On March 18, 2026, from 18:45 to 19:00 (UTC), Bitcoin experienced a -0.72% return over 15 minutes, with price fluctuations between 70,946.6 and 71,615.2 USDT, a volatility of 0.93%. Market attention increased during this period, trading activity was active, and selling pressure dominated the market in a short time, leading to significant short-term volatility.
The main driver of this movement was the concentrated inflow of large on-chain BTC transfers to mainstream exchanges. Between 18:45 and 19:00, two large transfers totaling 2,150 BTC were monitored flowing into exchanges, along with a net inflow of 2,050 BTC into exchange-held BTC, clearly indicating potential large-scale selling pressure. Additionally, the depth of sell orders in both spot and futures markets increased simultaneously, while buy-side support was insufficient, accelerating the price decline.
Meanwhile, the open interest in derivatives markets decreased by about 4%, with the long-to-short ratio dropping from 1.08 to 0.97, indicating that long positions were actively or passively closed, and short sellers’ strength increased. The funding rate for contracts briefly dropped to 0.008%, further encouraging short-term bearish momentum. On-chain trading activity increased, with active addresses and transaction counts rising by 8% and 10% respectively, but the average transaction size remained unchanged, reflecting that large on-chain transfers were the main cause of this volatility. All major trading platforms in the market showed net inflows, indicating that the movement had strong market resonance rather than being an isolated event.
Short-term risks include monitoring subsequent large BTC transfers to exchanges, net inflow data, contract open interest, and the continuation of the decline in the long-to-short ratio, as well as the recovery of buy order depth. If on-chain selling pressure persists or market sentiment weakens, price volatility risks remain. Investors should continuously track real-time market prices, on-chain fund flows, and key resistance/support levels, remain alert to sharp fluctuations during abnormal movements, and seek more firsthand market information.
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