mocacinno and ETFbitcoin, Thank you, I just wanted to test but look like I will waste my time. I have been confused because the quote in my first post is old from 2017. So I was puzzled, especially since it was about solutions to cancel a transaction and I read the same in another place.

Last questions

- HeRetiK says it worked before, I'm not old in BTC enough but when it stopped to work, approximatively of course.
- while reading the forum, I found this topic https://bitcointalk.org/index.php?topic=2269914.0