I sent money from 4 inputs to 2 outputs, one of which I don't control. The transaction's fee is too small (didn't change my settings and the transaction fees got a lot higher, recently) and will not confirm anytime soon.
I then created a new transaction spending 2 of the 4 inputs of the original transaction to 1 output. This transaction is obviously doubple-spending.
After trying to breadcast the second transaction via Electrum and with several online services, still not a single one broadcasted it. They all know it's a double-spend and won't broadcast double-spends.
Subsequently, I installed
bitcoin-qt, hoping to be able to send the transaction directly to my peers.
I never used the
bitcoin-qt console before, so I hope this is correct:
I cut the string off after 12 characters. The entire signed transaction is 382 hexadecimal digits long. Do I need to use quotes, some kind of brackets, a semicolon, something else?
The error message it returned is this:
Missing inputs (code -25)
I don't know what this error message means exactly but in case it means that the inputs were not found in the UTXO set generated from the part of the blockchain that was already downloaded:
bitcoin-qt doesn't know my inputs as they are only between a few months and a few weeks old but it shouldn't have to to send a signed transaction.
It doesn't know my private keys either, but again, it shouldn't have to.
Can I force it to do so even if it can't check whether the inputs exist? The reason is that I'm on a super slow internet connection and downloading the blockchain would take several days, even if nothing else went over the connection during that time.