Citigroup has issued a warning that Bitcoin's recent weak trading pattern could signal a potential downturn for the Nasdaq 100 index. The bank's report highlights a liquidity crunch caused by the US Treasury's cash restructuring and a $500 billion reduction in bank reserves, which has negatively impacted Bitcoin and other risk assets. However, as the Treasury's cash balance restructuring concludes, improved liquidity could lead to a year-end rebound for both Bitcoin and the stock market. The report also notes that while the AI boom has bolstered the stock market, investor skepticism about returns and rising hardware costs pose challenges. Tech giants Meta and Alphabet have raised significant funds through debt financing for data center expansion, a move reminiscent of the dot-com era but supported by stronger corporate balance sheets today. Citigroup suggests this debt expansion indicates opportunity rather than pressure, though it may not favor bondholders.