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summary: Blockchain: in essence, it is a distributed ledger, which is distributed all over the world and is difficult to be tampered with Ethereum Eth: Eth is a kind of blockchain technology and the second elder brother in the blockchain (the eldest brother is bitcoin) Financial attribute of blockchain: establish an online trading system ...

In this article / tutorial, I'll show you how to use js-conflux-sdk To build a simple DApp.through the use of js-conflux-sdk This integrated development library based on JavaScript language, combined with npm package management, can develop DApp based on Conflux network, develop, compile and deploy interested smart contracts to Conflux network. ...

The meeting of graphql and react Remember that I posted a subgraph on the graph and I've been thinking about how to get data out of it. Because I cooked too much, I thought about a lot of ways. First, I consider how this subgraph works, using the graphql query language. (I won't talk about the graphs here, the explanations on the website, ...

Here's the table of contents: Analyze bitcoin blockchain using graph data The whole process is to obtain data from one format (blockchain data) and convert it to another format( Graphic database ). The only thing that makes this conversion more difficult than typical data conversion is the understanding of data format; Before starting ...

Author: chirpyliSource: Hang Seng LIGHT cloud communityOverview of mining processBitcoin mining is actually a bitcoin node, which packages transactions into blocks and gets bitcoin incentives while obtaining bookkeeping rights. The main mining process is as follows:Collect the transactions broadcast on the network, verify and join the transacti ...

Using private data in Fabric This tutorial will demonstrate how to use collections to store and retrieve private data on authorized Peer nodes in the blockchain network. This tutorial requires that you have mastered private data storage and how to use it. For more information, see private data. annotation This tutorial uses the new chai ...

DID decentralized digital identity identity The International Electronic Technology Commission defines "identity" as "a set of attributes associated with an entity". The entities here are not only people, but also machines or objects. Even virtual things in the network can also be entities and have identities. Digital ide ...

Fabric 2.2.0 Test the network using Fabirc 1. Environmental preparation https://hyperledger-fabric.readthedocs.io/zh_CN/release-2.2/install.html Install docker curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun Install docker-compose curl -L https://github.com/docker/compose/releases/download/1.27.2/docker-compose-`uname ...

catalogue err="authentication needed: password or unlock"Error: authentication needed: password or unlock undefined Object has no number say:   hello.say() cannot be called miner is needed at this time   To dig the mine (bookkeeping) A Contract appears   mined !   hello.say() Construction of development environment Sol ...

A case analysis of blockchain based on DPoS consensus algorithm1, ForewordEarlier, we introduced the cases of PoW and PoS, and we will find that both of them have some disadvantages. For example, PoW consumes more energy, and the more coins PoS holds, the greater the probability of successful mining, which will lead to a widening gap between th ...