On March 17, 2026, Bitcoin's price surged powerfully through the 75,000 USD psychological barrier, reaching a peak of 75,800 USD, marking a new high in the recent rebound. This price movement not only successfully broke through the resistance zone (73,750–74,400 USD) that had suppressed upward movement multiple times since 2024, but also sparked widespread market discussion about whether "the bull market is returning." Unlike previous rallies driven by spot market sentiment, structural changes in the derivatives market have become the core engine of this round of price action. This article will analyze 4 key signals released by the current market from four dimensions—on-chain data, derivatives structure, macroeconomic comparison, and market sentiment—and, under strict distinction between facts, viewpoints, and speculation, extrapolate the sustainability and potential impact of this breakthrough.