Ethereum Transaction Error: Contract-Transaction Hash Does Not Match

As a developer using the Protocol Kit to create, propose, and execute Ethereum transactions via your backend, you’re experiencing an issue with a specific error message that’s preventing your application from processing certain types of transactions. Specifically, when attempting to execute transactions on the Ethereum network for tokens like Matic and ZED, you are getting an error stating “Contract-transaction-hash=…” does not match provided contract-tx-hash=”…”.

In this article, we’ll delve into the details of the issue and explore potential solutions to help you resolve it.

What is the Transaction Hash?

Before diving into the error message, let’s quickly understand what a transaction hash is. A transaction hash (txHash) is a unique string that represents the hash value of a transaction on the Ethereum network. It’s used for a variety of purposes, such as verifying transaction integrity and tracking transactions across different block heights.

The Contract-Transaction Hash Vs. Provided Contract-Tx-Hash

To put things into perspective, here are some key differences between the two hashes:

• Contract-transaction-hash (txHash)

  

  : This is the hash value of a specific contract or function call on the Ethereum blockchain.

• Provided contract-tx-hash (txHash): This refers to the hash value of a transaction that was proposed or executed on another contract, but not on the current block.

The Error Message

Given the context of your issue, it seems like there are two separate problems:

• The error message is indicating an inconsistency between the provided contract-tx-hash and the txHash associated with a specific transaction.

• You’re also experiencing issues with transactions for tokens like Matic and ZED.

Potential Solutions

To resolve this issue, we’ll focus on two potential solutions:

Solution 1: Verify Transaction Hashes

First, let’s ensure that you’re using the correct transaction hash values. Here are a few steps to verify your hashes:

• Make sure you’re using the same contract address for all transactions.

• Double-check that the transaction type and function call are correctly identified in your code.

• If you’re using a smart contract or library, review its documentation to ensure it’s generating accurate txHash values.

Solution 2: Update the Ethereum Client Library

Another potential solution is to update your Ethereum client library to use the latest version. This may resolve any issues related to hash generation or compatibility with newer versions of the Protocol Kit.

To update the client library:

• Install the latest version of the Ethereum client library using npm or yarn.

• Verify that you’re running a compatible version by checking the documentation for your specific library and protocol kit.

• Update your code to use the recommended txHash values.

Conclusion

The error message “Contract-transaction-hash=…” does not match provided contract-tx-hash=”…” is an indication of a problem with transaction hashes or the Ethereum blockchain itself. By verifying transaction hashes, updating your Ethereum client library, and reviewing your smart contracts for accuracy, you should be able to resolve this issue and continue processing transactions successfully.

If you’re still experiencing issues after implementing these solutions, please provide more details about your code and environment, and I’ll do my best to assist further.