# Managing transactions on EVM chains
Transactions on the EVM blockchains are validated thanks to a consensus of miners or validators (depending on the blockchain). They can clear very fast, take a long time, or even fail. This page helps you understand why that happens.
### **Understanding the different transaction status**
On the EVM blockchains, everything starts by submitting a transaction - which can then succeed, fail or be replaced:
### **⛽ Transaction Status - Gas Cost Overview**
Statuts
Gas cost Incurred & satuts
Submitted
Expected cost (not paid yet)
Success
Actual Gas Cost (lower than expected)
Failed
The gas cost is still incurred
Canceled or Replaced
No gas cost incurred
### **Why do transactions fail?**
If the gas price of a given transaction is too low to be picked up within a reasonable amount of time, your transaction will most likely fail because of the price changed.
Transaction can fail for various a range of other reasons, such as invalid input parameters
### **What happens when several transactions are on the same nounce?**
On top of all their other parameters, transactions are submitted with a “nounce”. The nounce represents the order of transaction made by an address -- it increases with each transaction.\
\
Several transactions can be submitted on the same as long as no transaction was cleared on that nounce yet. In such a case, once the first transaction succeeds (most likely one with the highest gas price), all others will be “dropped and replaced”.
{% hint style="success" %}
It means that to replace or cancel a transaction that has not been validated yet, you can submit another one on the same nounce with a higher gas cost than the original.
{% endhint %}
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