블록체인과 비트코인, 4차 산업혁명

https://youtu.be/50vkDTiCU3w

https://youtu.be/hODkFGstLgI

http://freemoa-blog.com/m/585

http://m.blog.daum.net/_blog/_m/articleView.do?blogid=0Cpfz&articleno=2029

http://m.hemophilia.co.kr/news/articleView.html?idxno=4538#_enliple

http://m.zdnet.co.kr/news_view.asp?article_id=20180328071458#imadnews