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① What courses do you need to learn in blockchain?

The courses you need to learn in blockchain are:

1. Khan Academy

If you want to brush up on your Bitcoin knowledge, or learn cryptocurrency from scratch, the points are explained thoroughly and will get you going in the right direction on your blockchain journey.

You can progress through 8 separate steps, from a basic overview to explanations of cryptographic hash functions, digital signatures, proof-of-work, and blockchain security.

2. Udemy

You won’t get a Harvard education by taking a 2-hour online course. But actually, as a blockchain enthusiast, Udemy may be more useful. Depending on your skill level, there's a lot for everyone here.

For those who want to learn the basics of blockchain, there is a great course called "Blockchain and Bitcoin Fundamentals." In the course above, you get a 2-hour course, downloadable resources, and the opportunity to access the course anytime you want to complete it.

If this motivates you to continue taking classes, you will also receive a certificate. But most importantly, you will gain a solid understanding of the basic concepts of Bitcoin.

3. Lynda

LinkedIn’s Lynda offers a number of different courses across all levels.

For companies that want to provide training to several departments, this platform seems like a good choice since there are so many niche courses to choose from.

But there is a great course called Blockchain Fundamentals Course that provides a one-hour overview for beginners.

4. Coursera

Coursera's prices vary with complexity, although they do have some free options that encourage you to purchase separate supplemental course materials. Courses are created and taught by professors from universities such as Stanford, MIT, and Princeton, making them a wise choice if you're looking for great instructors.

You won’t get a Princeton credential through these courses, but you will be exposed to some of the brightest minds in academia. One course that particularly stands out is “Bitcoin and Cryptocurrency,” taught by four leading Princeton professors.

This is an 11-week program covering cryptography, Bitcoin mining, rules, mining puzzles, and even a chapter on altcoins. Additionally, this course includes detailed lectures, exercises, continued reading, and homework assignments.

5. PluralSight

PluralSight is full of new technical courses that are hands-on and concrete. For example, if you want to learn a programming language like MySQL or Javascript.

② Peking University Jade Bird Design Training: The Element Architecture of Blockchain Technology

With the continuous development of the Internet, more and more people have learned about some of the characteristics and characteristics of blockchain technology. Usage, today we will introduce some elements of the blockchain in Zhengzhou.
Composition of Blockchain Blockchain consists of blocks and chains.
Each block contains three elements: data, hash value, and the hash value of the previous block.
The first element of the block is data.
The data stored in the block is related to the type of blockchain.
For example, blocks in the Bitcoin blockchain save relevant transaction information, including sellers, buyers, and the amount of Bitcoin traded.
The second element of the block is the hash value.
Each block contains a hash value, which is used to identify a block and all the content it contains.
Once a block is created, its hash value is calculated accordingly.
Changing something in the block will cause the hash value to change.
So in other words: hashes are helpful when you want to detect changes to content in a block.
If the fingerprint of a block changes, it is no longer the same block as before.
The third element of the block is the hash of the previous block.
This element allows links to be formed between blocks and makes the blockchain very secure.
For example, suppose we have a blockchain containing 3 blocks.
Each block contains its own hash value and the hash value of the previous block.
Block No. 3 points to Block No. 2, and Block No. 2 points to Block No. 1.
But block No. 1 is a bit special, it cannot point to the previous block because it is the first block.
We call block 1 the genesis block.
So, now let's assume you tampered with the second block.
This will cause the hash value of the second block to change, so the data stored in block No. 3 will be wrong and illegal.
Once the data stored in block 3 is illegal, the following blocks must also be illegal.
So if a person wants to tamper with any block in the blockchain, it must modify this block and all blocks after this block.
This will be a heavy task.
Blockchain's Proof of Work However, the method of using hash values ​​alone is not enough to prevent users from tampering with blocks.
Because today's computer computing speed is powerful enough and can calculate thousands of hash values ​​per second.
java course http://www.kmbdqn.cn/ suggests that you can completely tamper with a block and recalculate the hash values ​​of other blocks, thus making your block legal again.

③ What training courses are available in blockchain

How many weeks does the Go full stack + blockchain course last? How many stages? Talk more at each stageLong? To what extent have you completed each stage?

A total of 22 weeks, divided into 5 stages,

The first stage is 4 weeks of Go language basics and network concurrency, after learning the introductory Go language,

The third The second phase is 4 weeks of practical web development in Go language, crawler development, cryptography, consensus algorithm, and implementation of lightweight public chain. After learning, you can develop golang websites, crawlers, and implement lightweight blockchain

The third phase is 4 weeks of Ethereum source code analysis and smart contract Dapp development. After learning and mastering the core of Ethereum and developing smart contracts, as well as blockchain,

The fourth phase is 4 weeks of Super Ledger, Bitcoin EOS, Source code analysis and smart contract practice. After completing the course, you will master Hyperledger development, Bitcoin copycats, forked EOS, and smart contract Dapp development

The fifth phase is a 6-week project practice, and you will practice 5 enterprise-level projects. After completing the course, you can have 1 year of blockchain project experience

④ What are the course introductions to the blockchain technology architecture?

