EBB3b36C9d0
# Beacon Chain (Consensus Layer) genesis timestamp
GENESIS_TIME=1606824023
# Seconds per a single slot according to the Ethereum CL spec
SECONDS_PER_SLOT=12
# Address of the AccountingOracle of the Lido protocol.
ACCOUNTING_ORACLE=0x852deD011285fe67063a08005c71a85690503Cee
# @notice Gas limit for L2 required to finish pushing token rate on L2 side.
# Client pays for gas on L2 by burning it on L1.
# Depends linearly on deposit data length and gas used for finalizing deposit on L2.
# Formula to find value:
# (gas cost of `L2Bridge.finalizeDeposit() + OptimismPortal.minimumGasLimit(depositData.length)) * 1.5`
L2_GAS_LIMIT_FOR_PUSHING_TOKEN_RATE=300000
L1LidoTokensBridge
A new implementation for the previously deployed L1ERC20TokenBridge L1 endpoint proxy contract to be compatible with both wstETH and stETH tokens bridging flows, escrows wstETH on the Ethereum side.
# Address of the L2 token bridge counterpart proxy endpoint for stETH and wstETH.
l2TokenBridge=0x8E01013243a96601a86eb3153F0d9Fa4fbFb6957
# Address of the non-rebasable token (L1 wstETH) to deploy the bridge/gateway for.
L1_TOKEN_NON_REBASABLE=0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
# Address of L1 wstETH (the same as L1_NON_REBASABLE_TOKEN)
WSTETH=0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
# Address of the rebasable token (L1 stETH) to deploy the bridge/gateway for.
L1_TOKEN_REBASABLE=0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
# Address of the L2 non-rebasable token (L2 wstETH) proxy on L2.
L2_TOKEN_NON_REBASABLE=0x1F32b1c2345538c0c6f582fCB022739c4A194Ebb
# Address of the L2 rebasable token (L2 stETH) proxy on L2.
L2_TOKEN_REBASABLE=0x76A50b8c7349cCDDb7578c6627e79b5d99D24138
# Optimism messenger contract `L1CrossDomainMessengerProxy`
# https://docs.optimism.io/chain/addresses#ethereum-l1
MESSENGER=0x25ace71c97B33Cc4729CF772ae268934F7ab5fA1
# Precision for sending stETH / wstETH token rate
# i.e.: `wsteth.getStETHByWstETH(10 ** TOKEN_RATE_DECIMALS)`
TOKEN_RATE_DECIMALS=27
# Beacon Chain (Consensus Layer) genesis timestamp
GENESIS_TIME=1606824023
# Seconds per a single slot according to the Ethereum CL spec
SECONDS_PER_SLOT=12
# Address of the AccountingOracle of Core Lido protocol.
ACCOUNTING_ORACLE=0x852deD011285fe67063a08005c71a85690503Cee
Optimism part
TokenRateOracle
A source of truth contract (proxy and implementation) for wstETH/stETH token rate on the Optimism side. Used for wrap and unwrap on Optimism side, including wstETH internal bookkeeping when bridging stETH back and forth.
# Precision for receiving and storing stETH / wstETH token rate
DECIMALS=27
# Address of the L1 token rate pusher (OpStackTokenRatePusher) instance
L1_TOKEN_RATE_PUSHER=0xd54c1c6413caac3477AC14b2a80D5398E3c32FfE
# Address of L2 token bridge proxy.
L2_ERC20_TOKEN_BRIDGE=0x8E01013243a96601a86eb3153F0d9Fa4fbFb6957
# Optimism messenger contract `L2CrossDomainMessenger`
# https://docs.optimism.io/chain/addresses#op-mainnet-l2
MESSENGER=0x4200000000000000000000000000000000000007
# A time period when token rate can be considered outdated.
TOKEN_RATE_OUTDATED_DELAY=86400 # 1 day due to the regular stETH token rebase cadence
