how to make blockchain

Feel the current blockchain development trend and 10几 years ago Grid computing is very similar, the idea of grid computing has moved a lot of people, including IBM, many companies, have been actively involved in research, especially in the domestic institutions, research institutions, and even considered the second internet revolution, China has overtaken America's opportunity in the field of Internet technology. However, the actual situation shows th

after the previous chunk in chronological order, otherwise the hash value of the previous chunk is unknown. It is an important concept of Bitcoin. Characteristics Blockchain has the following characteristics: Decentralized: The blockchain does not depend on a central node, but rather on the distributed nodes. No need to trust the system: The blockchain

Write the first Java chain code programIn the previous section, you are already familiar with how to build, run, deploy, and invoke chain code, but have not yet written any Java code.In this section, you will use the Eclipse IDE, a Gradle plug-in for Eclipse, and a Java chain Code framework project called Chaincodetutorial to write the first Java chain Code program. You'll get the skeleton code from the GitHub repository I created for this tutorial, import that code into Eclipse, add code to

first smart contract Currently Browser-solidity has two common debugging methods, one is to use local virtual Machine debug mode, one is connected to the local private chain for debugging. 1. Local virtual machine Debug mode Local virtual machine debugging, is not connected to any one node, in memory virtual out of an Ethereum node for debugging, the advantage is fast, simple configuration, the disadvantage is because it is only virtual debugging, may finally put on the real

This article is based on the Geth client mentioned earlier in this article, explaining how to build your own private chain, as well as account management and transfer transactions. 1. The Genesis block file The first chunk on the blockchain is called the Genesis block, and the creation of our private chain can be declared and defined by the creation block configuration file. Store the following file contents as a Genesis.json file { "Coinbase": "0

" : "0x0000000000000000000000000000000000000000000000000000000000000000", "timestamp" : "0x00" } Step 2: Execute commands to create a Genesis blockSwitch back to the command line, execute the command, create the creation block into the Geths directory, execute the command geth--datadir "./" Init Genesis.json the current geths directory will now add two folders Geth and KeyStore Geth the data stored in the blockchain is the keystore of the user inf

Lihe August 28, 2016 Many people are puzzled by the blockchain and Ethereum, do not know how to learn, this article briefly discussed some of the learning methods and resources. I. The relationship between Ethereum and blockchain From the blockchain history, Bitcoin was first born, there was no blockchain technology

, specify the Chaincode to be called by Chaincodeid, as shown above, Chaincode is Fabcar. So what does this chaincode, named Fabcar, look like? Take a look at the code. First of all, this chaincode is placed under this directory: Open this chaincode source file, is written in the go language, the top defines the smartcontract and car two classes, wherein car is the main model object, there are several properties Make,model. The following two method

reprint: http://blog.csdn.net/sportshark/article/details/52351415 Bo Master Summary of the content is very detailed, collection. I. The relationship between Ethereum and blockchain From the blockchain history, Bitcoin was first born, there was no blockchain technology and terminology, and the industry extracted the technology architecture and system from Bitc

This is a creation in Article, where the information may have evolved or changed. The series of articles I have put on GitHub: blockchain-tutorial, Updates will be on GitHub, and may not be synced here. If you want to run the code directly, you can clone the tutorial repository on GitHub and go to the SRC directory to execute make . In the previous article, we constructed a very simple data structure, w

package, when we download a software installation package, you can use the hash function to calculate the hash value of the software installation package, and then the software installation package to compare the test code, you can know the download of the installation package is complete, Whether there is data loss. In the blockchain, the hash value is used to guarantee the consistency of the block. Each chunk is used to hash the data that contains

Open source: Name Public Knowledge algorithm Fit scene Development language Smart Contracts Tps Bitcoin 1.0 POW Public chain C++ Whether 7 Ethereum ETH 1.0 POW Gang Chin/Alliance Chain GO Is 25 IBM HyperLedger Fabric PBFT mainly Alliance Chain GO Is 100K Bit shares BitShare DPos Alliance Chain C++ Whether 500 Notary Pass Facto

Recently in the development of an application based on the Ethereum blockchain, so the internet search data, found on-line data too little, because this technology in the domestic less research, many problems can not find the answer, I will these two days of their own summary written, hoping to help everyone First of all we want to download the Ethereum client tool, I refer to the online video "Http://ethcast.com/v1", because I do not have any basis

For the upcoming block chain Project, will usher in a new investment vacuum, the following investment seven principles, for your reference: 1. Does the world really need this thing? (Just need) 2. Resolved what did not solve the problem originally. (a bitcoin-like digital currency is a less sensible option) 3. Is it really necessary to go to the center of the matter? (exchanges do not need to be centralized) 4. Is it really necessary to make