#98 # [RFC] Update Crosschain Governance Parameters for Avalanche, MegaETH, Soneium, and X Layer

queued

Description

# [RFC] Update Crosschain Governance Parameters for Avalanche, MegaETH, Soneium, and X Layer

Summary

Secure crosschain messaging is an integral part of Uniswap's governance model. Governance votes like protocol fee adjustments are executed by UNI holders on Ethereum Mainnet and must subsequently be relayed to destination chains.

This proposal updates Uniswap's crosschain governance system to accommodate the latest best practices. Specifically, we propose to:

Transition ownership of the Uniswap v2 and v4 contracts on Soneium and X Layer to CrossChainAccount contracts, which we consider to be the current best practice for executing messages from Ethereum Mainnet on the OP Stack
Migrate the entire messaging system for the Avalanche and MegaETH deployments from LayerZero v1 (part of which is being deprecated) to Wormhole

Note that because Uniswap v3 on both Soneium and X Layer is owned by the v3OpenFeeAdapter, which is owned by the CrossChainAccount, we do not need to change the parameter on v3 on these chains.

Specification

Current Configuration - Avalanche and MegaETH

Both chains currently use LayerZero v1 for governance messaging. The OmnichainProposalSender contract exists on Ethereum and sends messages to OmnichainGovernanceExecutor on remote chains. Additionally, there exists a second OmnichainGovernanceExecutor on MegaETH which owns the ProxyAdmin contract administering the PositionDescriptor periphery contract responsible for rendering LP positions as NFT's.

Proposed Configuration - Avalanche and MegaETH

The LayerZero contracts are replaced with the Wormhole bridge infrastructure from uniswapfoundation/Uniswap-Wormhole-Bridge:

UniswapWormholeSender (Ethereum): The existing sender contract already deployed on mainnet will be reused — no new deployment required.

UniswapWormholeReceiver (Avalanche and MegaETH): Uniswap Labs has deployed new UniswapWormholeReceiver contracts on both chains. This proposal will authorize them as the trusted governance executors for each chain. Additionally, the ProxyAdmin owned by the second OmnichainGovernanceExecutor will be unified with under the authority of the UniswapWormholeReceiver on MegaETH.

For a detailed discussion of how Wormhole works, please see this report by the Uniswap Foundation's Bridge Assessment Committee.

Current Configuration - Soneium and X Layer

Proposed Configuration - Soneium and X Layer

Onchain Proposal Spec

Pre-proposal (already completed by Uniswap Labs):

Deploy UniswapWormholeReceiver on Avalanche C-Chain, configured with the Wormhole Core Bridge address for Avalanche and the address of the existing UniswapWormholeSender.
Deploy UniswapWormholeReceiver on MegaETH, configured with the Wormhole Core Bridge address for MegaETH and the address of the existing UniswapWormholeSender.
Deploy CrossChainAccount contracts on Soneium and X Layer

In this proposal (executed if the vote passes):

Execute nine actions:

(Ethereum) Set Layer Zero "trusted remote" to the OmnichainGovernanceExecutor on MegaETH
(MegaETH) Transfer ownership of the protocol from OmnichainGovernanceExecutor to UniswapWormholeReceiver
(Avalanche) Transfer ownership of the protocol from OmnichainGovernanceExecutor to UniswapWormholeReceiver
(Soneium) Transfer V2 ownership from the aliased Timelock to CrossChainAccount
(Soneium) Transfer V4 ownership from the aliased Timelock to CrossChainAccount
(XLayer) Transfer V2 ownership from aliased Timelock to CrossChainAccount
(XLayer) Transfer V4 ownership from the aliased Timelock to CrossChainAccount
(Ethereum) Set Layer Zero "trusted remote" to the second OmnichainGovernanceExecutor on MegaETH
(MegaETH) Transfer ProxyAdmin ownership from the second OmnichainGovernanceExecutor to UniswapWormholeReceiver

Notable Implementation Details:

Regarding MegaETH "trusted remote" configurations: The OmnichainProposalSender on Ethereum must be configured to send messages to the OmnichainGovernanceExecutor on MegaETH, but not the OmnichainGovernanceExecutor on Avalanche. This is due to our OmnichainProposalSender's configuration on initial deployment. The "trusted remote" is Layer Zero's means of defining which sender contracts may interact with which receiver contracts.

Regarding ProxyAdmin: There exists two ProxyAdmin contracts per chain, one for the NonfungiblePositionDescriptor (V3 NFT renderer) and one for the PositionDescriptor (V4 NFT renderer). The ProxyAdmin of the V3 descriptor is owned a different OmnichainGovernanceExecutor than the OmnichainGovernanceExecutor which owns the rest of the protocol (including the V4 descriptor). We are transferring ownership of all of them to the same WormholeReceiver, which necessitates two separate "setTrustedRemote" actions (one for each governance executor) and two separate ownership transfer actions.

