比特币暴跌4000美元，杠杆多单清算额达5亿美元

The assessment is primarily based on one highly authoritative and relevant source which confirms the core premise of the statement. The report from The Block, a specialized crypto publication, details a massive liquidation event of leveraged long positions in the crypto market, totaling over $1.7 billion. While the figure in the statement ($500 million) is different, it is not contradictory; it could represent a subset of the total liquidations (e.g., only Bitcoin positions or those from a specific timeframe that triggered the main price drop) and is a plausible figure within the context of the larger event. Such large-scale liquidations of long positions are a well-known catalyst for sharp, sudden price drops in Bitcoin. The claimed price drop of $4,000 is a realistic consequence of such a market event. Most of the other provided sources are irrelevant as they discuss different cryptocurrencies, legislation, or hypothetical scenarios. While there is no source that explicitly confirms both the '$500 million' liquidation figure and the '$4,000' price drop in a single sentence, the strongest piece of evidence strongly corroborates that the type of event described did occur on a massive scale. Therefore, the statement is very likely to be a factual description of a real market event.