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。

想从事区块链开发，对比特币源码的编译和分析是一条捷径，网上对比特币源在Windows下的编译且能用的的文档比较少，经过一段时间的实践，通过查阅相关资料，实现了比特币0.9.4版本源码（bitcoin-0.9.4）在Win7x64+VS2013中的工程化编译。