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① How to develop blockchain

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The application scope of blockchain technology is still very wide, based on decentralization , trustless, collective maintenance, reliable database and other characteristics, its application in the financial industry is one step ahead.
Blockchain is the underlying technology of Bitcoin, and the application development of blockchain in digital currency is already mature.

Like the blockchain-based trading system development solution provided by Yingtang Zhongchuang, the developed software system has a high degree of security and transparency.

② How to develop a blockchain digital currency system development plan

Blockchain and digital currency can be said to be closely related, and the application of blockchain technology to the development of digital currency-related systems is also definitely.

Even though many companies have invested in blockchain research, there are still very few implementation projects of blockchain in the country, so certain distinctions must be made. At present, there are not many companies that apply blockchain technology to develop digital currency systems. For example, the digital currency system solution developed by Yingtang Zhongchuang has been used as a reference. There are many systems developed by it, you can take a look.

③ What is Ethereum? A guide to Ethereum development

What is Ethereum? A guide to Ethereum development
Many students are already eager to join the blockchain development team But I feel like I don’t know where to start. This article will be based on the Ethereum platform and introduce the obscure concepts involved in Ethereum development in a popular way, so that you can easily get started.
What is Ethereum
Ethereum is a decentralized application platform built on blockchain technology. It allows anyone to build and use decentralized applications running on blockchain technology within the platform.
For students who don’t understand this sentence, you can temporarily understand that Ethereum is Android in the blockchain. It is a development platform that allows us to write applications based on blockchain technology just like the Android Framework.
Before there was Ethereum, writing blockchain applications was like this: copy a copy of the Bitcoin code, and then change the underlying code such as encryption algorithm, consensus mechanism, network protocol, etc. (This is the case for many altcoins. A new coin will come out if you change it).
The Ethereum platform encapsulates the underlying blockchain technology, allowing blockchain application developers to develop directly based on the Ethereum platform. Developers only need to focus on the development of the application itself, thus greatly reducing the difficulty.
At present, a relatively complete development ecosystem has been formed around Ethereum: with community support, there are many development frameworks and tools to choose from.
Smart Contract
What is a Smart Contract
The program on Ethereum is called a smart contract, which is a collection of code and data (state).
Smart contracts can be understood as automatically executed on the blockchain (event-driven), contracts written in code (special transactions).
In Bitcoin Script, we have mentioned that Bitcoin transactions can be programmed, but Bitcoin Script has many restrictions and the programs that can be written are also limited, while Ethereum is more complete (in computer science terms , calling it "Turing complete"), allows us to write programs (smart contracts) that can do almost anything just like any high-level language.
Smart contracts are very suitable for application scenarios that require high trust, security and durability, such as: digital currency, digital assets, voting, insurance, financial applications, prediction markets, property ownership management, Internet of Things, peer-to-peer transactions, etc. wait.
At present, apart from digital currency, there are not many real-life applications (just like the mobile platform has just begun to come out). I believe that within 1 to 3 years, various killers will slowly appear.
Programming language: Solidity
The default programming language for smart contracts is Solidity, and the file extension ends with .sol.
Solidity is a language similar to JavaScript. It is used to develop contracts and compile them into Ethereum Virtual Machine byte code.
There is also a smart contract development language that looks like Python: Serpent, but it is recommended that you still use Solidity.
Browser-Solidity is a Solidity IDE for browsers. You can click in to have a look. We will introduce more articles about the Solidity language in the future.
Operating environment: EVM
EVM (Ethereum Virtual Machine) Ethereum Virtual Machine is the operating environment for smart contracts in Ethereum.
Solidity is to EVM just like it is to JVM, so it will be easy for everyone to understand.
The Ethereum Virtual Machine is an isolated environment, and the code running inside the EVM cannot have any contact with the outside world.
The EVM runs on the Ethereum node. When we deploy the contract to the Ethereum network, the contract can run on the Ethereum network.
Contract Compilation
The Ethereum Virtual Machine runs the bytecode form of the contract, which requires us to compile the contract before deployment. You can choose Browser-Solidity Web IDE or solc compiler.
Contract deployment
When developing applications on Ethereum, the Ethereum client (wallet) is often used. Usually when we are developing, we generally do not come into contact with the concept of client or wallet. What is it?
Ethereum client (wallet)
Ethereum client, in fact, we can understand it as a developer tool, which provides account management, mining, transfer, deployment and execution of smart contracts, etc. Function.
EVM is provided by the Ethereum client.
Geth is a typical client used when developing Ethereum and is developed based on the Go language. Geth provides an interactive command console, which contains various functions (API) of Ethereum through the command console. We will introduce the use of Geth in an article later, but here everyone has a concept.
The Geth console is similar to the console in the Chrome browser developer tools, but it runs in the terminal.
Compared to Geth, Mist is an Ethereum client with a graphical operation interface.
How to deploy
