Altcoin chart echoes 2017 and 2021; Bitcoin leads

An analyst on X published a long-term chart comparing three decade-spanning setups in the total altcoin market cap excluding Bitcoin. The chart shows a structure that appeared before the 2017 and 2021 altcoin rallies. The current altcoin market cap stands near $1.06 trillion.

The first setup covered 2015–2016. Altcoins formed an accumulation base, climbed an ascending trendline and then printed a fakeout below that line late in 2016 before the parabolic 2017 rally.

The second setup spanned 2019–2020. The market compressed along a descending trendline and produced a March 2020 crash fakeout that preceded the 2020–2021 altcoin surge.

The current structure, visible since 2023, shows a base that climbed an ascending trendline through 2024 and recently printed a fakeout near its upper boundary.

Bitcoin dominance closed at 60.88% on the daily chart, breaking out of an eight-month range that held dominance between about 58% and 60% from August 2025 to April 2026. The prior cycle high near 66.06% is the next resistance area cited on the chart. Momentum indicators on the Bitcoin dominance chart show the relative strength index was rejected from bullish territory and is rolling over, and the MACD recently printed a bearish cross. Technical support levels are at 59.63% (the long-term 0.236 Fibonacci retracement) and 55.66% (the 0.382 Fibonacci retracement). Analysts note a move below 59.63% would make it easier for altcoins to outperform Bitcoin.

Real-time market readings do not show a rotation into altcoins. The Altcoin Season Index from blockchaincenter.net reads 35. The index measures how many of the top 50 cryptocurrencies have outperformed Bitcoin over the trailing 90 days, excluding stablecoins and asset-backed tokens. A reading of 75 or higher signals an altcoin season on that measure, while 25 or lower indicates Bitcoin season. As of May 2026, Bitcoin held roughly 60.3% of total crypto market capitalization.

Analysts outline a binary framework for whether the chart pattern could lead to a broad altcoin rally: if Bitcoin dominance falls below 59.63% and the Altcoin Season Index rises above 50, the structural setup would gain traction; if Bitcoin dominance extends toward the 66% area and the index stays below 50, the pattern would fail to trigger a broad altcoin run.

When sharing the chart on X, analyst el_crypto_prof wrote, “It would be absolutely crazy if Altcoins were to repeat the story of 2016/2017 and 2020/2021, wouldn’t it? It’s starting to look more and more likely, though. We’ve got every reason to be excited, guys.”