Network Analysis of Multivariate Transfer Entropy of Cryptocurrencies in Times of Turbulence

We investigate the effects of the recent financial turbulence of 2020 on the market of
cryptocurrencies taking into account the hourly price and volume of transactions from December
2019 to April 2020. The data were subdivided into time frames and analyzed the directed network
generated by the estimation of the multivariate transfer entropy. The approach followed here is based
on a greedy algorithm and multiple hypothesis testing. Then, we explored the clustering coefficient
and the degree distributions of nodes for each subperiod. It is found the clustering coefficient
increases dramatically in March and coincides with the most severe fall of the recent worldwide stock
markets crash. Further, the log-likelihood in all cases bent over a power-law distribution, with a
higher estimated power during the period of major financial contraction. Our results suggest the
financial turbulence induce a higher flow of information on the cryptocurrency market in the sense of
a higher clustering coefficient and complexity of the network. Hence, the complex properties of the
multivariate transfer entropy network may provide early warning signals of increasing systematic
risk in turbulence times of the cryptocurrency markets.