The deployment of smart contracts refers to publishing the contract bytecode to the blockchain and using a specific address to identify the contract. This address is called a contract account.
There are two types of accounts in Ethereum:
· External accounts
This type of account is controlled by a private key (controlled by a person) and is not associated with any code.
·Contract Account
This type of account is controlled by their contract code and has code associated with it.
Unlike Bitcoin’s UTXO design, Ethereum uses a simpler account concept.
Both types of accounts are the same for EVM.
The difference and relationship between external accounts and contract accounts is this: an external account can send messages to another external account or contract account by creating and signing transactions with its own private key.
Sending a message between two external accounts is the process of transferring value. But messages from the external account to the contract account activate the code of the contract account, allowing it to perform various actions (such as transferring tokens, writing to internal storage, mining a new token, performing some operations, creating a new contract, etc. wait).
Only when the external account issues instructions, the contract account will perform the corresponding operation.
Contract deployment is to deploy the compiled contract bytecode to the Ethereum blockchain in the form of sending transactions through an external account (the actual deployment is successful only after the actual miner produces the block).
Run
After the contract is deployed, when you need to call the method of this smart contract, you only need to send a message (transaction) to this contract account. After the message is triggered, the code of the smart contract will be executed in the EVM. .
Gas
Similar to cloud computing, the resources that occupy the blockchain (whether it is a simple transfer transaction or the deployment and execution of a contract) also require corresponding fees (there is no free lunch in the world, right? ).
Gas mechanism is used for billing on Ethereum. Gas can also be considered as a workload unit. The more complex the smart contract is (the number and type of calculation steps, the memory occupied, etc.), the more it requires to complete the operation. Gas.
The amount of Gas required to run the contract for any particular contract is fixed and is determined by the complexity of the contract.
And GThe as price is specified by the person running the contract when submitting a request to run the contract to determine what he is willing to pay for this transaction: Gas price (denominated in Ethereum) * Gas ​​amount.
The purpose of Gas is to limit the amount of work required to execute a transaction while paying for execution. When the EVM executes a transaction, Gas will be gradually consumed according to specific rules. No matter where it is executed, once the Gas is exhausted, an exception will be triggered. All state modifications made in the current call frame will be rolled back. If there is Gas remaining at the end of execution, these Gas will be returned to the sending account.
Without this restriction, someone would write a contract that cannot be stopped (such as an infinite loop) to block the network.
So actually (to put the previous content together), we need an external account with an Ethereum balance to initiate a transaction (ordinary transaction or deploy and run a contract). When running, the miner charges the corresponding work Quantity fee.
Ethereum Network
Some anxious students may want to ask, how can we develop smart contracts without Ethereum? You can choose the following methods:
Select the Ethereum official website test network Testnet
In the test network, we can easily obtain free Ether coins. The disadvantage is that it takes a long time to initialize the node.
Use a private chain
Create your own Ethereum private test network, often called a private chain, which we can use as a test environment to develop, debug and test smart contracts.
With the Geth mentioned above, it is easy to create your own test network. You can mine as much Ethereum as you want without having to synchronize the entire blockchain data of the official network.
Using the Developer Network (Mode)
Compared with the private chain, under the Developer Network (Mode), a developer account with a large balance will be automatically allocated for us to use.
Use simulation environment
Another way to create a test network is to use testrpc. testrpc is an Ethereum environment simulated locally using memory. It is more convenient and faster for development and debugging. And testrpc can help us create 10 test accounts with funds at startup.
When developing a contract, you can test it in testrpc and then deploy it to the Geth node.
Update: testrpc has now been integrated into the Truffle development framework and is now named Ganache CLI.
Dapp: Decentralized Application
The Ethereum community calls applications based on smart contracts decentralized applications (DecentralizedApp). If we understand the blockchain as a database that cannot be tampered with, and smart contracts as programs that deal with the database, then it is easy to understand Dapp. A Dapp is not onlyThere are smart contracts, for example, they also need to have a friendly user interface and other things.
Truffle
Truffle is a Dapp development framework. It can help us deal with a lot of trivial things, allowing us to quickly start the process of writing code - compiling - deploying - testing - packaging DApp.
Summary
Let’s summarize now. Ethereum is a platform that allows us to easily use blockchain technology to develop decentralized applications. In this application, Solidity is used to write and blockchain Interactive smart contracts, after the contract is written, we need to use the Ethereum client to deploy and run the contract with an account with balance (using the Truffle framework can better help us do these things). For the convenience of development, we can use Geth or testrpc to build a test network.
Note: In order to make it easier for everyone to understand, this article makes analogies to some concepts. Some of them are not strictly accurate. However, I also think that for beginners, it is not necessary to master every concept in detail and accurately. Learning is A gradual and in-depth process, many times we will find that after a period of time, we will have different understandings of the same thing.