The current blockchain training courses on the market span a wide range, and the course contents are as follows: The teaching formats are also varied.

Blockchain

1. Introduction to programming basics

Computer software and hardware basics, character sets and character encoding, HTML+CSS (including HTML5+CSS3), ECMA + BOM + DOM, jQuery, node.js, Ajax and Express

2. Go programming language

Go basic syntax, process control, functions and Data, error handling, Go object-oriented programming, Go concurrent programming, Go network programming, Go security programming, Go advanced programming (goroutine, channel), database MySQL, LevelDB

3, blockchain 1.0— —Bitcoin

Bitcoin principles, Bitcoin system architecture, cryptographic algorithms (implemented in Go language), consensus algorithms (implemented in Go language), Bitcoin transaction principles and transaction scripts, Bitcoin RPC programming (node .js implementation), Bitcoin source code analysis

4. Blockchain 2.0 - Ethereum

The working principle and infrastructure of Ethereum, the basic concepts of Ethereum (accounts, transactions , Gas), Ethereum wallet Mist and Metamask, Ethereum transactions, ERC20 standard Token development and deployment, Ethereum development IDE - remix-ide, smart contracts and Solidity, Solidity deployment, backup and calling, framework technology: truffle and web3, DApp development practice, Geth

5, Blockchain 3.0 - Fabric of Hyperledger

Hyperledger project introduction, Fabric deployment and use, Fabric configuration management, Fabric architecture design, Fabric CA application and configuration, application development practice.

The Xueshuo Innovation Blockchain Technology Workstation under Lianqiao Education Online is the only "blockchain technology" approved by the "Smart Learning Workshop 2020- Xueshuo Innovation Workstation" carried out by the School Planning and Construction Development Center of the Ministry of Education of China. Professional” pilot workstation. The professional base is based on providing students with diversified growth paths, promoting the reform of the training model integrating professional degree research, production, and research, and building an applied and compound talent training system.

⑤ Peking University Jade Bird Design Training: Analysis of the Relationship between Distribution and Blockchain

We have said a lot about the discussion of blockchain technology in previous articles. times, and also introduced to you which programming development languages ​​are used to realize the realization of blockchain technology. Today we will learn together how to analyze and understand the structure of blockchain from a distributed perspective.
Blockchain is derived from the underlying technology in Bitcoin and is used to implement a centerless peer-to-peer cash system. Because there is no participation of a central organization, Bitcoin organizes transaction data in the form of a blockchain to prevent "dual Flower" to reach a consensus on the transaction.
Digital assets in the traditional sense, such as game currency, are managed in a centralized manner and can only be transferred in a single system. They are coordinated by a centralized organization and are usually stored in a database.
From a macro perspective, blockchain and database are both used to save data, but the form of data access is different.
The blockchain is essentially a distributed database that is active in different places.
The proposal of multi-activity in different places was originally to solve the disaster recovery problem of the system. It has been a direction explored in the field of distributed databases for many years, but with little success, because multi-activity in different places needs to solve the problem of data conflicts. This problem is actually not easy to solve.
However, the blockchain born in Bitcoin has realized the world's largest remote multi-active database in a completely new way. It is completely open, has no boundaries, supports tens of thousands of nodes and can join and exit at random.
The problem of data conflicts is even more prominent in the blockchain. Each node in the blockchain is a completely peer-to-peer multi-active architecture. Tens of thousands of nodes must reach an agreement. Who should the data be based on? Bitcoin adopts The method is POW. Everyone calculates a puzzle. Whoever calculates it first has the right to keep accounts. In this cycle, the account he keeps shall prevail. In the next cycle, everyone will recalculate.
Nodes competing for accounting rights decide which transactions to package into blocks and synchronize the blocks to other nodes. Other nodes still need to verify the transactions in the block based on local data, unlike the master-slave of the database. Unconditional acceptance among nodes is the consensus algorithm in the blockchain.
Although POW consumes a lot of computing power, the advantage is that in the process of competing for accounting rights, POW only needs to calculate hashes in its own nodes and does not need to go through network voting for election. The cost of network communication is small, and it is suitable for consensus among large-scale nodes. .
Yueyang Computer Training http://www.kmbdqn.cn/ believes that POW is a complete, simple and crude method in the current public chain and can stand the test, but the problem is that the efficiency is too low.
So PoS and DPoS were developed later. Whoever has more assets will have the right to keep accounts, or everyone will vote. However, this also introduces economic issues, such as the so-called vote bribery issue, which is not very good. So controllable.
In traditional distributed databases, it is not called a consensus algorithm, but a consistency algorithm, which is essentially the same thing.
However, the number of nodes in a distributed database is generally very small, and the network is trustworthy. Usually the nodes are safe and reliable. We can basically trust every node, even if it fails and does not respond, but absolutely No false responses will be given.
So in traditional company distributed data, Raft or Paxos protocols are used to do this consistency algorithm.