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CryptoNote is an application layer protocol that powers several decentralized privacy oriented digital currencies. Conceptually, it is an evolution of ideas behind bitcoin: both are similar in some ways yet different in many others.〔(【引用サイトリンク】url=https://en.bitcoin.it/wiki/CryptoNote ) Bitcoin.it〕 The main difference between the two technologies is that bitcoin (and most digital currencies) is less opaque than CryptoNote-based currencies due to the later's blockchain being almost anonymous, contrary to non-Cryptonote blockchains.〔(【引用サイトリンク】url=http://weeklyglobalresearch.wordpress.com/2014/05/27/research-report-the-most-ethical-and-genuine-altcoins/ ) Weekly Global Research〕 CryptoNote currencies use a distributed public ledger that records all balances and transactions of its in-built currency like bitcoin. Unlike bitcoin, CryptoNote's transactions cannot be followed through the blockchain in a way that reveals who sent or received coins. The approximate amount of a transaction can be known, but the origin, destination, or actual amount cannot be learned. The only information available is that the actual amount was lower than the displayed amount. The only people with access to the whole set of data about a transaction are the sender or receiver of the transaction and the person who possesses one or both secret keys. Another significant difference is hash-based proof-of-work algorithm. Bitcoin uses SHA256, which is CPU-bound function. That means that participants (miners) are only limited by their calculation speeds, and it is relatively cheap to create an application-specific integrated circuit (ASIC) device, which will surpass an ordinary computer in hashes per unit of money.〔(【引用サイトリンク】url=https://en.bitcoin.it/wiki/Mining_hardware_comparison )〕 CryptoNote uses memory bound function CryptoNight, which cannot be easily pipelined.〔(【引用サイトリンク】url=http://bytecoin.org/old/whitepaper.pdf )〕 CryptoNote code was not forked from bitcoin's, so it also has other different inner algorithms, like recalculating new difficulty level or new block size.〔 == Origins == CryptoNote technology was first described in a whitepaper ''CryptoNote v 1.0''.〔(【引用サイトリンク】url=https://cryptonote.org/whitepaper_v1.pdf )〕 An updated version has been released under the name ''CryptoNote v 2.0''〔 later. The Bytecoin cryptocurrency was the first one where the underlying cryptographic protocol has been implemented. CryptoNote was at first developed in Java for faster launch, and then re-written in C++ in 2013. CryptoNote is based on many early works and protocols and takes into consideration several issues raised formerly. Below is the list of most important papers and events influenced CryptoNote: * 1983 – Blind signatures described by David Chaum; * 1997 – HashCash (an instance of a proof-of-work system) invented by Adam Back; * 2001 – Ron Rivest, Adi Shamir, and Yael Tauman proposed ring signatures to the cryptographic community;〔(【引用サイトリンク】url=http://link.springer.com/chapter/10.1007%2F3-540-45682-1_32 )〕 * 2004 – Patrick P. Tsang and Victor K. proposed using the ring signature system for voting and electronic cash;〔(【引用サイトリンク】url=http://eprint.iacr.org/2004/281.pdf ) Department of Information Engineering, The Chinese University of Hong Kong〕 * 2008 – Bitcoin whitepaper published by Satoshi Nakamoto;〔(【引用サイトリンク】url=https://bitcoin.org/bitcoin.pdf ) Bitcoin.org〕 * 2010 - 2012 – Bitcoin Traceability Issue Discussion Gains Steam;〔(【引用サイトリンク】url=https://bitcointalk.org/index.php?topic=5965.msg87757 ) Bitcointalk.org〕 * 2011 – An Analysis of Anonymity in the Bitcoin System, Fergal Reid and Martin Harrigwere;〔(【引用サイトリンク】url=http://anonymity-in-bitcoin.blogspot.ru/2011/07/bitcoin-is-not-anonymous.html )Anonymity in Bitcoin〕 * 2012 – Destination Address Anonymity in Bitcoin (one-time addresses in CryptoNote).〔(【引用サイトリンク】url=http://bitslog.wordpress.com/2012/08/06/destination-address-anonymization-in-bitcoin/ )Bitslog〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CryptoNote」の詳細全文を読む スポンサード リンク
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