④ What are the core technologies of blockchain system development-blockchain transaction system development-

Blockchain technology is an emerging technology today, but it is not This is too appropriate, because this technology was born with the emergence of Bitcoin ten years ago, but it is no problem to say that it is a very hot technology now. After 10 years of continuous updates, blockchain technology has finally seen relevant applications in the past two years, and has entered the blockchain 3.0 era. In the next 3-5 years, I believe there will be more fields that require blockchain Chain system to support. Below, the editor of blockchain system development loopodo will take you to take a look at several core technologies for blockchain system development.
1. Hash algorithm
Hash algorithm is the most commonly used algorithm in the development of blockchain systems. Hash function is also called hash function or hash function. The hash function can convert data of any length into a set of fixed-length codes through the Hash algorithm. The principle is based on a cryptographic one-way hash function. This function is easy to verify, but difficult to crack. Usually, the industry uses y =h (x) to represent it. This hash function implements operations on x to calculate a hash value y.
2. Asymmetric encryption algorithm
Asymmetric encryption algorithm is a secret key method. Asymmetric encryption algorithm requires two keys: public key and private key. . The public key and the private key are a pair. If the public key is used to encrypt data, it can only be decrypted with the corresponding private key. Because encryption and decryption use two different keys, this algorithm is called a non-pairCalled encryption algorithm
3. Consensus Mechanism
The so-called "consensus mechanism" is to complete the verification and confirmation of transactions in a very short time through the voting of special nodes; for a transaction, if the interests are not If several related nodes can reach a consensus, we can think that the entire network can also reach a consensus on this.
Today’s blockchain consensus mechanisms can be divided into four major categories: Proof of Work (PoW), Proof of Stake (PoS), Delegated Proof of Shares (DPoS) and Pool verification pool.
4. Smart Contract
A smart contract is a digital, networked version of a traditional contract. They are computer programs that run on the blockchain and can execute themselves when conditions written in the source code are met. Once a smart contract is written, it can be trusted by users and the terms of the contract will not be changed. Therefore, the contract is immutable and cannot be modified by anyone.
Developers write code for smart contracts, which are used for transactions and any exchange between two or more parties. The code will contain some conditions that trigger automatic execution of the contract. Once written, the smart contract is automatically uploaded to the network. Once the data is uploaded to all devices, users can come to agreement with the results of executing the program code.
5. Distributed Storage
Distributed storage uses the disk space on each machine in the enterprise through the network, and combines these dispersed storage resources into a virtual storage device, and the data is distributed in Every corner of the enterprise. Massive data is divided according to the degree of structure, and can be roughly divided into structured data, unstructured data, and semi-structured data.
Lupda Network Technology focuses on blockchain system development, Ethereum development, blockchain transaction system development, virtual currency platform development, currency transaction system development, and digital currency wallet system development

⑤ "Blockchain: Trading System Development Guide" txt download online to read the full text, seek Baidu network disk cloud resources

"Blockchain: Trading System Development Guide" (Wu Yuanwen) e-book network disk download free online Reading

Link: https://pan..com/s/1mRuKbabN9Rq_zISoZxH5hw

Book title: Blockchain: Trading System Development Guide

Author: Wu Yuanwen

Publisher: Electronic Industry Press

Publication year: 2018-10

Number of pages: 308< /p>

Content introduction:

"Blockchain: Trading System Development Guide" uses easy-to-understand language and introduces in detail the functional architecture of a blockchain trading system from a technical perspective. and working principles, allowing people to easily embrace blockchain technology with open arms and enjoy the surprise and sense of accomplishment brought by the blockchain transaction system.

About the author:

Wu Yuanwen•

Chairman of Beijing Hongchangtong Technology Co., Ltd., deputy secretary-general of the Zhongguancun Big Data Industry Alliance, vice-president of the Blockchain Finance Association, expert in the field of domestic big data and industrial Internet development, expert in the field of blockchain and big data, "District" The main author of "Blockchain World" and "Blockchain and Big Data".

