<p>Invalid transactions are not kept as part of the blockchain; they are, after all, invalid. Your best bet might be to listen to the chatter on the network (you'd require a custom-written client for this, I would imagine).</p>

CC BY-SA 3.0
2014-03-13T07:57:02.677Z
Connecting a program to the SOCKS5 proxy will be also sufficient.
Jori
CC BY-SA 3.0
2014-02-10T20:56:08.580Z
2014-02-10T21:04:20.763Z
2014-02-10T21:04:20.763Z
AMADANON Inc.
<p>Where can I find some double spend attempts examples on testnet? Can anyone refer me some TXIDs with double spends on testnet?</p>

<p>EDIT: I need some example in which an outpoint was intended to be used in two different transactions, like this one:</p>

<p><a href="https://blockchain.info/tx/6900440e3bf9d7177ef69b8ca8bb620cb439d9261ce54b3df564f6778547003c" rel="nofollow">https://blockchain.info/tx/6900440e3bf9d7177ef69b8ca8bb620cb439d9261ce54b3df564f6778547003c</a></p>

<p>but on the testnet.</p>

CC BY-SA 3.0
2014-02-10T17:25:26.610Z
What does you mean? Bitcoins cannot be double spent.
Zergatul
CC BY-SA 3.0
2014-02-10T17:30:50.713Z
I assume you mean a situation where two conflicting transactions appeared in close succession?
Nate Eldredge
CC BY-SA 3.0
2014-02-10T18:25:53.583Z
A double spend wouldn't persist itself in the chain, as the longest chain will cause that double spend to be invalid.
makerofthings7
CC BY-SA 3.0
2014-02-10T18:34:37.530Z
@makerofthings7 right. I want to mark the surviving transaction as a 'double spend' attempt, just to alert the user
ematiu
CC BY-SA 3.0
2014-02-10T18:43:22.693Z
There are multiple temporary chains.  In that case you will need to monitor each chain and derive your use case in your app...  I don't think that the temporary chains are kept permanently and are purged over time.
makerofthings7
<testnet><doublespend>
Double spend attempts examples on testnet?
ematiu
# Double spend attempts examples on testnet?

(Asked by: username_0 on 2014-02-10)

Where can I find some double spend attempts examples on testnet? Can anyone refer me some TXIDs with double spends on testnet?

EDIT: I need some example in which an outpoint was intended to be used in two different transactions, like this one:

<https://blockchain.info/tx/6900440e3bf9d7177ef69b8ca8bb620cb439d9261ce54b3df564f6778547003c>

but on the testnet.

**Tags:** testnet, doublespend

> **Comments:**
> **username_1**: What does you mean? Bitcoins cannot be double spent.  
> **username_2**: I assume you mean a situation where two conflicting transactions appeared in close succession?  
> **username_3**: A double spend wouldn't persist itself in the chain, as the longest chain will cause that double spend to be invalid.  
> **username_0**: @username_3 right. I want to mark the surviving transaction as a 'double spend' attempt, just to alert the user  
> **username_3**: There are multiple temporary chains.  In that case you will need to monitor each chain and derive your use case in your app...  I don't think that the temporary chains are kept permanently and are purged over time.  

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## 1 answers

### Answer by username_4 on 2014-02-10. Score: 1

Invalid transactions are not kept as part of the blockchain; they are, after all, invalid. Your best bet might be to listen to the chatter on the network (you'd require a custom-written client for this, I would imagine).

> **Comments:**
> **username_5**: Connecting a program to the SOCKS5 proxy will be also sufficient.  

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