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I'm using a bitcoin wallet for managing all my transactions. For example, If I have bitcoin 2, 3 and 5. Firstly, I buy a product with price 5. Bitcoin wallet will create a transaction from 2 and 3. When my first payment haven't verified yet, I make second payment by a product with same price is 5. This time will bitcoin wallet choose 2 and 3 or bitcoin 5 for my second payment ? I ask this because first payment haven't confirmed yet.

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If you have enough Bitcoin in your balance it will be all good. Double-spend transactions should only really be made maliciously by reusing the same inputs. If you are using a known wallet you should not have any issues.

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  • thanks. that means my wallet will choose 5 on second payment right.
    – hqt
    Jan 31, 2017 at 16:57
  • Theorically yes but remember there is also a fee to pay and it will be added on top of the payment. It all makes sense after a while, I promise :)
    – Alex
    Feb 1, 2017 at 17:53

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