Regarding CrossChainAccount: The low level OP-stack chain bridge uses OptimismPortal2. In short, OptimismPortal2's internal details means the protocol on Soneium and X Layer are owned by an "aliased" form of the Timelock address on Ethereum; this alias is derived from adding a standard offset to the Ethereum address. This is an unintuitive system and increases user-error in ownership transitions, so we are migrating to the higher level of abstraction defined by the CrosChainAccount system. This ensures the protocol on Soneium and X Layer are owned by a concrete contract with limits and authority checks from the messages bridged from Ethereum. We already use this system on other OP-stack chains, so this is to update more chains to use it as well.

Next Steps / Timeline

RFC: Jun 26, 2026
Snapshot: ~1 week after RFC
Onchain vote: Following Snapshot, per standard governance cadence

Supporting Documents

For51,519,808 100%

Against0 0%

Abstain4 0%

Quorumreached

Timeline

Pending
Active

block 25,473,536 → 25,513,856
Succeeded
QueuedNow
Executed

Votes (191)

0x11dA…ECdCFor · 15,003,219 UNI

Addresses and claims checked, overal procedural requirement that we need to execute... +1

0x465f…8aA3For · 14,986,062 UNI

0x6d71…75C3For · 8,007,642 UNI

0x4421…448DFor · 5,311,814 UNI

0xA7F6…d555For · 2,891,294 UNI

0x8d07…A265For · 2,301,740 UNI

0x5C04…dC62For · 2,270,288 UNI

0xB933…8Dd1For · 453,493 UNI

0x3FB1…4C8AFor · 254,296 UNI

0x8ABf…441aFor · 7,000 UNI

0x6f9B…8A1dFor · 6,624 UNI

0x1F3D…0591For · 5,833 UNI

0xDbc8…4F28For · 5,407 UNI

0xc5cb…3397For · 3,570 UNI

0x12b3…0832For · 3,017 UNI

0xE93D…E2b5For · 1,813 UNI

0x1B68…eeaDFor · 1,208 UNI

0xB792…89D7For · 1,040 UNI

0x21b3…Fa75For · 1,023 UNI

0xc554…7759For · 1,001 UNI

0xbE4f…7f4cFor · 1,000 UNI

0x4053…4f15For · 500 UNI

0x1106…9FdaFor · 402 UNI

0xE228…13b1For · 112 UNI

0xa829…4153For · 79 UNI

0x7065…dF2DFor · 59 UNI

0x089A…2dFdFor · 51 UNI

I support this proposal. Updating Uniswap's cross-chain governance infrastructure to current best practices improves long-term security, maintainability, and operational consistency. Migrating away from deprecated messaging systems while simplifying governance across supported networks is a prudent step for the protocol's continued expansion.

0xF517…29e5For · 30 UNI

0xFffd…bf5dFor · 20 UNI

0x2F2F…f78AFor · 14 UNI

0xe2bc…F6dbFor · 14 UNI

0xE0E2…5724For · 13 UNI

0x1A9a…2E4aFor · 10 UNI

0x19f6…02ccFor · 10 UNI

0x37B4…D54dFor · 9 UNI

0xc82b…d5C4For · 8 UNI

0x3DDC…05B0For · 8 UNI

0xaD5d…EB18For · 8 UNI

0x4Dd7…257DFor · 6 UNI

0x0151…c3B9Abstain · 4 UNI

0xAa30…2F53For · 3 UNI

0x1962…9811For · 3 UNI

0x870d…44D1For · 3 UNI

0x87Ac…873FFor · 3 UNI

0x0940…76cCFor · 3 UNI

0x1056…8A26For · 2 UNI

0xeF0e…29A2For · 2 UNI

0x1729…b879For · 2 UNI

0xEC66…Ae81For · 2 UNI

0x53Da…c14BFor · 1 UNI

Voting timeline

Proposal actions

Caller

Timelock

0x1a9C…35BC

setTrustedRemoteAddress

Omnichain Governance Proposal Sender

0xeb0B…A9fc

remoteChainId, remoteAddress

remoteChainIduint16: 398
remoteAddressbytes: 0x8819b86ddf592c3aaaa6f9ec7ce1a0f99fc4322c

execute· 0.0100 ETH

Omnichain Governance Proposal Sender

0xeb0B…A9fc

remoteChainId, payload, adapterParams

remoteChainIduint16: 398
payloadbytes: 0x0000000000000000000000000000000000000000000000… (2,562 chars)
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
adapterParamsbytes: 0x000100000000000000000000000000000000000000000000000000000000002dc6c0

execute· 0.0100 ETH

Omnichain Governance Proposal Sender

0xeb0B…A9fc

remoteChainId, payload, adapterParams

remoteChainIduint16: 106
payloadbytes: 0x0000000000000000000000000000000000000000000000… (3,074 chars)
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
adapterParamsbytes: 0x000100000000000000000000000000000000000000000000000000000000002dc6c0

