But to understand the dynamic that led to this year’s depressing year for crypto, we actually should start a few years before 2018. In bitcoin’s early days, Mt. Gox was the go-to service for handling transactions. Then, in 2014, it halted transactions and slowly copped to a crypto-hack to the tune of $473 million, the biggest hack of its kind at the time, and it gave many people pause. But it was still early enough for people to believe that the blockchain system was still getting all the technical kinks out.
Wavelet coherence plots as above highlight areas in the time-frequency space where the two series co-move. The warmer the colour, the higher the coherence (which can be interpreted as correlation) at that location in the time-frequency space; the colours used in this work range from dark blue (0, no coherence) to yellow (1, strong coherence). Statistically significant areas of coherence are surrounded by a thick black line.

According to the essayontime.co.uk platform, ethereum came out many years after hundreds of cryptocurrencies hit the crypto market but has surpassed them by far due to its unique technology.
Of course, crypto is notoriously volatile. The last time Bitcoin reached these levels, it fell back several thousand dollars, and it’s undergone multiple corrections that take it down by half or more. Other coins are even more volatile – the memecoins bounce back and forth wildly at times – and scams and hacks occur with some frequency.