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『一』Beida Jade Bird Java Training: The Element Architecture of Blockchain Technology

With the continuous development of the Internet, more and more people have learned about the blockchain technology Some characteristics and usage of blockchain technology. Today we will introduce some elements of blockchain in Anhui.
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.

『二』What is blockchain

Blockchain is a distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithmNew application models of computer technology such as law. Blockchain is an important concept of Bitcoin.

It is essentially a decentralized database. As the underlying technology of Bitcoin, it is a series of data blocks generated using cryptographic methods. Each data block contains a batch of The information of Bitcoin network transactions is used to verify the validity of its information (anti-counterfeiting) and generate the next block.

(2) Extended reading of Java blockchain jar package

Characteristics of blockchain:

1. Deposit certificate< /p>

The "non-tamperable" feature of blockchain provides a solution to the problem of "certificate storage" in economic and social development. As long as the authenticity of the on-chain information and data can be ensured, the blockchain can solve the problem of "storage" and "certification" of information.

For example, in the field of copyright, blockchain can be used to store electronic evidence, which can ensure that it is not tampered with, and can link original platforms, copyright bureaus, judicial agencies and other parties through distributed ledgers, which can greatly Improve the efficiency of handling infringements.

2. Sharing

The "distributed" characteristics of the blockchain can break through the "data barriers" between departments and achieve information and data sharing. Different from centralized data storage, the information on the blockchain will be distributed to each node through point-to-point broadcasting, and all information can be "truthfully recorded" through "whole network witness".

『三』Beida Jade Bird Java Training: The development trend of blockchain technology implementation

With the continuous development of blockchain technology, more and more people are beginning to pay attention to the area. How blockchain technology is implemented to achieve project conversion and development.
Today, let’s take a look at the development trends of blockchain technology implementation.
Blockchain is finding ways to form new industries and enterprise applications every day, and it won’t be long before this technology will be everywhere.
In the future, start-ups, academic institutions, open source institutions, alliances and financial institutions will all participate in this technology.
The current controversy over the prospects of blockchain focuses on the uncertainty of its implementation direction and value.
In the fog, there are different opinions. Some people say that "blockchain does not make money without ICO", while others are trying to find the true value of blockchain technology in real-life scenarios outside the currency circle.
Here are some things worth paying attention to.
Blockchain core technology refers to blockchain core technology, which generally includes key technologies in the application layer, contract layer, incentive layer, consensus layer, network layer, and data layer.
The research hotspots here include consensus, distributed ledger, cross-chain technology, P2P network and some application practices.
You may ask: There are currently many blockchain platforms on the market. How to correctly understand and evaluate the underlying technology suitable for enterprise selection? What are the key pain points and technical challenges faced by blockchain in enterprise-level applications? How to Solve? Blockchain projects related to life and medical data, there are some problems in the development and operation processWhat are the lessons learned? What is the essence of cross-chain? What problems need to be solved? What are the technical difficulties and implementation models? What are the characteristics and implementation principles of the file system? How to implement the DPoS algorithm in Ethereum and its significance? Blockchain Finance When blockchain technology was first proposed, finance was considered one of the main application scenarios, including the establishment of inter-bank point-to-point payment settlement systems and cross-border payment systems based on blockchain technology, and the use of blocks in exchanges. Chain technology realizes the registration and transfer of equity, etc.
Blockchain has inherent absolute advantages when applied to the financial field. From a subjective point of view, financial institutions have a strong willingness to explore blockchain applications and need new technologies to improve operational efficiency and reduce costs to cope with the current situation of the entire global economy. status quo.
Objectively speaking, the financial industry has a huge market space, and a little progress can bring huge benefits.
Shanxi Computer Training http://www.kmbdqn.cn/ found that the financial industry is an industry with extremely high requirements for security and stability. If the application of blockchain in the financial field can be verified, a huge demonstration will be produced The effect was quickly promoted in other industries.