CoinWorld News reports that on April 21, crypto market analyst Axel stated that Bitcoin's 30-day net flow shifted from positive to negative starting in early March. On March 25, it briefly reached a strong outflow peak of -300k BTC, and as of April 21, it remained at a net outflow of -98k BTC. During the same period, BTC reserves on trading platforms decreased from 300k to 98k, a continuous decline for seven weeks, totaling a reduction of over 105k BTC. No panic inflows were observed during the April price correction, indicating that tokens are continuing to accumulate with long-term holders. The current pattern is interpreted as a synchronized accumulation signal, but there is a need to be cautious of the potential risk if net flows return to positive territory.