I understand that you are a bit angry like many people (and myself) about this stuff, but please consider that this is determinist, they can't easily reinvent everything
I am not talking about xpub, but the public key associated to anyone's address, even if it's supposed to be public, which is not the case in fact since all of what you get is the hash of the public key (ie your address), you can only get it when a transaction happens where the public key is disclosed finally
Then let's try understanding what they are doing, there is no magic there, and the more info I get the better it is (ideally a post/email "real time" with a transaction spending some unused coins so I can get it and see all the details, which is not possible with their explorer)
PS:
As for your tool. I will look at it later; however, I noted immediately that the inputs are address which never contained bitcoin (as you pointed out may be a miner, but could also be part of an exchange). So, they are addresses that were funded after the fork and likely from an exchange that was able to get coins from the phase 1 fork when they were included in hope of UB getting the name out or miner. Although I have access to many addresses and their pkeys, I don't believe I have access to a single address that has UB since they were all defunded as unutilized.
I don't understand what you mean, it's not a tool for UB but all coins, I will not repeat it all along the posts but if someone can, then just try it here to see what happens
