There is no such thing as an "official" buy or sell. Even though IHub and some other quote services like to label trades as one thing or another, there is nothing "official" about it. Trades are not marked on the tape as "buys" or "sells" by OTCMarkets, the OTCBB, or any exchange. However, ADVFN's Trades page says:
"Trade definitions are based on the mid-price and are indicative only"
This means, roughly:
1. If the print is closer numerically to the bid at the time, they'll label it a "sell," and if it's closer to the ask at the time, they'll label it a "buy."
2. "Indicative only" = "we know this stuff doesn't really mean anything, but we will provide it because some people like to see it"
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