The only accurate & reliable short data is the FINRA (www.finra.org/) bi-monthly short report which is posted both here at FINRA and here at OTC Markets (http://www.otcmarkets.com/home)
The FINRA daily short data does not show short interest. It merely represents shares initiated by a MM as short throughout the trading day. The numbers are NOT cumulative and are meaningless to retail investors.
The short data for all OTC stocks including those quoted on OTC Markets (fka Pink Sheets) is sent to FINRA twice a month by broker/dealers. FINRA compiles it and publishes a semi monthy report. These semi-monthly reports show the aggregate short position by all market makers as of that settlement date.
Anyone who wants to understand the truth regarding OTC equity short interest data should call FINRA's Legal Section, Market Regulation at (240) 386-5126, or its Office of General Counsel at (202) 728-8071.