It can be seen from Fig 6 that coherence in the short run is erratic throughout the time interval analysed, and that there is little appreciable difference between the bubble and non-bubble regimes. However in the medium term (8–16 and 16–32 days), coherence generally peaks around areas where bubbles have been identified in the price series. The longer term relationship, though, is less dependent on whether the price is in a bubble phase.
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But no true cryptocurrency emerged until the late 2000s when Bitcoin came onto the scene.
Dow, the man who first shorted bitcoin, for instance, even mentioned in his initial post that a person can be “simultaneously bullish on blockchain and bearish on bitcoin.” And he just announced that he’s ending his short.