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:


but on the testnet.

  • What does you mean? Bitcoins cannot be double spent.
    – Zergatul
    Feb 10, 2014 at 17:25
  • I assume you mean a situation where two conflicting transactions appeared in close succession? Feb 10, 2014 at 17:30
  • 2
    A double spend wouldn't persist itself in the chain, as the longest chain will cause that double spend to be invalid. Feb 10, 2014 at 18:25
  • @makerofthings7 right. I want to mark the surviving transaction as a 'double spend' attempt, just to alert the user
    – ematiu
    Feb 10, 2014 at 18:34
  • 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. Feb 10, 2014 at 18:43

1 Answer 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).

  • Connecting a program to the SOCKS5 proxy will be also sufficient.
    – Jori
    Mar 13, 2014 at 7:57

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