Development and construction of EOS Digital currency

1.

EOS: EOS can be understood as enterprise operation system, which is a blockchain operating system designed for commercial distributed applications. EOS is a new blockchain architecture introced by EOS software, which aims to realize the performance expansion of distributed applications. Note that it is not a currency like bitcoin and Ethereum, but a token based on the EOS software project, known as blockchain 3.0

The main features of

EOS are as follows:

1. EOS is a bit similar to Microsoft's windows platform. By creating a developer friendly underlying platform of blockchain, it supports multiple applications to run at the same time and provides the underlying template for the development of DAPP

EOS solves the problems of delay and data throughput by means of parallel chain and dpos. EOS can process thousands of data per second, while bitcoin has about 7 transactions per second, and Ethereum has 30-40 transactions per second

There is no service charge for EOS, and the general audience is more extensive. The network and computing resources needed to develop DAPP on EOS are allocated according to the proportion of EOS owned by developers. When you have EOS, it is equivalent to having computer resources. With the development of DAPP, you can lease your EOS to others. From this point alone, EOS has a wide range of value. To put it simply, if you have an EOS, it is equivalent to having a set of rent to collect rent for others, or having a piece of land to rent for others to build a house. digital currency exchange "currency exchange"

development prospects

through a more in-depth understanding of EOS, EOS is quite valuable for investment. First of all, as the first to launch smart contracts, ETH runs smart contracts on eth, which is not free and depends on your gas. If gas runs out, the contract will stop. According to people who have used eth trading platform, it runs slowly and is very expensive, However, there is no such problem in EOS. The operation contract on EOS depends on the number of EOS you have. The more EOS you have, the more you can rent. With the continuous development, the more expensive the price will be; Secondly, it's very simple to develop DAPP on EOS, and you don't need to write many moles, because EOS itself builds the bottom mole for developers, which provides a platform and greatly reces the threshold of development; Thirdly, as an ordinary investor, owning EOS is equivalent to owning real estate, which can be used to rent and earn money. With the development of DAPP, the number of users increases, and the price increases irresistibly

2.

EOS is a public chain system at the bottom of blockchain developed by block. One, which is specially designed to support decentralized application of Commerce, and its code is open source

bitcoin is called blockchain 1.0 because it opens up the world of digital cryptocurrency and takes a decisive step from 0 to 1

Ethereum is known as blockchain 2.0, because it provides Turing complete virtual machine that can run smart contracts, bringing unlimited possibilities

and EOS is called blockchain 3.0, why? Two words: performance

The positioning of EOS is the slogan of its home page:

English: the most powerful infrastructure for decentralized applications

Chinese: the most powerful decentralized application infrastructure

EOS expects to be an enhanced version of Ethereum, a high-throughput intelligent contract platform

although Ethereum has complete functions, it is limited by its design choice. Due to the block output speed of 15 seconds, the transaction throughput is far from large-scale practical level, which is only about 30 ~ 40tps (transaction / s). EOS, on the other hand, has chosen a different technology route, with the goal of achieving a considerable million TPS, which is quite attractive considering visa's actual processing speed of 1700tps

consensus mechanism of EOS

the reason why the throughput of bitcoin and Ethereum is so low is that they are constrained by the application scenario they envision and the consensus mechanism they choose for the scenario - both of them assume that the environment in which the system runs is totally untrustworthy, so they both adopt the consensus mechanism of proof of work

consensus, as the name suggests, is to reach a unified understanding of something - for blockchain, something refers to the confirmation of the transaction - any node to submit a transaction needs everyone's approval

the pow mechanism currently adopted by bitcoin and Ethereum is the design of the legendary Nakamoto Tsung. Under this mechanism, in order to obtain the bookkeeping right and digital currency reward, miners need to constantly dig for the compliant hash value, and confirm and package the transaction data through the consensus of hash value. POW has no access threshold, and any node has equal rights to participate in bookkeeping. Of course, the probability of winning is related to computing power:

the price of ram is based on Bancor algorithm, that is, it is regulated by market supply and demand: if the supply of ram exceeds the demand, more EOS certificates are needed to buy ram, At this time, more EOS certificates can be obtained by selling ram

memory is a consuming resource, which cannot be redeemed and can only be bought and sold. Take the issue of currency on EOS as an example. At present, the issue of currency requires 20m of memory. An EOS can buy 20KB. According to the current storage price, issuing a currency will consume 1000 EOS. This is the source of EOS memory consumption

Course Overview

this course is for friends who are interested in the development of EOS decentralized application. The course covers the core concepts of EOS DAPP development, the development and deployment of smart contracts, and how the front page interacts with EOS blockchain. Finally, a complete DAPP development based on react and EOS is completed

Chapter 1: enter the world of EOS

to understand the core concepts of EOS, such as positioning and characteristics, consensus mechanism, payment computing model, etc

Chapter 2: Hi EOS

understand the overall framework of EOS node software and the functions of node server, wallet server and command-line tools, learn how to configure and start EOS node server and wallet server, and preliminarily understand the use of command-line tools

Chapter 3: wallet, key and account

understand the three core concepts related to personal identity in EOS: wallet, key and account, and learn how to use command-line tools to create wallet, key and account

