I just found a new style of bitcoin transaction that I wanted to do but could not find any tools that could express it, even bitcoin-qt. You could of course do this with the commandline but I wanted something that was a bit safer.

The idea is you create a single input and single output transaction for privacy and efficiency reasons. Now let’s say it might take awhile to confirm and you just remembered you want to add another output to the same transaction.

I want a way to take that unconfirmed transaction, double spend the input, adding another output, reducing the amount from the original output, redirecting some of that to the new output, and also reducing the overall amount by some value to bump the fee for the miner.

Maybe this is too advanced, but it would have saved me having to do another bitcoin transaction.

In general I think what I want is a way to edit a transaction in flight, but bitcoin-core only allows fee bumping. Maybe they don’t want to make double spending easier 😂