Crypto markets are experiencing a decline, with bitcoin and other cryptocurrencies such as ethereum, dogecoin, and XRP also seeing losses. The extent of the decline is unclear, with some reports indicating bitcoin has fallen below $90,000 and others suggesting it has dropped to a 20-month low, while some alternative cryptocurrencies like HBAR and XLM have seen gains. The cause of the decline is also uncertain, with possible factors including a potential sell-off and unrelated external events.