First documented in January 2015 on Twitter. Currently active and in regular use across social platforms since 2015.
Period when altcoins (cryptocurrencies other than Bitcoin) outperform BTC dramatically. Pattern: BTC leads, money rotates to ETH, then to smaller caps. Alt Season Index tracks BTC dominance. Typical cycle: BTC pump → ETH 2x BTC → altcoins 5-20x. 2017 alt season (ICO boom), 2021 alt season (DeFi/NFT). Extremely risky: 95% of altcoins die long-term.
Sources: Market data, cryptocurrency tracking sites, financial news
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