Quorum Whitepaper v0.2.zip

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block chain user guide for programmer
Quorum Whitepaper v0.2.zip
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<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6251548f74bc5c01059a1dcf/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6251548f74bc5c01059a1dcf/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h3 y4 ff2 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m1 x1 h4 y5 ff3 fs1 fc0 sc0 ls0 ws0">Q<span class="_ _0"></span>uo<span class="_ _0"></span>r<span class="_ _0"></span>u<span class="_ _0"></span>m<span class="_ _0"></span> <span class="_ _0"></span>W<span class="_ _0"></span>h<span class="_ _0"></span>i<span class="_ _0"></span>t<span class="_ _0"></span>e<span class="_ _0"></span>pa<span class="_ _0"></span>p<span class="_ _0"></span>e<span class="_ _0"></span>r<span class="_ _0"></span><span class="ff4"> </span></div><div class="t m2 x1 h5 y6 ff4 fs2 fc0 sc0 ls0 ws0">1<span class="ff5"> <span class="_ _1"> </span></span>Introduction </div><div class="t m0 x1 h2 y7 ff1 fs0 fc0 sc0 ls0 ws0">Smart Contracts on a replicated, shared<span class="_ _2"></span> ledger hold the promise of impro<span class="_ _2"></span>ving efficiency and lowering </div><div class="t m0 x1 h2 y8 ff1 fs0 fc0 sc0 ls0 ws0">costs compared with existin<span class="_ _2"></span>g enterprise systems based on duplicated busine<span class="_ _2"></span>ss logic and consensus by </div><div class="t m0 x1 h2 y9 ff1 fs0 fc0 sc0 ls0 ws0">reconciliation. Existing smart contract syste<span class="_ _2"></span>ms on replicated shared ledgers are un<span class="_ _2"></span>able to provide data </div><div class="t m0 x1 h2 ya ff1 fs0 fc0 sc0 ls0 ws0">privacy; transactions and smart contract stat<span class="_ _2"></span>e data are exposed in the clear <span class="_ _2"></span>on the replicated shared </div><div class="t m0 x1 h2 yb ff1 fs0 fc0 sc0 ls0 ws0">ledger. A number of proposals t<span class="_ _2"></span>o address the lack of data privacy with Smart Co<span class="_ _2"></span>ntracts are beginning to </div><div class="t m0 x1 h2 yc ff1 fs0 fc0 sc0 ls0 ws0">emerge involving methodologies such as h<span class="_ _2"></span>omomorphic encryption, zero-knowled<span class="_ _2"></span>ge proofs, secure </div><div class="t m0 x1 h2 yd ff1 fs0 fc0 sc0 ls0 ws0">multi-party computation, ledg<span class="_ _2"></span>er segmentation, cryptographic pro<span class="_ _2"></span>tocols, etc. This paper outlines a<span class="_ _2"></span> </div><div class="t m0 x1 h2 ye ff1 fs0 fc0 sc0 ls0 ws0">simpler approach to privacy built on the Ether<span class="_ _2"></span>eum platform. Though the design is simple, the<span class="_ _2"></span> solution </div><div class="t m0 x1 h2 yf ff1 fs0 fc0 sc0 ls0 ws0">preserves many of the key attributes of <span class="_ _2"></span>Ethereum such as ensuring e<span class="_ _2"></span>very node on the netw<span class="_ _2"></span>ork </div><div class="t m0 x1 h2 y10 ff1 fs0 fc0 sc0 ls0 ws0">participates in and increases the <span class="_ _2"></span>overall security of the entire network while onl<span class="_ _2"></span>y revealing the details of </div><div class="t m0 x1 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0">private transactions to those party to the transa<span class="_ _2"></span>ctions. </div><div class="t m0 x1 h2 y12 ff1 fs0 fc0 sc0 ls0 ws0">This paper focuses on the modifications t<span class="_ _2"></span>o standard Ethereum in order to supp<span class="_ _2"></span>ort the desired </div><div class="t m0 x1 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">&#8216;Enterprise&#8217; requirements. This pap<span class="_ _2"></span>er assumes the reader is familiar with Eth<span class="_ _2"></span>ereum and has read the </div><div class="t m0 x1 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">Ethereum whitepaper</div><div class="t m3 x2 h6 y15 ff1 fs3 fc0 sc0 ls0 ws0">1</div><div class="t m0 x3 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">. </div><div class="t m2 x1 h5 y16 ff4 fs2 fc0 sc0 ls0 ws0">2<span class="ff5"> <span class="_ _1"> </span></span>Quorum </div><div class="t m0 x1 h2 y17 ff1 fs0 fc0 sc0 ls0 ws0">Quorum is a private/permissioned blockchain ba<span class="_ _2"></span>sed on the official Go implementation <span class="_ _2"></span>of the Ethereum </div><div class="t m0 x1 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">protocol</div><div class="t m3 x4 h6 y19 ff1 fs3 fc0 sc0 ls0 ws0">2</div><div class="t m0 x5 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">. Quorum uses a &#8216;raft-based&#8217; c<span class="_ _2"></span>onsensus algorithm (a consensus m<span class="_ _2"></span>odel for faster blocktimes, </div><div class="t m0 x1 h2 y1a ff1 fs0 fc0 sc0 ls0 ws0">transaction finality and on-demand block <span class="_ _2"></span>creation), and achieves Data Privacy through the intr<span class="_ _2"></span>oduction </div><div class="t m0 x1 h2 y1b ff1 fs0 fc0 sc0 ls0 ws0">of a new &#8220;private&#8221; transaction type. One of<span class="_ _2"></span> the design goals of Quorum is to reuse as <span class="_ _2"></span>much existing </div><div class="t m0 x1 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">technology as possible, minimizing<span class="_ _2"></span> the changes required to go-ethereum in orde<span class="_ _2"></span>r to reduce the effort </div><div class="t m0 x1 h2 y1d ff1 fs0 fc0 sc0 ls0 ws0">required to keep in sync wi<span class="_ _2"></span>th future versions of the publ<span class="_ _2"></span>ic Ethereum code base. </div><div class="t m0 x1 h2 y1e ff1 fs0 fc0 sc0 ls0 ws0">Much of the logic responsible for the additional priva<span class="_ _2"></span>cy functionality resides in a layer that si<span class="_ _2"></span>ts atop the </div><div class="t m0 x1 h2 y1f ff1 fs0 fc0 sc0 ls0 ws0">standard Ethereum protocol layer. Figure <span class="_ _2"></span>1 below provides a high-level overview <span class="_ _2"></span>of the Quorum </div><div class="t m0 x1 h2 y20 ff1 fs0 fc0 sc0 ls0 ws0">blockchain platform and architectural comp<span class="_ _2"></span>onents. </div><div class="t m0 x1 h2 y21 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h2 y22 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _3"></span> <span class="_ _4"></span> </div><div class="t m4 x1 h7 y23 ff1 fs4 fc0 sc0 ls0 ws0">1</div><div class="t m5 x6 h8 y24 ff1 fs5 fc0 sc0 ls0 ws0"> <span class="fc1">https://githu<span class="_ _0"></span>b.com/ethereu<span class="_ _0"></span>m/wiki/wiki<span class="_ _0"></span>/White-Pap<span class="_ _0"></span>er</span> </div><div class="t m4 x1 h7 y25 ff1 fs4 fc0 sc0 ls0 ws0">2</div><div class="t m5 x6 h8 y26 ff1 fs5 fc0 sc0 ls0 ws0"> <span class="fc1">https://githu<span class="_ _0"></span>b.com/ethereu<span class="_ _0"></span>m/go-ether<span class="_ _0"></span>eum</span> </div><div class="c x7 y27 w2 h9"><div class="t m0 x0 h2 y28 ff1 fs0 fc0 sc0 ls0 ws0"> </div></div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div> </body> </html>
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