Ethereum public chain DAPP

1.

blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum

blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies

blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

extended data

according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:

1. The blockchain with the whole network open and without user authorization mechanism is called public chain

2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain

3. All the nodes in the network are in the hands of one organization, which is called private chain

alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain

blockchain features

1, decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain

2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent

3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention

4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes

5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously

2.

what is Ethereum:

Ethereum is an innovation based on the application of technologies and concepts in bitcoin to computers. Ethereum itself imitates a lot of bitcoin technology to maintain the computer platform. Blockchain technology is one of them
Ethereum platform can safely run any program users want

advantages of Ethereum over other competitive currencies before Ethereum appeared, some digital currencies imitated bitcoin. However, these projects have their own shortcomings, they can only support one or several specific applications at the same time< However, the reason why Ethereum can surpass the limitations of these projects in the past is because of the core idea of Ethereum

what Ethereum wants to implement is a blockchain protocol with built-in programming language. Since it supports programming language, in theory, any blockchain application can be defined with this language, and then run on Ethereum's blockchain protocol as an application

The design of Ethereum is very flexible and adaptable

Ethereum target sets the advantages of blockchain technology, in order to add the advantages of blockchain, such as decentralization, openness and security, to almost all computing fields

blockchain applications of Ethereum

Ethereum has many blockchain applications, such as digital applications of gold and stocks, financial derivatives applications, DNS and digital authentication, etc

Ethereum has achieved more than 100 blockchain applications by many start-ups

Ethereum has also been closely watched by some financial institutions, banking consortia (such as R3), as well as large companies like Samsung, Deloitte, RWE and IBM. As a result, a number of blockchain applications such as simplified and automated financial transactions, merchant loyalty index tracking, and gift cards designed to achieve decentralization of electronic transactions have emerged

the relationship between Ethereum and blockchain:

Ethereum is a programmable blockchain

Ethereum does not give users a series of preset operations (such as bitcoin transaction), but allows users to create complex operations according to their own wishes

in this way, Ethereum can be used as a platform for various types of decentralized blockchain applications, including but not limited to cryptocurrency

like other blockchains, Ethereum also has a peer-to-peer network protocol. Ethereum blockchain database is maintained and updated by many nodes connected to the network. Each network node runs the Ethereum simulator and executes the same instructions. Therefore, people sometimes call Ethereum "world computer"

3. The digital currency

issued based on Ethereum public chain should be observed according to the price trend of the platform.

4.

Public chain, also known as "public chain", refers to the blockchain that anyone in the world can enter the system at any time to read data, send confirmatory transactions and compete for bookkeeping. The public chain is generally considered to be "completely decentralized", because no indivial or institution can control or tamper with the reading and writing of data in it. In terms of application, blockchain public chain mainly includes bitcoin, Ethereum, super ledger, most counterfeit currencies and smart contracts. The ancestor of blockchain public chain is bitcoin blockchain, which has the following characteristics:

1, open source code

upload the code to GitHub, and everyone can get complete blockchain data by downloading, Accept the test of the public

2, complete decentralization

anyone can become a node, each node is open, everyone can participate in the calculation of the blockchain, any node is not permanent, but phased, and any center is not mandatory for nodes. Anyone can read and send transactions, and transactions can be effectively confirmed on the blockchain. Anyone can participate in the consensus process. The consensus process determines whether a block can be added to the blockchain and the exact current state. Everyone can get financial reward from it, which is proportional to their contribution to the consensus process. These public chains are generally considered to be "completely decentralized"

3. Developing decentralized applications

through this public chain, developers can easily develop centralized applications. Public chain can protect the rights and interests of users from the influence of program developers

5. We all know that app refers to client application, which is the abbreviation of application. DAPP is d + app, and D is the first letter of decentralization in English. When translated into Chinese, DAPP is decentralization, that is, DAPP is decentralized application

first of all, it must be pointed out that the relationship between DAPP and app is not the relationship between who replaces who or who eliminates who, but the coexistence relationship, or DAPP is the enrichment and improvement of app< Secondly, DAPP is the proct of the development of the times and the progress of science and technology

because DAPP is directly linked to blockchain technology, it is associated with transaction data, transaction assets, and tamperable decentralized storage< In his book decentralized applications, Johnston believes that a DAPP application should meet all the following conditions:

1. An application must be completely open source, autonomous, and no entity controls most of its tokens. The application must be able to upgrade according to the market feedback and technical requirements, but the upgrade can only be carried out after the application users reach a consensus< Second, the application data must be encrypted and stored on the public blockchain

3. The application must have a token mechanism (it can use the existing token or issue a new built-in token), and the miner or application maintenance node needs to get token reward

fourthly, the generation of application token must be based on the standard encryption algorithm, and valuable nodes can get the token reward of the application according to the algorithm

in short, an application running on the public chain in the form of smart contract can be called DAPP. Different from the conventional app, DAPP's logic (source code), stored proceres and stored results are open and transparent, and can't tamper with the storage logic and content< At present, dapps meeting the above conditions include the following categories:

content dapps -

the coupling between blockchain and content vertical field is very good. Using the characteristics and technology of blockchain, there are more and more platforms to do content, and the competition on this track is extremely fierce, such as steemit abroad, currency, Primas, fulcrum, Youxiang, etc Pressone et al<

DAPP for games -

such as the "blockchain cat raising" incident, which was very popular last year. In this game, players can buy, sell and breed different kinds of kittens. The popularity of this game even caused serious congestion of Ethereum network. Now the blockchain game is not limited to the Buddhist pet game, other blockchain Gobang, drifting bottle, card games and so on

with the development of the times and the more mature and popular blockchain technology, DAPP will be paid more and more attention, and more and more dapps will appear in various scenes of life.

6. Buy a lot of bitcoin and let it continue to buy high and sell low. If you can hold on, bitcoin may be short
as long as you can continuously spread the shortcomings of bitcoin and rece the number of people who hold bitcoin, it will basically affect the operation of the exchange. If bitcoin can't be traded, it will only have some academic research value

7. Coinpay is a public chain with independent wallets

8. It's not difficult. I'm good at it

9. DAPP has been highly expected since its birth. Relying on Ethereum, EOS and other public chain platforms, many development teams have released a large number of dapps. However, on the whole, DAPP is in its early stage, and its development is still in a dilemma. It has been five years since Ethereum published its white paper in 2013, and the number of dapps has reached more than 1000. On the new generation of public chain represented by EOS, the number of dapps is still rare
these dapps generally have many problems, such as less daily active users, weak foundation and so on. But in the instry, it is generally expected. Compared with the development process of app, instry insiders said that DAPP still needs to overcome several difficulties in the future, such as stable and efficient public chain, developer ecology and user threshold. DAPP is now regarded as an important way to promote blockchain to ordinary people. It is not realistic to replace app with the current development speed of DAPP
however, if DAPP gives full play to its advantages in some areas, it will still pose a certain threat to app, which also depends on the development of blockchain. Dappdiscovery is also based on the present, starting a series of DAPP reports, DAPP market analysis, and the most fun DAPP game evaluation, trying to bring interesting and informative content sharing to all users.

10. First of all, coin an intelligent chain is the first one to launch a public chain in the exchange, which has attracted a large number of users of the centralized exchange. Moreover, the public chain of the exchange is not so much fork Ethereum as fork coin an intelligent chain, and heco has also made its own fork disabled.