<p>I want to make sure that the transactions I create with the original client are always using confirmed inputs and self created outputs.</p>

<p>Bitcoin used one of the transactions that I describe here in this question: <a href="https://bitcoin.stackexchange.com/questions/22663/stuck-duplicate-transaction-in-bitcoinqt">Stuck duplicate transaction in BitcoinQT</a></p>

<p>as an input. So the new transaction is not being confirmed either. </p>

<p>I want to make sure that my transactions are always using confirmed transactions. Is this possible?</p>

CC BY-SA 3.0
2014-03-04T10:34:42.660Z
You can't use self-created outputs until they have sufficient confirmations. Otherwise, your transactions can fail to confirm due to signature malleability.
David Schwartz
CC BY-SA 3.0
2014-03-04T19:59:58.013Z
Hey David, thank you. Do you mean I shouldn't or I can't? Because like I said in the question, Bitcoin did use a self created transaction that has 0 confirmations as an input. Mind you that the both transactions are still unconfirmed. And I think they never will be. Because the input transaction is a duplicate of another transaction that did get confirmed. What I mean by duplicate is exactly the same inputs and outputs but different TXid.
Emre K.
CC BY-SA 3.0
2014-03-04T20:05:09.733Z
Right, that's why you don't want to use even your own outputs until they have sufficient confirmations. You don't know what the transaction ID will be.
David Schwartz
<transactions><client>
How can I tell Bitcoin to only spend confirmed inputs and self created outputs
Emre K.
# How can I tell Bitcoin to only spend confirmed inputs and self created outputs

(Asked by: username_0 on 2014-03-04)

I want to make sure that the transactions I create with the original client are always using confirmed inputs and self created outputs.

Bitcoin used one of the transactions that I describe here in this question: [Stuck duplicate transaction in BitcoinQT](https://bitcoin.stackexchange.com/questions/22663/stuck-duplicate-transaction-in-bitcoinqt)

as an input. So the new transaction is not being confirmed either.

I want to make sure that my transactions are always using confirmed transactions. Is this possible?

**Tags:** transactions, client

> **Comments:**
> **username_1**: You can't use self-created outputs until they have sufficient confirmations. Otherwise, your transactions can fail to confirm due to signature malleability.  
> **username_0**: Hey David, thank you. Do you mean I shouldn't or I can't? Because like I said in the question, Bitcoin did use a self created transaction that has 0 confirmations as an input. Mind you that the both transactions are still unconfirmed. And I think they never will be. Because the input transaction is a duplicate of another transaction that did get confirmed. What I mean by duplicate is exactly the same inputs and outputs but different TXid.  
> **username_1**: Right, that's why you don't want to use even your own outputs until they have sufficient confirmations. You don't know what the transaction ID will be.  

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