This market will resolve to Yes if the price of BTC drops to $50,000 or lower at any time (including intraday lows) before 2026-12-31 23:59:59 UTC, as displayed on TradingView using the chart below:
https://www.tradingview.com/chart/?symbol=CRYPTO%3ABTCUSD
Any instance where the displayed price touches or falls below $50,000, even momentarily, will qualify for a Yes resolution.