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Truffle development framework provides two methods for testing Ethereum smart contract: solid testing at blockchain level and JavaScript testing at DApp level. In this tutorial, we will introduce the purpose, difference and application scenario of these two testing methods of Ethereum smart contract, and learn how to use the solid test case and ...

There are two related concepts in Hyperledger Fabric: Private Data and Transient Data. This paper provides four example programs, which correspond to the four combinations of Private Data and Transient Data. By observing the transactions of account books and the world state database, we can understand why Transient Data should be used as input ...

Preface HANS123 strategy was first used in the foreign exchange market. Its trading mode is relatively simple and belongs to the trend breakthrough system. This trading mode can enter the market at the first time when the trend is formed, so it is favored by many traders. So far, HANS123 has expanded many versions. Today, we will understand HA ...

Hyperledger Fabric provides software development kits/SDKs to help developers access the fabrics network and chain codes deployed on the network, but Hyperledger Fabric does not officially provide an easy-to-use REST API access interface. In this tutorial, we will learn how to use Hyperledger Fabric's SDK to develop a REST API server. 1. Overvi ...

The principle will not be introduced. You can see another one of mine Deeply understand the operation principle of blockchain through an App Demo demonstration The code is only the simplest. It simply implements the definition of a block and the connection between blocks. There is no p2p, incentive or consensus. Important da ...

The blockchain tutorial Fabric1.0 source code analysis configtx ා genesis, in the second half of 2018, the blockchain industry is gradually fading away from the impetuosity and returning to rationality at the beginning of development. On the surface, the demand and value of relevant talents seem to be falling. But in fact, it is the gradual dec ...

Blockchain tutorial's Fabric1.0 source code analysis Ledger II. Ledger of Fabric 1.0 source code Notes Supplement the definition of commonledger.Ledger interface embedded in PeerLedger interface as follows: type Ledger interface {     GetBlockchainInfo() (*common.BlockchainInfo, error) //Get the basic information of blockchain     GetBlockByNum ...

The signpost Ether square Block chain Dapp Taifang hello world Environmental Science windows 10 64bit Reference blog youclavier -- Voting Dapp Course in ETF background To take over an IPFS+Ethereum project, learn about Ethereum and try to complete a Hello World project. step Refer to my other blog. Install nvm Install node 9.11.1 and switch ...

This tutorial describes how to use c-lightning of Liquid side chains to create lightning payment channels. Using these payment channels, users can trade Liquid-BTC in real time and privately. Liquid networks include support for private transactions and asset issuance, so users can use lightning payment channels to trade any assets issued on Liq ...

The purpose of this series of tutorials is to help you understand how to develop block chain technology. In this tutorial, we will: Create your first very basic block chain. Implement a simple workload certification system (mining). Explore any possibility. I assume you have a basic understanding of object-oriented programming. It is notewort ...