Data shows that BTC's market share has dropped from 60% over the past month to below 57% (currently at 56.7%). Analysts predict that BTC's market share seems about to break through its multi-year support trend line. In addition, ETH's market share also fell to 12.9%, while other cryptocurrencies' market shares rose to 31.5%, higher than last month's 28.1%. Analysis points out that the significant drop in BTC's market share has significantly affected the market sentiment, indicating that the altcoin season has arrived.