How to get the L1 block number or L1 tx hash by the L2 transaction hash?

[liucan163]

I attempted to retrieve the L1 txHash using the provided method in the SDK, but encountered a failure. Upon inspecting the code logic, I noticed that for my transaction, logs==[], and therefore, I couldn't proceed with the next steps. Could you please help me understand how to resolve this issue? Alternatively, are there other methods to obtain the L1 txHash and L1 block number? Thank you.

• sdk-trace-tx/README
• https://sepolia-optimism.etherscan.io/tx/0xc36006a7203af54a148db0bc6d1a59131cda383a667c9b092e468e775ef4d825

const crossChainMessenger = new CrossChainMessenger({
l1ChainId: 11155111,
l2ChainId: 11155420,
l1SignerOrProvider: l1Provider,
l2SignerOrProvider: l2Provider,
})
console.log('crossChainMessenger====', crossChainMessenger)
const l2TxHash = "0xc36006a7203af54a148db0bc6d1a59131cda383a667c9b092e468e775ef4d825"
const l1Rcpt = await crossChainMessenger.getMessageReceipt(l2TxHash)
const l1TxHash = l1Rcpt.transactionReceipt.transactionHash
console.log('l1TxHash=======', l1TxHash)