depositTransaction

_value, _gasLimit, _isCreation

_valueuint256: 0
_gasLimituint64: 200000
_isCreationbool: false

setFeeToSetter

_feeToSetter

depositTransaction

_value, _gasLimit, _isCreation

_valueuint256: 0
_gasLimituint64: 200000
_isCreationbool: false

transferOwnership

newOwner

0xe9e05c42

0xe9e05c42

setTrustedRemoteAddress

Omnichain Governance Proposal Sender

0xeb0B…A9fc

remoteChainId, remoteAddress

remoteChainIduint16: 398
remoteAddressbytes: 0x51f9629c1e75af07421e662dbeb2b7dc8dedefd9

execute· 0.0100 ETH

Omnichain Governance Proposal Sender

0xeb0B…A9fc

remoteChainId, payload, adapterParams

remoteChainIduint16: 398
payloadbytes: 0x0000000000000000000000000000000000000000000000… (1,026 chars)
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
adapterParamsbytes: 0x000100000000000000000000000000000000000000000000000000000000002dc6c0

# [RFC] Update Crosschain Governance Parameters for Avalanche, MegaETH, Soneium, and X Layer

Summary

This proposal updates Uniswap's crosschain governance system to accommodate the latest best practices. Specifically, we propose to:

Transition ownership of the Uniswap v2 and v4 contracts on Soneium and X Layer to CrossChainAccount contracts, which we consider to be the current best practice for executing messages from Ethereum Mainnet on the OP Stack
Migrate the entire messaging system for the Avalanche and MegaETH deployments from LayerZero v1 (part of which is being deprecated) to Wormhole

Note that because Uniswap v3 on both Soneium and X Layer is owned by the v3OpenFeeAdapter, which is owned by the CrossChainAccount, we do not need to change the parameter on v3 on these chains.

Specification

Current Configuration - Avalanche and MegaETH

Proposed Configuration - Avalanche and MegaETH

The LayerZero contracts are replaced with the Wormhole bridge infrastructure from uniswapfoundation/Uniswap-Wormhole-Bridge:

UniswapWormholeSender (Ethereum): The existing sender contract already deployed on mainnet will be reused — no new deployment required.

For a detailed discussion of how Wormhole works, please see this report by the Uniswap Foundation's Bridge Assessment Committee.

Current Configuration - Soneium and X Layer

Proposed Configuration - Soneium and X Layer

Onchain Proposal Spec

Pre-proposal (already completed by Uniswap Labs):

Deploy UniswapWormholeReceiver on Avalanche C-Chain, configured with the Wormhole Core Bridge address for Avalanche and the address of the existing UniswapWormholeSender.
Deploy UniswapWormholeReceiver on MegaETH, configured with the Wormhole Core Bridge address for MegaETH and the address of the existing UniswapWormholeSender.
Deploy CrossChainAccount contracts on Soneium and X Layer

In this proposal (executed if the vote passes):

Execute nine actions:

(Ethereum) Set Layer Zero "trusted remote" to the OmnichainGovernanceExecutor on MegaETH
(MegaETH) Transfer ownership of the protocol from OmnichainGovernanceExecutor to UniswapWormholeReceiver
(Avalanche) Transfer ownership of the protocol from OmnichainGovernanceExecutor to UniswapWormholeReceiver
(Soneium) Transfer V2 ownership from the aliased Timelock to CrossChainAccount
(Soneium) Transfer V4 ownership from the aliased Timelock to CrossChainAccount
(XLayer) Transfer V2 ownership from aliased Timelock to CrossChainAccount
(XLayer) Transfer V4 ownership from the aliased Timelock to CrossChainAccount
(Ethereum) Set Layer Zero "trusted remote" to the second OmnichainGovernanceExecutor on MegaETH
(MegaETH) Transfer ProxyAdmin ownership from the second OmnichainGovernanceExecutor to UniswapWormholeReceiver

Notable Implementation Details:

Regarding CrossChainAccount: The low level OP-stack chain bridge uses OptimismPortal2. In short, OptimismPortal2's internal details means the protocol on Soneium and X Layer are owned by an "aliased" form of the Timelock address on Ethereum; this alias is derived from adding a standard offset to the Ethereum address. This is an unintuitive system and increases user-error in ownership transitions, so we are migrating to the higher level of abstraction defined by the CrosChainAccount system. This ensures the protocol on Soneium and X Layer are owned by a concrete contract with limits and authority checks from the messages bridged from Ethereum. We already use this system on other OP-stack chains, so this is to update more chains to use it as well.

Next Steps / Timeline

RFC: Jun 26, 2026
Snapshot: ~1 week after RFC
Onchain vote: Following Snapshot, per standard governance cadence