Neither, actually, and Glassnode's own framing on this is more careful than the headline running around right now.

Altcoin spot volume has climbed to nearly 4x Bitcoin's, the highest ratio since September 2025. The Altcoin Season Index jumped to 62-64%, up from just 33% a month ago, and 72.5% of tracked altcoins outperformed BTC over the past week, versus only 39% during August's rally. Real, sharp acceleration by any measure.

Here's the part most coverage of this stat skips though. The 4x ratio measures trading turnover, not net capital inflow. Higher volume captures both buying and selling simultaneously, so this number alone can't tell you whether new money is entering altcoins or whether existing holders are just trading more aggressively among themselves. That distinction matters enormously for which of your two framings is actually correct.

What stands out to me is Glassnode's own historical caveat, sitting right inside the data they're reporting. Similar spikes in altcoin-to-BTC volume have historically coincided with local Bitcoin price tops, not confirmed altseason starts. That's not a prediction, it's a pattern match, and pattern matches break.

The Altcoin Season Index detail actually argues against calling this altseason yet. CoinMarketCap's version sits around 64, its highest reading this year, but the confirmed threshold is 75, and most desks also want Bitcoin dominance below 55% alongside it. Dominance is currently sitting around 58-59%, close, not there.

The open question isn't whether rotation is happening, breadth has genuinely expanded and that's real. It's whether this is early positioning ahead of a broader move, or exactly the kind of risk-appetite spike Glassnode's own data says has preceded BTC cooling off before.
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