Altcoin season index now at 67 has the leading altcoins lined up for breakout after Bitcoin dominance retreated to 57.6%. That’s down from the cycle high of 65.1% on June 27, 2025, and only slightly above the yearly low of 53.9% hit in December 2024. The shift signals fresh capital rotation, with traders watching whether majors like ETH, XRP, BNB, and SOL can extend momentum as Bitcoin loses share. Source: Altcoin Season Index Chart Bitcoin Dominance Chart Signals Pressure The latest CoinMarketCap data shows Bitcoin’s share of the market at 57.6%, Ethereum at 13.1%, and other assets at 29.3%. ETH’s share is off from 14.4% a month ago, while “Others” has climbed, confirming that mid-cap altcoins are gaining ground. Source:CoinMarketCap BTC Dominance Chart The weekly chart highlights repeated failures in the 65–67% resistance zone, with support layered around 55%. If dominance slides below that floor, traders expect the next stop near 50%. Analyst Michaël van de Poppe said the current setup mirrors past cycles where BTC lost ground and altcoins rallied, though he cautioned short-term retests toward 60% remain possible. It's very clear: #Altcoins are going to go up in the coming period.However, during those periods, you can have corrections. I wouldn't be surprised to see the #Bitcoin dominance have a slight bounce upwards before we're going to have the next leg down. pic.twitter.com/e7x0QSobyG — Michaël van de Poppe (@CryptoMichNL) September 20, 2025 TOTAL2 Breakout Validates Altcoin Cycle The TOTAL2 index, tracking all altcoins excluding BTC, has cleared a four-year ceiling at $1.5 trillion; that level now flips to support. Source: TradingView chart on TOTAL2 Analyst 𝕄𝕠𝕦𝕤𝕥𝕒𝕔ⓗ𝕖 compared the breakout to the 2018–2021 accumulation phase that fueled a sharp surge. Momentum signals back the view, with MACD turning bullish and targets forming in the $2.5–$3 trillion range. #AltcoinsTOTAL2 has broken the strongest resistance after 4 years and is turning it into support.What more could you wish for?This is so INCREDIBLY bullish for your bags.🫡BE MORE BULLISH. pic.twitter.com/F080pidLxf — 𝕄𝕠𝕦𝕤𝕥𝕒𝕔ⓗ𝕖 🧲 (@el_crypto_prof) September 20, 2025 Market Context and Key Movers Global crypto market cap sits at $4.04 trillion, with daily trading volume close to $100 billion. The Fear and Greed Index holds neutral at 48, while the Altcoin Season Index at 79 shows capital rotation is already underway. Source: CoinMarketCap However, the Altcoin Season Index at 79 indicates that momentum has decisively shifted toward altcoins. Among leading assets, Ethereum trades at $4,487 with steady gains, while BNB leads performance with a 4.41% surge to $1,026. Solana maintains its uptrend at $239, and XRP remains under pressure at $2.99. Disclaimer: The information presented in this article is for informational and educational purposes only. The article does not constitute financial advice or advice of any kind. Coin Edition is not responsible for any losses incurred as a result of the utilization of content, products, or services mentioned. Readers are advised to exercise caution before taking any action related to the company.