BitUndo private transactions:

If you choose to make your undo transaction private, nobody will be able to see that you tried to undo a transaction, unless it succeed. You have to know that a private undo transaction has less chances to succeed, as is not distributed in the whole bitcoin network.

From what I know, for a undo transaction to even stand a chance of competing with the main transaction, it has to be broadcasted to the public network.

If so, then how does Bitundo "private transactions" work?

1 Answer 1


The failed transaction won't get stored in a block on the blockchain, so it will be hard for an average person to find them. I think most of the Bitcoin nodes will delete them from memory eventually.

Also, these sneaky undo transactions are probably not broadcast so publicly in the same way that normal transactions are; they are probably sent to a smaller network of miners who want to participate in this undo system.

  • But isn't it rather counter-intuitive? I mean for it to be undoed successfully it needs to be broadcasted to the public network right? Or is it such that this small pools of private networks actually have a non-insignificant chance of getting their transactions to win?
    – Pacerier
    Commented May 25, 2014 at 0:17
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    Even if that's the case, it would be inaccurate to say that "nobody will be able to see it". The miners in question would see it. Commented May 25, 2014 at 2:56
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    Nate, actually, the BitUndo system doesn't have to distribute the actual undo transactions to the miners immediately, it can just distribute hashes of transactions. Then when the miner succeeds in finding the block, they would have to query Bitundo and prove they have a block and ask Bitundo to fill in all the undo transactions in that block. From my reading of bitundo.com/developer.html , it appears they are not doing it this way, but I think they could. Commented May 25, 2014 at 6:57
  • Actually, only the public ones are available on the websocket server; I don't know how the private ones actually work but maybe it's something like I suggested in the last comment. Commented May 25, 2014 at 7:04
  • @DavidGrayson, But that seems theoretical... I mean practically speaking most miners don't do that right?
    – Pacerier
    Commented May 25, 2014 at 7:16

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