anyone have any tricks? It get very cold were I am, -50 sometimes...every oil/paste base I have tried seems to quit at -20 or so...tried vaseline, peanut oil, glycerin...sardines in soybean oil and noting seems to keep smelling when its cold

Some ideas...
A few guys have been playing with BLACK colored lures to utilizes the sun rays to heat up the lure and get the skunk odors active.
Lot of old timers claim that peanut oil will allow a lure to stay active in cold weather...I see you know about that...stick with it and experiment a bit
Chunks of bait that the birds can get to might create enough of a mess on the bottom of the tree to "call" marten to your trap site.

-20 to -50 temps are brutal not sure any lure can operate up to full potential in those extremes??
Be careful

Super Lube Grease don’t freeze until -45. I use it as a base in my call lure, never had it crust over.

I have to override my spellcheck to spell it correctly. It will time and time again correct my spelling even when it's right.

you can try cat fish cream mixed with beavertail oil what ever you smear it on the only way it can be removed is to be chewed off i still add glycerin
but when the set is finished i use a small pocket torch to scorch the paste

Tatiana,
Based on where you are, how close are the Marten you catch to what people refer to as a 'Russian Sable' ?
I've seen Marten caught along the NW coast of Alaska, that were extremely dark, with nearly no throat patch and very silky.
Unlike most of the ones here caught throughout the main land of the 'Lower 48'.

The ones in your photo seem similar, but there is that one, which appears a lot darker.

One of the organic chemist that I worked for developed/patent a polymer that was put onto the bottom of boats that reduced drag/water resistance......wonder what that would do mixing in some marten lure attractant
Thank-you for your contribution Tatiana

Tatiana do you have many Raccoons in Siberia i just wondered how they reacted to the Methyl Anthranilate

you are awsum