[HELP!]I created a zero fee transaction now I want to cancel.

[tsoPANos]

Hey guys!
I am in desperate need of your help.
I created a transaction, and soon after that I decided I wanted to cancel it.
The transaction has zero fees, so it will take a while to confirm.
I used https://brainwallet.github.io/#tx to create the transaction and I broacasted with electrum!
Please take some time to help me!

Thanks in advance!

[Dare]

If you broadcast a conflicting transaction (by consuming one of the outputs used in your zero-fee transaction) that has an appropriate fee, it should override the zero-fee transaction. This is dependent on which transaction is included in a block first, however, as whichever transaction is confirmed will invalidate the other. Can you post the transaction ID for your zero-fee transaction?

[tsoPANos]

thank you very much, I appreciate a lot your willingness to help!
But sadly the transaction got confirmed within 40-45 minutes of being broadcast! 
And It had zero fees!  That's pretty confusing....

Anyways, thank you again...

[escrow.dude]

If you broadcast a conflicting transaction (by consuming one of the outputs used in your zero-fee transaction) that has an appropriate fee, it should override the zero-fee transaction. This is dependent on which transaction is included in a block first, however, as whichever transaction is confirmed will invalidate the other. Can you post the transaction ID for your zero-fee transaction?

I would think that the conflicting TX would get rejected by the nodes if there is already a TX in the node's memory pool containing the same outputs.

[bitpop]

Yeah you can't transmit a conflicting transaction

You got lucky and got it confirmed

One day we may get child pays for parent where you can send a fee later