Figure 3
Hot and cold spots of Bitcoin mining activity with the corresponding significance map. (a) The hot spots (High-High clusters) and cold spots (Low-Low clusters) under the default setting of 999 permutations and a p-value ≤ 0.05 are marked in red and blue, respectively. (b) The corresponding significance map shows the clusters with the degree of significance reflected in increasingly darker shades of green, starting with 0.01 < p ≤ 0.05 (n = 215), then 0.001 < p ≤ 0.01 (n = 48) and p ≤ 0.001 (n = 5342). The ‘Not Significant’ category with p > 0.05 remains the same in Maps (a) and (b). Details of the statistics are supplied in “Methods” and the repository as noted. The results are based on the monthly data from June 2018 to May 2019. The maps are created by Geoda 1.18 (http://geodacenter.github.io/download.html).
