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Blockchain區(qū)塊鏈公開課Whatisblockchain?trade默克爾樹Eachtransactioninthesetthatmakesupablockisfedthroughaprogramthatcreatesanencryptedcodeknownasthehashvalue.HashvaluesarefurthercombinedinasystemknownasaMerkleTree.Theresultofallthishashinggoesintotheblock’sheader,alongwithahashofthepreviousblock’sheaderandatime-st.Theheaderthenbecomespartofacryptographicpuzzlesolvedbymanipulatinganumbercalledthenonce.Onceasolutionisfoundthenewblockisaddedtotheblockchain.代碼加密時間戳加密NumberonceWhataretheapplicationofblockchain?

DistributionShoppingTrustInternetTransactionSecurity……分布式賬本添加幻燈片標(biāo)題-1decentralization去中心化Ifyou'reahackerYouwillAttack?BANKBlockchainAcentralizedledgertracksassetmovementswithinthefinancialsystembetweeninstitution.Adistributedledgereliminatestheneedforcentralauthoritiestocertifyassetownership.Institutionstocutdownonfraudandmanipulation.欺詐

TraditionaldataglobalizationBlockchainSecurityThankyou!BlackTechnologyinAmericanelection毛承蔚Paylessbut

gainmore？？！300million>400million？Thankstobigdatahiahiahia~~~~~~NateSilver◆In2008，Itpredicted49ofthe50stateselectionscorrectly.

◆In2012，Itpredictedall50stateselectionscorrectly.Then...Proposed"bigdataresearchanddevelopmentinitiative"Investmorethan200milliondollars.Improvecollection,storage,retention,management,analysisandThecoretechnologiesneededtosharevastamountsofdata.So...now...Therearemorethan772datacentersisrunning,Withmorethan70,000servers,Andabout7millioncomputerterminals.GOODJOB!!whoisthenext?Aelectionwithstrongbigdatagene.Inthiselection,thetechnologyteamthatservedMrsClinton'selectionhasmorethan50people,theequivalentofasmallsiliconvalleytechstart-up.HillaryClinton,$240million.PageRank

李存益PageRank

-AwonderfulwaytoidentifythelevelandimportanceofawepageThebasicalgorithm:1.everywebpagewillgetthesamePageRankatfirst2.Executethefollowingcycle:EachpageassignsitscurrentPageRankequallytotheoutwardlinksonthispage,sothateachlinkgetsthecorrespondingPageRank.Foreachcycle,thenewPageRankisobtainedbysummationofallthePageRankthatispassedininwardlinksofthispage.3.Afterseveralcycle,thePageRankofeverywebpagewon'tchangeanymore.AndthemorehigherthePageRank,themoreimportantthewebpage.SimplifiedAlgorithmL:thenumberofoutwardliknksPR:thePageRankinthiscycleq:Dingfactor:theprobabilitythatauserreachesawebpageandcontinuestobrowsebackwardsatanytime.Advantage:Itisastaticalgorithmwhichisindependentofthequery.AndthePageRankofallwebpagesisobtainedbyofflinecalculation.Iteffectivelyreducetheamountofcomputationinonlinequery,greatlyreducethequeryresponsetime.disadvantage:P

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