This is a 30-minute chart of GBTC showing Fibonacci support at 36.79 (38.2%), 33.13% (50%), and 29.46 (61.8%). This morning GBTC fell to its first Fibonacci support level and held. We should know by the end of trading today if price is now headed to new highs above $48.65, or more retracement is unfolding.
