Nice graphical representation. Can I know what application you use to do that? I just wondering, will it be more informative if those lines have legends?
There are too many edges and nodes to be able to display more information, as you can see from the images. So the colors and bigger names are one way to show major connections and visualize patterns.
Right, legends would be overlapped and prevent to see the structure of the networks. Instead one can use weighted arrows like figures in
https://bitcointalk.org/index.php?topic=3650124.0 As for the tools, I wrote about it in other thread,
https://bitcointalk.org/index.php?topic=3803541.0 let me quote it here:
Finally, several people asked me what kind of tools I am using for these network analyses, and I presume there are more potential interests, so let me answer here. I am using igraph on python and Gephi, which are tools designed for social network analysis (SNA). There are many softwares and programming tools for SNA, see e.g. the list in Wikipedia
[4], among which you may find your favorite ones.
-snip-
[4] Wikipedia, https://en.wikipedia.org/wiki/Social_network_analysis_software#Types_of_Software