<p>Technically, you are not double spending, since the transaction was never confirmed on the blockchain. Double spending is possible by 51% attack; what you are trying is to replace the transaction with one with desired fees, before it is confirmed on chain.</p>

<p>You can use <a href="https://github.com/petertodd/replace-by-fee-tools" rel="nofollow">https://github.com/petertodd/replace-by-fee-tools</a></p>

CC BY-SA 3.0
2016-05-19T08:11:23.877Z
Not really, there are many forms of double spending, only some of them involve transactions that have already been confirmed.
Meni Rosenfeld
CC BY-SA 3.0
2016-05-18T13:15:50.013Z
2016-05-18T13:15:50.013Z
Kang
<p>I tried to put bitcoins into an p2p exchange with bitcoin-qt. I added a to small transaction fee, so the coins are now stuck as "Unconfirmed". The offer from the exchange is overdue, so all that will happen if the transaction gets confirmed is that I get them back with an administrative fee. </p>

<p>I would like my coins right now and avoid paying the fee. I've read that you can double spend the coins back to yourself and if I add a higher payment fee than the first time this would probably override the original payment. How can I practically do this? I'm not a hardcore developer but feel comfortable using commandlines and know my way around computers.</p>

CC BY-SA 3.0
2016-05-19T01:25:10.107Z
have you tried to add another transaction with more transaction fee than you already paid at your first transaction?
cronus
<transactions><doublespend>
How to pratically doublespend bitcoins?
Kristoffer Nolgren
# How to pratically doublespend bitcoins?

(Asked by: username_0 on 2016-05-18)

I tried to put bitcoins into an p2p exchange with bitcoin-qt. I added a to small transaction fee, so the coins are now stuck as "Unconfirmed". The offer from the exchange is overdue, so all that will happen if the transaction gets confirmed is that I get them back with an administrative fee.

I would like my coins right now and avoid paying the fee. I've read that you can double spend the coins back to yourself and if I add a higher payment fee than the first time this would probably override the original payment. How can I practically do this? I'm not a hardcore developer but feel comfortable using commandlines and know my way around computers.

**Tags:** transactions, doublespend

> **Comments:**
> **username_1**: have you tried to add another transaction with more transaction fee than you already paid at your first transaction?  

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## 1 answers

### Answer by username_2 on 2016-05-18. Score: 1

Technically, you are not double spending, since the transaction was never confirmed on the blockchain. Double spending is possible by 51% attack; what you are trying is to replace the transaction with one with desired fees, before it is confirmed on chain.

You can use <https://github.com/petertodd/replace-by-fee-tools>

> **Comments:**
> **username_3**: Not really, there are many forms of double spending, only some of them involve transactions that have already been confirmed.  

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