Technical analyst John Bollinger has identified a potential 'W' bottom pattern in the charts of Ethereum (ETH) and Solana (SOL), indicating a possible bullish reversal. ETH has tested the $3,700 level twice this month, while SOL has rebounded after reaching $175 in October. This pattern, a bullish signal in Bollinger Bands, suggests a significant price movement may be on the horizon. While Bitcoin (BTC) has not yet formed this pattern, Bollinger noted that it is still building its base. BTC's Bollinger Bands have widened due to increased volatility, and the market remains above the 50-week SMA despite recent fluctuations. Analyst 'Satoshi Flipper' highlighted that Bollinger's previous warning in July 2024 preceded a substantial BTC rally.