Although short term relationships are erratic and sparse, this is the period band that contains most of the negative—although usually fleeting—relationships (shown by leftward facing arrows). The relationships link online activity increases to price falls (the converse is not observed). It is not surprising that occasionally discussion is associated with price falls, as negative events (e.g. blockchain bugs, and exchange hacks) are newsworthy in the community.
The SADF test finds the largest ADF statistic from all the windows considered. If this value exceeds a critical value, the null hypothesis can be rejected, and it is deemed the series displays explosive behaviour in at least one of the windows (taken as indication of a bubble occurring).

Under the new law, El Salvador will “promote necessary training and mechanisms so that the population can access [Bitcoin] transactions.”
But it wasn’t just outside pessimism that led to the slump, but infighting as well. Blockchains are decentralized, and democratic systems require buy-in from participants in order to keep the engines running. When there’s a schism that can’t be decided by the majority, all hell breaks loose.