Bitcoin's 90-minute chart has triggered a 'green sell TD 9' signal, indicating a potential short-term correction. This signal, identified by AiCoin at 22:00 on December 19, suggests that Bitcoin may face downward pressure. Following the signal, Bitcoin's price has entered a consolidation phase with low trading volume, persisting for over 12 hours. Traders are advised to monitor the situation closely as the market could experience a correction.