None of this answer my simple question:
The fee is paid implicitly as the difference bet input &output?
- or through a UTXO containing it?
-Or both options possible?
First of all: the way you phrased our question was everything but simple.
Secondly: the answer you received from Husires was a perfect explanation.
Take your time to read it through again, and you'll understand
The reply u r talking about answers as if it's just the title question without reading the post
.
Maybe I didn't phrase the title perfectly, but u should read the post before answering
So it would have been just a simple sentence
"No u do not have to include a UTXO for the fee"
Or
"No, either the paper u r mentioning probably had something mixed up, or u didn't understand what they meant"
...
Anyways, we don't grade answers here we are seeking a piece of info
Any non-malicious effort to help reaching knowledge is appreciated