Bitcoin experienced a slight decline of 0.5% to $89,600 as traders engaged in year-end profit-taking, impacting the broader cryptocurrency market. Ethereum (ETH) and Solana (SOL) also saw declines, while major tokens like XRP and Cardano (ADA) fell by up to 2%. The market downturn is attributed to thin liquidity and uncertainty surrounding Federal Reserve policies, according to BTSE's Jeff Mei and SignalPlus' Augustine Fan.