I previously mentioned this to solaris also.
As it's been mentioned here in public now I may as well explain the proof.
There is of course the loose proof that the previews are identical, tracklistings and incorrect track listing orders match, same inaccuracies etc. But that doesn't count for much.
However when Skyline introduced this SkyShare manager software, if you are a curious person, all you had to do was pop open Wireshark or some other network capturing program and find out where its grabbing its data from.
It populates its pages from an API on mp3xclusive.com, and for some time, the data sent back when browsing an album page included details of the tracks, track length, all the stuff you'd expect - but also included what appeared to be a hard drive location and another variable which contained urls for downloads on recordings.ru. Also on a few albums I noticed that whilst the urls were always for get01.recordings.ru, some hard drive locations mentioned
lavamus.
Now about the time when they updated to the new version of the software, they removed this information, however all albums still send back a variable called 'recs_id' which matches the ID number of the album on recordings.ru.
I doubt that Skyline/Xclusive and
Lavamus are more public fronts for recordings.ru, but rather that they are in cahoots with them as they are not a direct copy of each other, and if memory serves me I am sure I have seen some items on
Lavamus that do not appear on recordings.ru.
Furthermore, given this recent fiasco with data loss, and issues with websites - that also hit
Lavamus I believe - recordings.ru has worked fine throughout - without loss. I've noticed on
Lavamus that some tracks do not "encode" aka add
Lavamus.com to ID3 tags on the files, or are vacant from tracklistings, yet the same track will download from recs.ru.
So I doubt they are one and the same but they defiantly originally source stuff from recs.ru - but this is somewhat confusing as to why tracks do not work on Skyline at the moment, so my guess is that Skyline leeches off of recordings.ru somehow, but not by 'plugging into' their hard drives, but by nicking stuff and putting it on their own drives perhaps? Failing that, maybe they do and its some kind of database corruption?
Who knows! It's a shame because recs.ru is a fantastic archive but a pain to fund so
Lavamus and Skyline provide an easier way.