⑥ "Blockchain Project Development Guide" pdf download and read online, seek Baidu network disk cloud resources

"Blockchain Project Development Guide" ( Narayan Prusty) e-book network disk download free online reading

Resource link:

Link: https://pan..com/s /16X1h2dUsvOqdsNfJA9f0jQ Extraction code: qcqe

Book title: Blockchain Project Development Guide

Author: Narayan Prusty

Translator: Zhu Xuantong

Douban score: 5.7

Publisher: Machinery Industry Press

Publication year: 2017-12-8

Number of pages: 198

Introduction:

Blockchain is one of the most disruptive emerging information technologies in the past decade. It is establishing human transactions in a completely new way. Trust, moderation, and documentation of the process. This book has 9 chapters in total. It first introduces basic concepts such as decentralized applications and DApps, and then proceeds to explain popular DApps such as Bitcoin, Ethereum, and Hyperledger. Secondly, based on the analysis of the working principle of Ethereum, the writing method of smart contracts is introduced, and the application method of web3.js is introduced. Then use the above knowledge to create specific applications such as wallet services, smart contract deployment platforms, betting apps, enterprise-level smart contracts, and alliance blockchains.

About the author:

Author: (India) Narayan Prusti Translator: Zhu Xuantong Translator: Yan Ying Translator: Dong Ning

Narayan Prusti, who created an MP3 search engine at the age of 18, is a multi-tasking developer, focusing on blockchain and JavaScript, tending to use Ethereum, Bitcoin, Super Classification, IPFS, etc. to build decentralized applications. The scalable applications he writes are widely used in startups, enterprises and government departments in India, Singapore, the United States and other countries. Narayan Prusty currently works for the Emirates National Bank’s blockchain enterprise in Dubai. He is the author of "Learning ECMAScript 6" and "Modern JavaScript Applications". Zhu Xuantong holds a master's degree from Tsinghua University and is a doctoral candidate at the Institute of Quantitative and Technical Economics of the Chinese Academy of Social Sciences, focusing on technical economics and management research. Has extensive working experience in government and international organizations. Yan Ying, Ph.D., Fudan University, Microsoft AsiaResearcher in charge of the Asia Research Institute and head of Coco Blockchain China, he focuses on research on blockchain technology, big data analysis, databases and cloud computing. Dong Ning is the CEO of ChainNova, the director of the Financial Technology Research Center of the New Generation Information Technology Institute of Peking University, the former head of IT economics for IBM Greater China, and the founder of the IBM blockchain community.

⑦ Blockchain digital currency exchange platform construction solution

Digital cash exchanges are the focus of competition in the financial field. Having a good digital currency Exchanges have great advantages in peer competition. The market of digital cash exchanges is a global market, involving global trading business hosting platforms. Digital cash exchanges have different customization needs due to different data and different functions. It is also different. A good digital cash exchange platform has rich functions, safe and powerful performance, and is differentiated among similar products. Blockchain digital asset exchange technology development

The unique interface of digital cash exchanges can provide Provide customers with convenient fund transfer methods, such as fast recharge, currency withdrawal, currency recharge, etc. It can also support multiple transaction methods, currency transactions, legal currency transactions, over-the-counter transactions, etc.

1 .Off-site exchanges: Off-site exchanges are also called OTC trading markets. This is a place with no fixed place, no fixed rules and regulations, and no prescribed trading products. Users can achieve two-way transactions on off-site exchanges, and transactions are very free, unlike other blockchains. The applications are the same, and there is no unified trading system and mechanism for remote exchanges

2. Currency trading: Currency trading, as the name suggests, is a transaction between digital currency and digital currency, using currency as the evaluation unit to purchase other Currency, intermediary in order of price priority and time priority.

3. French currency trading: French currency trading can be said to be the most direct way. What is the target price of the digital cash platform? The direct purchase transaction by users with fiat currency is a French currency exchange. The disadvantage of French currency exchange is that the currencies that can be purchased are limited. For encrypted currency types, it is necessary to purchase other types of currencies and exchange them through currency transactions.

Since the digital asset exchange is targeting the global market, its language richness is very important. The digital asset exchange not only supports the development of multiple currencies, but also supports the customized development of multiple functional modules, and also supports the development of languages ​​in various countries.

The functions of the blockchain digital asset exchange will not stop here. With the upgrade of technology in the future, new and better functions will also appear. Similarly, functional requirements also promote technology upgrades.