BTC Up or Down - 15 Minutes

Predict whether BTC price will go up or down based on the OKX 15-minute candlestick. Start price is the candle open at market start; end price is the candle close at market end. If end price >= start price, result is Up (Yes wins); if end price < start price, result is Down (No wins). An unchanged price counts as Up. Verification: https://www.okx.com/trade-spot/btc-usdt