<p>This proposal aims to upgrade the Snowbridge <a href="https://etherscan.io/address/0x27ca963c279c93801941e1eb8799c23f407d68e7">Gateway</a> contract on Ethereum, which is remotely governed by OpenGov utilizing Snowbridge itself as a cross-chain governance bridge.</p>
<h1>New Features</h1>
<p>The upgraded gateway supports new user-facing features:</p>
<ul>
<li>Bridging Polkadot-native assets such as DOT to Ethereum</li>
<li>Bridging native Ether from Ethereum to Polkadot without using the WETH ERC20 contract as a wrapper.</li>
</ul>
<h1>Technical Details</h1>
<p>This proposal will update the Gateway proxy at <a href="https://etherscan.io/address/0x27ca963c279c93801941e1eb8799c23f407d68e7">0x27ca963c279c93801941e1eb8799c23f407d68e7</a> with a new implementation contract at <a href="https://etherscan.io/address/0x4a4559CCD9195C3CABBd4Da00854A434E8dd2Ea3">0x4a4559CCD9195C3CABBd4Da00854A434E8dd2Ea3</a>.</p>
<p>This contract was built and deployed using:</p>
<ul>
<li>Repository: <a href="https://github.com/Snowfork/snowbridge">https://github.com/Snowfork/snowbridge</a></li>
<li>Commit: 2bc718fb07786e47c945b4ecec4ddc6ed4c0eaeb</li>
<li>Command: <code>cd contracts; scripts/deploy.sh scripts/upgrades/polkadot/DeployGateway202502.sol</code></li>
</ul>
<h1>Testing</h1>
<p>The upgrade proposal was extensively tested using simulations on forked instances of both Polkadot and Ethereum mainnet. This was done using Chopsticks and Foundry for Polkadot and Ethereum respectively.</p>
<p>Since the Ethereum side of snowbridge has no fallback governance or centralized escape hatches, it is critical to ensure that the upgrade does not affect the ongoing viability the gateway. In this regard, the fork tests in <a href="https://github.com/Snowfork/snowbridge/blob/main/contracts/test/ForkUpgrade202502.t.sol">ForkUpgrade202502.t.sol</a> verify that cross-chain signalling is preserved.</p>
<h1>Audits</h1>
<p>The Ethereum contracts were audited at revision <code>cb05e1f8bf7018dfca42a8d93d73826a97c99100</code>, which includes the features described above. The audit report is still undergoing a QA process and will only be published some time later. We can provide a provisional audit report on request.</p>

This proposal aims to upgrade the Snowbridge [Gateway](https://etherscan.io/address/0x27ca963c279c93801941e1eb8799c23f407d68e7) contract on Ethereum, which is remotely governed by OpenGov utilizing Snowbridge itself as a cross-chain governance bridge.

New Features
============

The upgraded gateway supports new user-facing features:

*   Bridging Polkadot-native assets such as DOT to Ethereum
*   Bridging native Ether from Ethereum to Polkadot without using the WETH ERC20 contract as a wrapper.

Technical Details
=================

This proposal will update the Gateway proxy at [0x27ca963c279c93801941e1eb8799c23f407d68e7](https://etherscan.io/address/0x27ca963c279c93801941e1eb8799c23f407d68e7) with a new implementation contract at [0x4a4559CCD9195C3CABBd4Da00854A434E8dd2Ea3](https://etherscan.io/address/0x4a4559CCD9195C3CABBd4Da00854A434E8dd2Ea3).

This contract was built and deployed using:

*   Repository: [https://github.com/Snowfork/snowbridge](https://github.com/Snowfork/snowbridge)
*   Commit: 2bc718fb07786e47c945b4ecec4ddc6ed4c0eaeb
*   Command: `cd contracts; scripts/deploy.sh scripts/upgrades/polkadot/DeployGateway202502.sol`

Testing
=======

The upgrade proposal was extensively tested using simulations on forked instances of both Polkadot and Ethereum mainnet. This was done using Chopsticks and Foundry for Polkadot and Ethereum respectively.

Since the Ethereum side of snowbridge has no fallback governance or centralized escape hatches, it is critical to ensure that the upgrade does not affect the ongoing viability the gateway. In this regard, the fork tests in [ForkUpgrade202502.t.sol](https://github.com/Snowfork/snowbridge/blob/main/contracts/test/ForkUpgrade202502.t.sol) verify that cross-chain signalling is preserved.

Audits
======

The Ethereum contracts were audited at revision `cb05e1f8bf7018dfca42a8d93d73826a97c99100`, which includes the features described above. The audit report is still undergoing a QA process and will only be published some time later. We can provide a provisional audit report on request.

- Problem Statement: Upgrading the Snowbridge Gateway contract on Ethereum for cross-chain governance.
- Significance: Enhancing the gateway to support bridging Polkadot-native assets and native Ether without using a wrapper.
- Proposed Solution: Update the Gateway proxy with a new implementation contract.
- Expected Outcomes: Improved cross-chain functionality and governance for users bridging assets between Polkadot and Ethereum.

#1468 Upgrade Snowbridge Gateway Contract

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