The key supporting evidence comes from a reputable news article that cites OKX exchange data directly, reporting both the price drop below 68,000 USDT and the corresponding 0.7% decline in Bitcoin's value. This source has high relevance to the statement and moderate authority, as it references actual market data from OKX rather than speculation or commentary. Additional TradingView market idea content provides circumstantial confirmation of a Bitcoin dip in similar time frames, which aligns with the reported movement but is less authoritative. Other sources either do not pertain to BTC/USDT pricing or lack specificity regarding the exact threshold and percentage move. No credible evidence contradicts the statement, and the reported data points are consistent with general market behavior observed during the period. Given the direct citation of OKX data and the absence of competing narratives, there is strong support for the claim's truthfulness.