Programmer Group

Fabric CA is a certificate management tool of Hyperledger Fabric, which is very convenient for development and testing. In this tutorial, we will explore the use of fabric Ca and use it to complete user registration / Register and registration / Enrollment. Hyperledger Fabric is a licensed blockchain platform. Before accessing the Fabric networ ...

In the second half of 2018, the blockchain industry is gradually fading away from the impetuosity and 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 decline of the initial bubble that gives people more attention to the real technology of th ...

Ledger (statedb) of Fabric 1.0 source code note 1. Overview of statedb statedb, or VersionedDB, the state database, stores the latest values of all keys in the transaction log, also known as world state. You can choose to implement it based on leveldb or cauchdb. Statedb. The code is distributed in the core/ledger/kvledger/txmgmt/statedb di ...

Catalog 1. Concept of bloon filter 2. Application scenario of bloon filter 3. Working principle of bloon filter 4. Advantages and disadvantages of bloon filter 5. Precautions for bloon filter 6. Go to realize bloon filter 1. Concept of bloon filter Bloom filter is a binary ve ...

This tutorial shows you how to use.NET Core to develop a simple Hyperledger Fabric chain code for basic asset management and transfer operations.If you're a skilled.NET/C# developer and need to use Hyperledger Fabric as a block chain platform for a variety of reasons, this is an alternative to turning around and throwing yourself into Java/Node ...

Coin station log 1 -- Python 3 crawler crawling blockchain news Blockchain is very popular recently, so I want to be a news crawling and analysis type media website. I can do it as soon as I say, but I always need a data source to be a media website. Where does the data source come from? I'll write this thing later. First, crawling... Anyway, ...

Author of this article: Yang Wei of Xianhe system; original works, reprint please indicate the source Catalog Link: 1 filecoin concept Link: 2 filecoin common language understanding Link: 3 filecoin development network usage Link: 4 Analysis of top-level architecture of filecoin source code Link: 5 heartbeat protocol of filecoin ...

Server configuration: Operating system: ubuntu 16.04 CPU: 4U Memory: 16G ා generally speaking, 4G is enough, but if you want to check the history, you need to load the complete transaction index table tindex, which results in 8G + memory Hard disk: 500G bitcoin has been running since 2008, with a large amount of data accumulated, and ...

I. Basic API for file operation func main() { //Absolute path fileInfo , err := os.Stat("E:/a.txt") fileInfo , err = os.Stat("E:/") if err !=nil { fmt.Println("err:" , err.Error()) } else { fmt.Printf("%T \n" , fileInfo) fmt.Printf("%v \n" , fileInfo) //file name fmt.Print ...

Substrate is a rapid development framework for developing application specific block chain. Compared with DApp based on public chains such as ETF, the application of specific block chains is a special block chain built around a single application, so it has the greatest flexibility and the least restrictions. This article describes in detail ho ...