The correlation between Bitcoin (BTC) and Ethereum (ETH) is structurally high and stable, typically ranging between +0.80 and +0.90 across various time horizons, with 30-day figures around +0.88 and one-year values between +0.82 and +0.91. This relationship is markedly different from the BTC-Gold correlation, which averages only about +0.10 to +0.13 and can sometimes be…