Why Is My Transaction Reverting or Failing?

3 min. readlast update: 01.24.2024


In the world of blockchain and cryptocurrencies, transactions occasionally fail or revert, causing frustration and confusion for users. There are several reasons why a transaction might not be successful, and understanding them can help ensure smoother future transactions.

This article will explore some of the common causes of transaction failures on the Cardano blockchain, including blockchain load, mempool issues, and wallet-related problems.

Blockchain Load

The blockchain is a decentralized ledger of all transactions across a peer-to-peer network. Like any system, it has its capacity limitations. The number of transactions that can be processed within a specific time frame depends on block size and block time. Therefore, during times of high traffic or network congestion, transactions can be delayed or even fail due to an overloaded blockchain.

Mempool Issues

A mempool (memory pool) is like a "waiting room" for transactions. When there are more transactions than can fit into the next block, they wait their turn in the mempool. However, if the mempool becomes full due to a surge in transactions, some transactions may fail. Additionally, if a transaction remains in the mempool for an extended period without being confirmed, it might eventually be dropped, leading to a failed transaction.

Wallet Issues

The problem can sometimes originate from your wallet software. Here are a few potential wallet-related issues:

  1. UTXO issue: On Cardano, we use UTXO's. Think about them as individual smaller wallets inside your wallet. They allow you to do multiple transactions in parallel. If you are in the process of making a transaction and try to make another and they use the same UTXO's, the second transaction may fail.
  2. Insufficient Funds: A transaction will fail if your wallet does not have enough ADA to cover both the transaction amount and the transaction fees. Always ensure your wallet balance can cover these amounts before initiating a transaction.
  3. Address Errors: Transactions can fail if there's an error in the recipient's address. Always double-check the address you're sending ADA to before confirming a transaction.
  4. Outdated Wallet Software: If your wallet software is not updated to the latest version, it may not function correctly, leading to transaction failures. Keeping your wallet software updated can help ensure smooth and successful transactions.
  5. Network Connectivity: A poor or unstable internet connection could interfere with the transaction process, potentially leading to failures. Always ensure you have a stable internet connection when transacting.


Transaction failures or reversals can be quite frustrating, but by understanding their causes, you can help ensure smoother transactions in the future. Always double-check your transactions for errors, ensure your wallet has enough funds to cover the transaction and update your wallet software. In times of network congestion, you may need to be patient as your transaction could take longer to process. If you encounter persistent issues, don't hesitate to reach out to the support team of your wallet or the platform you're using. 

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