Chapter 4: development and interaction of smart contracts

understand the concept and function of smart contracts, learn how to write and compile EOS smart contracts, and learn how to deploy and interact with contracts using command-line tools

understand the persistence mechanism of state in EOS smart contract, and learn to use multi index table to save contract state

Chapter 5: issue your own tokens

learn the principle and implementation mechanism of issuing tokens on EOS, and master how to use command-line tools to issue, transfer and view the balance of tokens through practical operation

Chapter 6: use code to interact with smart contract

understand the principle of interaction between application and EOS blockchain, and learn to use JSON RPC interface and eosjs encapsulation library to access EOS blockchain

Chapter 7: DAPP development of practical notes

comprehensively use EOS knowledge, use react to complete a decentralized application of EOS notes, and learn the complete process from requirement analysis to code implementation

The above course address is as follows: EOS tutorial

3. EOS Digital currency, also known as grapefruit coin. In Chinese currency, I hold this currency. When I don't use it, I can save money, mine and earn money
as for reliable and unreliable, it's totally self-conscious. Equivalent to investment, you can bear the risk.

4. EOS Digital currency online main network, but just online when there are many small problems

5. It's a virtual currency with great risk and high return. It's not a pyramid scheme. It can be traded on some platforms. Be careful,

6. Before the birth of bitcoin, global information transmission was realized through the TCP / IP (Transmission Control Protocol / Internet Interconnection Protocol) protocol of the Internet to achieve high-speed and low-cost transmission. However, with the development of interconnection technology (Internet, Internet of things, VR / AR), the interaction between people and objects, people and information is more diversified, and more entities are digitized or token, Just the sharing and transmission of information can not meet the economic and social development, so when the entity is digitized or token, people pay more and more attention to the value transfer and how to transfer these assets and values point-to-point
after the birth of bitcoin, it is proposed to realize value transfer through decentralized bitcoin network. In the bitcoin system, all participants in the whole network are the supervisors of the transaction, and both parties can complete the transaction without establishing a trust relationship. Blockchain technology has changed the way people access and share information, creating a new distributed, point-to-point ecological society
at present, blockchain technology is mainly divided into three times in the market:
&&# 160; The first era is a point-to-point e-cash system represented by BTC< br />Ø&# 160; The second era is the open smart contract complete solution represented by eth< br />Ø&# 160; The third era is to solve the problem of eth performance shortage and block congestion, and strive to achieve better commercial value of public chain cluster
the global ecological cycle Foundation (hereinafter referred to as the foundation) was registered in the United States in 2020. Through the integration of ecological technology and information technology, the foundation is committed to promoting global land greening, maintaining ecological balance, and leveraging more social resources to create a sustainable green economic business model
the foundation is committed to exploring a new sustainable business model of global green economy and promoting the development of global green economy; Promote the formulation and implementation of policies and action plans of the international community in the fields of green development, ecological environment protection, desertification control and clean energy. Through the above continuous positive feedback circulation business model, the external social capital can be internalized effectively. The Foundation hopes to mobilize at least $20 billion of global funds to develop a green economy in 10 years
the project will focus on the use of innovative technologies and financial tools, including but not limited to green assets, blockchain (standard tools), professional review institutions (AUDIT), and cooperate with project stakeholders including enterprises, governments, audit firms, certification institutions, investors and so on, to jointly promote the development of landing projects< br />  Basic Proct   Chain (BPC) endows the green instry with the concept of "consumers are shareholders", so that more users can get green rewards by using green ecological procts. It can be predicted that after the crazy speculation in the first decade of blockchain, the next decade will lead to a golden period of value investment. Under the POC consensus mechanism, relying on capacity proof (hard disk) and digital assets as the means of circulation, it will eventually return to the real world and promote the development of the real economy through scenario application, It will play an important role. In short, as long as we prove the relevance of all the related rewards generated by the network through the capacity, the data will be linked, real, open, transparent and searchable; The idea of everyone mining and one person, one vote will appear in a more green, low-cost and complete form
I hope it will help you

7.

Many places in China are experimenting with the use of digital RMB, and the convenience of digital RMB is as follows:

First: Digital RMB can be used offline

although mobile payment is very common now, any third-party payment software needs to be connected to the Internet. Alipay and WeChat also monopolize the third party payment market, but once these two software are not connected, they will not be able to complete the payment. Although it's all right to go out with your mobile phone now, you don't need to bring your wallet and cash, but all this is based on the fact that your mobile phone has electricity and network

The consumption habit of

is unhealthy, so digital RMB is actually a more real and planned payment method, which is helpful for young people to develop good consumption habits. This can avoid over consumption and other bad habits

8. Do EOS system source system, good company price must be a little more expensive, Shengshi Huacai company is good.

9. 1. Add the jar Library under dist directory in the SDK to your Java project, and add it to your compilation path. 2. Import the corresponding package name in your code. 3. For non web applications, please modify and consult maindemo. Java, for web applications, please modify config. JSP, and consult index. JSP to obtain the method interface including OAuth login request and other function request

10. I don't know what you want to ask specifically. If you want to set query conditions, you can set criteriaentity in the assignment. First set the persistent entity object corresponding to the query entity, and then set query conditions. For example, add three lines to the assignment, criteriaentity / expr on the left of the first line/_ Property, set sex (constant) on the right of the first line