The error Transaction(InvalidChainId) typically indicates that the transaction you're trying to send is targeting a chain with an invalid or mismatched chain ID. This issue often arises when using a private Proof of Authority (POA) blockchain or custom network, where the chain ID must be explicitly set in the transaction.
Here are some steps you can follow to resolve this issue:
1. Check the Network's Chain ID
Ensure that you have the correct chain ID for your private POA network. Each Ethereum-like network has a unique chain ID, and this needs to be specified correctly in the transaction.
To check the chain ID of your private POA network, you can run the following command (if you're using Geth or a similar client):
eth.chainId
This will return the chain ID of the connected network. Make sure it matches the one you have configured in your transaction.
2. Set the Correct Chain ID in Your Transaction
When you sign a transaction, you need to ensure that the chain ID in the transaction is set to the correct value. If you're using a custom or private network, you'll typically need to set this chain ID manually.
For example, in a web3.js or ethers.js context, you can specify the chain ID like this:
With web3.js:
web3.eth.sendTransaction({ from: senderAddress, to: receiverAddress, value: amount, chainId: 12345 // Replace with your network's chain ID });
With ethers.js:
const tx = { to: receiverAddress, value: ethers.utils.parseEther("1.0"), chainId: 12345 // Replace with your network's chain ID }; const response = await signer.sendTransaction(tx);
3. Verify the Provider Configuration
If you're using a custom provider to connect to your private POA network, make sure the provider is correctly configured with the network's chain ID.
For example, if you're using Web3.js, you might have something like this:
const web3 = new Web3(new Web3.providers.HttpProvider('http://localhost:8545')); web3.eth.net.getId().then(console.log); // This should print the correct chain ID
For ethers.js:
const provider = new ethers.JsonRpcProvider("http://localhost:8545"); const chainId = await provider.getNetwork(); console.log(chainId); // Check if this matches your private POA network's chain ID
4. Check the Node's Network Configuration
If you’re running your own private POA network, verify that your node (Geth, Besu, etc.) is configured to use the correct chain ID. You typically define the chain ID when starting the node:
For Geth:
geth --datadir /path/to/data --networkid 12345 --rpc --rpcapi "db,eth,net,web3,personal,miner"
For Besu:
besu --network-id=12345 --rpc-http-enabled --rpc-http-api=ETH,NET,WEB3
Ensure that the --networkid (for Geth) or --network-id (for Besu) matches the chain ID that you're using in your transactions.
5. Confirm the Correct Network in Metamask (if using)
If you’re using Metamask or another wallet, make sure you’ve selected the correct network. The chain ID in the wallet must match the chain ID of the private POA network.
- Go to Settings > Networks in Metamask.
- Add a custom network and ensure the Chain ID matches your private POA network’s chain ID.
6. Sync Issues
If your node is not fully synced or there are network issues, this could also cause problems. Make sure the node is fully synced with the network before attempting to send transactions.
By ensuring the chain ID is correct both in your transaction and in the network configuration, the Transaction(InvalidChainId) error should be resolved.
