基于区块链的文件验证平台！文件的持有人和使用人可以通过平台验证文件在双方传输过程中是否被篡改平台并不存储您的文件信息，仅是将您的文件进行计算后用于验证的值存放于公共区块链中

bitcoinj项目富含完整demo此项目使用maven构建,不会使用maven的同学,查看项目pom.xml文件,并在http://mvnrepository.com/下载相应的依赖jar包.demo:bitcoinj签名交易/***@paramunSpentBTCList未花费utxo集合*@paramfrom发送者地址*@paramto接收者地址*@paramprivateKey私钥*@paramvalue发送金额.单位:聪*@paramfee旷工费.单位:聪*@return签名之后未广播的原生交易字符串*@throwsException*/publicstaticStringsignBTCTransactionData(ListunSpentBTCList,Stringfrom,Stringto,StringprivateKey,longvalue,longfee)throwsException{NetworkParametersnetworkParameters=null;//networkParameters=MainNetParams.get();//测试网络networkParameters=TestNet3Params.get();Transactiontransaction=newTransaction(networkParameters);DumpedPrivateKeydumpedPrivateKey=DumpedPrivateKey.fromBase58(networkParameters,privateKey);ECKeyecKey=dumpedPrivateKey.getKey();longtotalMoney=0;Listutxos=newArrayList();//遍历未花费列表，组装合适的itemfor(UnSpentBTCus:unSpentBTCList){if(totalMoney＞=(value+fee))break;UTXOutxo=newUTXO(Sha256Hash.wrap(us.getTxid()),us.getVout(),Coin.valueOf(us.getSatoshis()),us.getHeight(),false,newScript(Hex.decode(us.getScriptPubKey())));utxos.add(utxo);totalMoney+=us.getSatoshis();}transaction.addOutput(Coin.valueOf(value),Address.fromBase58(networkParameters,to));//transaction.//消费列表总金额-已经转账的金额-手续费就等于需要返回给自己的金额了longbalance=totalMoney-value-fee;//输出-转给自己if(balance＞0){transaction.addOutput(Coin.valueOf(balance),Address.fromBase58(networkParameters,from));}//输入未消费列表项for(UTXOutxo:utxos){TransactionOutPointoutPoint=newTransactionOutPoint(networkParameters,utxo.getIndex(),utxo.getHash());

以太坊（英语：Ethereum）是一个开源的有智能合约功能的公共区块链平台。
通过其专用加密货币以太币（Ether，又称“以太币”）提供去中心化的虚拟机，这是其最新的源代码，是go语言版本。

送你一把打开区块链世界大门的钥匙，相信《精通比特币第二版》会成为你最好的入门书籍，即便你有了一定的基础，偶尔翻一翻都会有不一样的收获。

Theoveralltechnicalarchitectureconsistsofthreeplatforms:1.Socialmediaplatform:thisisanapplicationlayer;2.Block-chainplatform:acoreblockchain-basedfunctionalmoduleisoffered:(1)Contractlayer:amultilingualsmartcontractsplatform;(2)Consensuslayer:aFastPaxos-basedPoSconsensusalgorithm.3.P2P-baseddistributedstoragesystem:asupportlocatedatthebottom:(1)Networklayer:customizedcontent-addressableP2Pstoragenetwork;(2)Datalayer:datastorageisbasedonLevelDB/CouchDB.

个人收集的蓝宝石超白金三星56和64的原版BIOS，其中56有180w和220w，64只有一个OC240w的

Blockchainisanemergingtechnology,withalmostdailyannouncementsonitsapplicabilitytoeverydaylife.Itisperceivedtoprovidesignificantopportunitiestodisrupttraditionalproductsandservicesduetothedistributed,decentralisednatureofblockchains,andfeaturessuchasthepermanenceoftheblockchainrecord,andtheabilitytorunsmartcontracts.Thesefeaturesmakeblockchaintechnology-basedproductsorservicessignificantlydifferentfrompreviousinternet-basedcommercialdevelopmentsandofparticularinteresttotheeducationsector–althougheducation,withsomeminorexceptions,isnotcurrentlyperceivedtobehighontheagendaofmostcountrieswithnationalblockchaininitiatives.Inaddition,currentlystakeholderswithineducationarelargelyunawareofthesocialadvantagesandpotentialofblockchaintechnology.Thisreportwasproducedtoaddressthisgap.ContextBlockchaintechnologyisforecasttodisruptanyfieldofactivitythatisfoundedontimestampedrecord-keepingoftitlesofownership.Withineducation,activitieslikelytobedisruptedbyblockchaintechnologyincludetheawardofqualifications,licensingandaccreditation,managementofstudentrecords,intellectualpropertymanagementandpayments.

区块链高级实战课程project

YOCSEF20周年暨YEF2018会议，有关区块链安全的PPT分享。