Retail traders are increasing their bearish bets on Bitcoin as it climbs above the $105K zone.Data from Alphractal's Leveraged Traders’ Sentiment indicator shows a rise in short interest, particularly among smaller market participants.Historically, when retail traders are heavily bearish, the market tends to move in the opposite direction.The contrarian setup, with rising bearish bets and steady Bitcoin ascent, could lead to a short squeeze or continuation of the uptrend.