https://insightcrime.org/news/digital-gold-rush-how-bitcoin-helps-organized-crime/
https://trybunal.gov.pl/en/hearings/judgments/art/11662-ocena-zgodnosci-z-konstytucja-rp-wybranych-przepisow-traktatu-o-unii-europejskiej
http://muse.jhu.edu/article/683632/pdf