Quote from: bitcoinuser12345 on June 11, 2016, 02:21:14 AM

Quote from: someguy123 on June 11, 2016, 01:48:55 AM

How about telling us the addresses in question, or even better, the supposed TXID's?

The point of sending a second transaction is because that second transaction would get higher priority, as it has a higher fee.

Let's call them Transaction A and B, you didn't have a fee on A, so you send the exact same transaction again, with a fee, and that became B

Because B has a higher transaction fee, it has a higher chance of getting confirmed. Assuming both transactions are equivalent, it shouldn't matter which one confirms, as only one should confirm assuming the inputs (think of them like coins) are the same. When one confirms, it cancels out the previous one because the previous one would become a double spend, thus become invalid.

When that happens, you may get the original transactions coins back. You may need to start Bitcoin with -rescan (google it) before it will detect that transaction is now invalid.

here is a link to the transactions on the address: https://blockchain.info/address/1MFx5s4ehcSKYGD8fEAHvapewMiXJMFeKF

The first transaction of 0.0003 btc is not being confirmed and there is another for 0.05 btc (paid a small fee of 2.26 ubtc) made around the same time and is not even being shown.

So according to how this double spend works are you saying I cannot make the exact same payment amount twice to the same address if done around the same time? By the way I already did the rescan but didn't do that double spend thing yet.

You can make two transactions spending the same output but one would get confirmed and one would be invalid since the inputs are spent. You can make as many transaction at any amount to the same address at the same time. Provided that the inputs are unspent and the transaction is valid.

Do you own the address(1BiLrgvfH41M4a3J31jACCP7C5tgUuUV5M)? If not, the double spend would be impossible to do. To give us the better understanding, it would be better to tell us which address(es) did you spend the 0.05BTC from.

Quote from: bitcoinuser12345 on June 11, 2016, 02:21:14 AM

Quote from: ranochigo on June 11, 2016, 01:52:53 AM

The transaction will disappear from your wallet and the amount will be added back. However, I would advise you to spend it after waiting for sometime since most nodes would not have forgotten about the transaction and they would not transactions spending same inputs.

sorry but I'm a bit of a noob and didn't get the bold part. What happens if I don't spend it within any specific time frame?

Sorry for the confusion, I mistyped slightly since I was on my mobile.

I was saying that since the transaction has not dropped out of the mempool, nodes would likely not relay it and thus having a low propagation percentage. The higher the percentage, the higher chance a mining pool would see it.