Metamask: Is it possible for sendTransaction to return an empty hash from MetaMask while isSuccess is true

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Title: The Mystery of Empty Hashes: Can SendTransaction Return an Empty Hash from MetaMask?

Introduction:

As we continue to build and integrate decentralized applications (dApps) into our digital wallets, one common issue that can arise is the return of an empty hash in certain scenarios. In this article, we’ll delve into a potential problem with sendTransaction in Metamask, where sending a transaction might not complete successfully despite the isSuccess flag returning true. We’ll explore what causes this behavior and examine if there are any workarounds.

The Issue: Empty Hashes

When a user attempts to send a transaction using MetaMask, the resulting hash can be empty or indicate that the transaction was not successful. This might seem counterintuitive at first, but it’s essential to understand the context in which sendTransaction returns an empty hash.

For instance, if two users have the same private key and are sending a transaction with different inputs (e.g., 0x123abcde5678901abcdef), MetaMask will return an empty hash. This is because the transaction metadata doesn’t contain the user’s input data, which is required for successful transaction creation.

IsSuccess Flag: A False Positive?

The isSuccess flag in Metamask indicates whether the transaction was successfully executed. However, it seems that this flag might not always accurately reflect the status of the transaction.

While an empty hash might be a clear indication of failure, the isSuccess flag could potentially return true even if the transaction was not successful. This might lead to unexpected behavior or user confusion.

Simplified Example: Code Snippet

To better understand this issue, let’s consider a simplified example using React and Wagmi.

import { useMetaMask } from '@wagmijs/wagmi';

import MetaMaskProvider from './MetaMaskProvider';


function App() {

  const { error, isSuccess, sendTransaction } = useMetaMask();


  if (!error && isSuccess) {

    console.log('Success!');

    sendTransaction({ to: '0x123abcde5678901abcdef', value: 1 });

  }


  return (

    

      {/ error message /}

      {error ? 
Error: {error.message}
 : null}

       sendTransaction({ to: '0x123abcde5678901abcdef', value: 1 })}>

        Send Transaction

      

    

  );

}


export default App;

In this simplified code, if the isSuccess flag returns true and there’s no error message, it might seem that the transaction was successfully sent. However, without checking for the actual return value of sendTransaction, we can’t confirm whether the transaction completed or not.

Conclusion:

The potential issue with empty hashes in Metamask transactions is largely due to the complexities of interacting between the user’s wallet and the underlying blockchain network. While the isSuccess flag provides valuable insight into the success status of a transaction, it might need to be updated or complemented by additional checks to accurately determine whether the transaction was successful.

To mitigate this issue, developers can implement additional logic in their dApps to ensure that the user is informed when a transaction fails. This could involve displaying an error message instead of returning an empty hash.

Workarounds and Solutions:

• Implement additional logic: Users should be informed about any errors or issues related to sending transactions.

• Update isSuccess flag: The isSuccess flag might need to be updated or complemented by additional checks, such as the result of the transaction being rejected by the blockchain network.

• Return error messages:

  Instead of returning an empty hash, dApps can return error messages with information about what went wrong.

ETHEREUM MAKE TRANSACTIONS