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Dec 9, 2016 at 18:31 comment added Fakeer Thanks 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)
Dec 9, 2016 at 6:01 comment added rny 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.
Dec 8, 2016 at 21:49 comment added Fakeer 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.
Dec 8, 2016 at 2:47 history answered rny CC BY-SA 3.0