# A time difference between received l1Timestamp and L2 block.timestamp when token rate can be considered outdated.
MAX_ALLOWED_L2_TO_L1_CLOCK_LAG=86400 # 1 day
# Allowed token rate deviation per day in basis points.
MAX_ALLOWED_TOKEN_RATE_DEVIATION_PER_DAY_BP=500 # 500 BP = 5%
# The maximum allowed time difference between the current time and the last received
# token rate update that can be set during a pause. This is required to limit the pause role
# and mitigate potential economic attacks.
OLDEST_RATE_ALLOWED_IN_PAUSE_TIME_SPAN=86400 # 1 day
# The maximum delta time that is allowed between two L1 timestamps of token rate updates.
MIN_TIME_BETWEEN_TOKEN_RATE_UPDATES=3600 # 1 hour
# Minimal sane token rate to accept (sanity check)
MIN_SANE_TOKEN_RATE=10000000000000000000000000 # 0.01 * 10^27
# Maximal sane token rate to accept (sanity check)
MAX_SANE_TOKEN_RATE=100000000000000000000000000000 # 100 * 10^27
# Enable token rate oracle updates
TOKEN_RATE_UPDATE_ENABLED=true
# Roles granting the permission to resume updating rate.
# Optimism Governance Bridge Executor
TOKEN_RATE_UPDATE_ENABLERS=["0xefa0db536d2c8089685630fafe88cf7805966fc3"]
# Roles granting the permission to pause updating rate.
# Optimism Governance Bridge Executor
# Emergency brakes committee
TOKEN_RATE_UPDATE_DISABLERS=["0xefa0db536d2c8089685630fafe88cf7805966fc3", "0x4Cf8fE0A4c2539F7EFDD2047d8A5D46F14613088"]
# Address of the account to grant the DEFAULT_ADMIN_ROLE
# Optimism Governance Bridge Executor
TOKEN_RATE_ORACLE_ADMIN=0xefa0db536d2c8089685630fafe88cf7805966fc3
ERC20BridgedPermit for wstETH
A new implementation for the wstETH (non-rebasable) token deployed on Optimism.
Provides a way to seamlessly wrap/unwrap to stETH and implements new permit signature standards (ERC-2612 and ERC-1271).
# Bridge address that can mint/burn wstETH on L2
bridge=0x8E01013243a96601a86eb3153F0d9Fa4fbFb6957
# Token name for wstETH on Optimism
name="Wrapped liquid staked Ether 2.0"
# Token symbol for wstETH on Optimism
symbol="wstETH"
# Token decimals
decimals=18
ERC20RebasableBridgedPermit for stETH
An ERC-20 compatible contract (proxy and implementation) for the rebasable stETH token deployed on Optimism.
Provides a way to seamlessly wrap/unwrap from wstETH and implements permit signature standards (ERC-2612 and ERC-1271).
# Bridge address that can mint/burn wstETH on L2
L2_ERC20_TOKEN_BRIDGE=0x8E01013243a96601a86eb3153F0d9Fa4fbFb6957
# Token rate oracle on Optimism for wstETH/stETH token rate retrieval upon wrap and unwrap
TOKEN_RATE_ORACLE=0x294ED1f214F4e0ecAE31C3Eae4F04EBB3b36C9d0
# Token rate decimals precision used by the token rate oracle on Optimism
TOKEN_RATE_ORACLE_DECIMALS=27
# wstETH on Optimism address
# stETH on Optimism is 'wrapped' wstETH technically
TOKEN_TO_WRAP_FROM=0x1F32b1c2345538c0c6f582fCB022739c4A194Ebb
# Token name for stETH on Optimism
name="Liquid staked Ether 2.0"
# Token symbol for stETH on Optimism
symbol="stETH"
# Token decimals
decimals=18
L2ERC20ExtendedTokensBridge
A new implementation for the previously deployed L2ERC20TokenBridge L2 endpoint proxy contract to be compatible with both wstETH and stETH tokens bridging flows, mints and burns wstETH on the Optimism side.
# Address of L1 token bridge proxy.
l1TokenBridge=0x76943C0D61395d8F2edF9060e1533529cAe05dE6
# Address of the non-rebasable token (L1 wstETH) to deploy the bridge/gateway for.
L1_TOKEN_NON_REBASABLE=0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0
# Address of the rebasable token (L1 stETH) to deploy the bridge/gateway for.
L1_TOKEN_REBASABLE=0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
# Address of the L2 non-rebasable token (L2 wstETH) proxy on L2.
L2_TOKEN_NON_REBASABLE=0x1F32b1c2345538c0c6f582fCB022739c4A194Ebb
# Address of the L2 rebasable token (L2 stETH) proxy on L2.
L2_TOKEN_REBASABLE=0x76A50b8c7349cCDDb7578c6627e79b5d99D24138
# Optimism messenger contract `L2CrossDomainMessenger`
# https://docs.optimism.io/chain/addresses#op-mainnet-l2
MESSENGER=0x4200000000000000000000000000000000000007