OMG, anything you ever see or read about "short interest" involving an OTC stock is only from the internal trades of market makers and/or large institutional holders or lenders. There is no retail shorting of OTC stocks!!!!
Technically It is available, I don't know of any brokers that allow Anybody to short OTC stocks And even the ones that do/did require a huge Per share collateral.... Usually something like 2 or 2 and a 1/2 dollars a share. It makes absolutely no sense to tie up that kind of wealth OR risk for a stock trading at .0anything!!
This is something that should be known by anybody trading for more than a few months.