You were given three separate methods already, what more do you want?! Unless you are looking for even more users to ignore you forever.

It's literally just one addition (sub) and one multiplication in the EC group to switch between any internal subinterval and a sequential interval. Basic DLP concepts 101.

Seems no one claimed the mempool TX replacement, maybe one of the guys "with a plan". Though it doesn't explain why it took so much time, since the 80-bit key could be broken in seconds with enough DPs available.

Thanks to all who were interested!