What are conflicting transactions? Does it mean BTC lost permanently?

Conflicting transactions are simply two or more transactions that spent the same UTXO in its inputs (i.e. doublespending).

The only remedy is to not treat a transaction as successful until it has a number of confirmation that satisfies you.

It is impossible to recover from a successful doublespend attack should the conflicting transaction be included in the blockchain.

renlord

Posted 2016-12-08T00:16:57.583

Reputation: 2 167

Looking a the inputs and outputs, does it look like the transaction was initiated with zero fees? If so it seems strange as most wallets commonly do not initiate transactions with low/no fees. – Fakeer – 2016-12-08T21:49:07.247

I don't see how does that help. The point is you can create transactions that pay zero or more fees. Whether or not they confirm is another matter. – renlord – 2016-12-09T06:01:16.293

1Thanks for the responses. Due to mostly smaller sized transactions the merchant cannot wait for confirmations. Given this primary constraint I'm trying to find out how to take precautions to minimize double spend attacks. That's why I was trying to identify some parameters that can be used for defence - e.g. not accepting zero fee Txs. A reasonable fee having a high chance of being propagated quickly (I understand that the same inputs can be sent in two txs one with higher fees) – Fakeer – 2016-12-09T18:31:18.040

What are conflicting transactions? Does it mean BTC lost permanently?

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