Figure 7

Visualization of the international Bitcoin flow for 2013. The size of each ribbon is proportional to the amount of Bitcoin expressed in dollars exchanged between 2 countries (the colour of a ribbon identifies the sender country). On the external circle we show the repartition of the flow in term of sending (external bar) and receiving (external bar) for each country (or group of countries). The division of countries in groups has been done for visualization’s purpose. The members of the groups are given in Table 9. Countries which were exchanging less than a given amount have been sorted by exchanged amount and separated in 3 groups which gave a total exchanged amount reasonable from the point of view of the visualization. The representation is done using Circos [35]