Ethereum: How to fix revert problem in universal router?

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I can walk you through the process of troubleshooting the Universal Router rollback issue for Ethereum (UR) with a basenet token sale.

Introduction

The Universal Router is a decentralized bridge that allows you to use external chains, such as Binance Smart Chain or Optimism, to launch token sales on the mainnet. However, this can lead to transaction rollbacks if the contract on the external chain is not configured correctly or if the relay chain contract has issues.

The Rollback Issue

When a token sale uses the Universal Router and triggers a withdrawal from the basenet to the target chain, it can cause a rollback error. This happens because:

• The withdrawal function on the basenet contract expects a specific signature, but the relay chain contract on the external chain provides a different signature.

• The relay chain contract has an issue that prevents the transaction from being confirmed.

Resolving the rollback issue

To fix this issue, you’ll need to modify your Ethereum-based contracts and update the Universal Router configuration accordingly. Here are some steps to follow:

1. Update the base network contract

In the base network contract, add a withdraw function that accepts a specific signature:

function retreat(amount) {
// ...
return { data: '0x...'}; // Replace with the actual signature
}

Then, update your code to call this function and handle any errors:

const { BigNumber } = require('bignumber.js');
const routerAbi = ...;
const baseNetworkContract = new Contract(baseNetworkAddress, routerAbi, 'BaseNetworkContract');
async function retreatTokens() {
try {
const amount = await baseNetworkContract.withdraw(amount);
// ...
} catch (error) {
console.error(error);
// Handle the error and try again
}
}

2. Update Universal Router Configuration

In the Universal Router configuration, update the relayChain configuration to point to the correct contract on the target chain:

const universalRouter = new UniversalRouter({
baseNetworkAddress: '0x...', // Base network address
relayChainAddress: '0x...', // Target chain address
relayChainContract: 'RelayChainContract', // Relay Chain Contract ABI
});

Make sure to replace the addresses and contracts with their actual values.

3. Update the token sale contract

In the token sale contract, update the withdraw function to use the correct signature:

async function retreatTokens() {
try {
const amount = await baseNetworkContract.withdraw(amount);
// ...
} catch (error) {
console.error(error);
// Handle the error and retry
}
}

4. Update the Relay Chain Contract

If you are using a Relay Chain contract, update your withdraw function to use the correct signature:

async function retreatTokens() {
try {
const amount = await baseNetworkContract.withdraw(amount);
// ...
} catch (error) {
console.error(error);
// Handle the error and retry
}
}

5. Test your code

Once you have made these updates, test your code thoroughly to ensure that the rollback issue has been resolved.

Conclusion

Solving the rollback issue on the Universal Router for Ethereum can be a challenge, but if you update your contracts and configuration accordingly, you should be able to resolve this issue and successfully launch a token sale on the base network. Remember to test your code thoroughly after making these updates to ensure everything works as expected.