Bitcoin 2014 4 19 IS Report No. 2014041902 Report Medical Information System Labratry
Abstract Bitcoin P2P (Pear To Pear)
1............................ 2 2 Bitcoin.......................... 3 3 Bitcoin........................ 4 3.1............................. 4 3.2......................... 4 3.2.1...................... 4 3.2.2..................... 5 3.2.3.......................... 7 3.3.......................... 7 4 Bitcoin.......................... 8 4.1......................... 8 4.2.......................... 8 4.3.......................... 8 5........................... 9 6............................. 10
1 3 Bitcoin Bitcoin PC PC (Personal Computer) P2P 1) NBA (National Basketball Association) Bitcoin 2) ATM (Automated Teller Machine) Bitcoin ATM 3) Bitcoin 140 4) Bitcoin 2
2 Bitcoin Bitcoin 2008 P2P Bitcoin 2009 Bitcoin Bitcoin 2009 Fig. 2.1 175 150 ユーザー 数 ユーザー 数 [ 万 人 ] 125 100 75 50 25 0 2009 2010 2011 2012 2013 2014 日 付 [ 年 ] Fig. 2.1 ( 4) ) 3
3 Bitcoin 3.1 Bitcoin miner PC Bitcoin 50 mining mining Bitcoin Bitcoin mining 2100 Bitcoin 5) 2013 11 1200 Bitcoin 2140 100 5) Bitcoin mining mining Bitcoin Bitcoin 3.2 3.2.1 Bitcoin Bitcoin Fig. 3.1 1) 1 Bitcoin Hash 2 Hash 3 4 Bitcoin Hash 3 5 6 7 Bitcoin Bitcoin 4 Fig. 3.1 5 4
3.2 3 Bitcoin Fig. 3.1 ( ) PC Bitcoin Bitcoin 6 Bitcoin 6 3.2.2 Bitcoin 10 10 10 10 5) Fig. 3.2 1) 1 miner Hash nonce 2 Hash 3 Hash 5
3.2 3 Bitcoin Fig. 3.2 ( ) 4 Hash 5 Hash Bitcoin 6 Hash 7 nonce, 1 miner mining miner 2 Hash Hash Hash nonce Hash hash Hash Hash Hash nonce Hash nonce nonce Hash miner 3 Hash Hash Hash 4 6
3.3 3 Bitcoin Hash Hash Bitcoin Bitcoin 50Bitcoin miner 25Bitcoin Bitcoin Bitcoin 3.2.3 Bitcoin miner Bitcoin mining Bitcoin Bitcoin Hash Hash Hash Hash Hash Hash Bitcoin Hash Bitcoin 3.3 Bitcoin Bitcoin 2100 Bitcoin 10 Bitcoin Bitcoin 7
4 Bitcoin 4.1 Bitcoin Bitcoin 6) Bitcoin 4.2 2100 Bitcoin Bitcoin Bitcoin Bitcoin Bitcoin Bitcoin 4.3 Bitcoin Bitcoin 2100 Bitcoin 2014 2 Bitcoin Mt.GOX 270 2 7500 Bitcoin 7) 8
5 Mt.GOX Bitcoin Mt.GOX Bitcoin Mt.GOX Bitcoin 8) Bitcoin Bitcoin Bitcoin 8) Bitcoin Bitcoin Bitcoin mining Ripple Bitcoin 8) 9
6 Bitcoin Bitcoin P2P Bitcoin 9) 10
1) Satoshi Nakamoto. Bitcoin:A Peer-to-Peer Electronic Cash System. 2008. https://bitcoin.org/bitcoin.pdf. 2) THE WALL STREET JOURNAL. http://jp.wsj.com/article/sb10001424052702303996604579364232991867734.html, 2014/04/10. 3) THE WALL STREET JOURNAL. http://jp.wsj.com/article/sb10001424052702303919304579326122618947760.html, 2014/04/10. 4) BLOCKCHAIN. https://blockchain.info/ja/charts/my-wallet-n-users, 2014/04/10. 5). http://jp.reuters.com/news/technology/bitcoin, 2014/04/10. 6).. http://www.komei.or.jp/news/detail/20140306_13434, 2014/04/10. 7). http://jp.reuters.com/article/jp_bitcoin/idjptyea3102520140402, 2014/04/10. 8).. http://jp.reuters.com/article/jp_bitcoin/idjptyea2d08x20140314, 2014/04/10. 9). http://www.nikkei.com/article/dgxnasgm2701q_q4a330c1ff8000/, 2014/04/10. 11