On March 17, 2026, Bitcoin's price broke through the critical psychological level of $75,000 with strong momentum, reaching a high of $75,800 and setting a new peak for the recent rebound. This price movement not only successfully cleared the resistance zone (73,750–74,400 USD) that had suppressed upside movement multiple times since 2024, but also triggered 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, macro comparison, and market sentiment—and under strict differentiation between facts, opinions, and speculation, extrapolate the sustainability and potential impact of this breakthrough.