What is j-coin blockchain technology

1.

From the perspective of technology and architecture, I will tell you my understanding of blockchain in common language

what is blockchain? In a word, blockchain is a storage system. To be more specific, blockchain is a distributed storage system without an administrator and each node has all the data

What are the common storage systems like

first, how to ensure high availability

the common storage system usually uses "rendancy" to solve the problem of high availability. As shown in the figure above, if the data can be copied into several copies and rendant to multiple places, high availability can be guaranteed. The data in one place is hung, and there is data in other places. For example, the master-slave cluster of MySQL is the same principle, and the raid of disk is also the same principle

two points need to be emphasized in this place are: data rendancy often leads to consistency problems

1. For example, in the master-slave cluster of MySQL, there is actually a delay in reading and writing, which means there is a inconsistency in reading and writing in a short period of time. This is a side effect of data rendancy

The second point is that data rendancy often reces the efficiency of writing, because data synchronization also consumes resources. If you add two slave libraries, the write efficiency will be affected. The common storage system is to use rendancy to ensure the high availability of data

so the second question, ordinary storage system, can write more

the answer is yes, for example, take this graph as an example:

in fact, MySQL can do a master-slave synchronization of al masters, master-slave synchronization of al masters, two nodes can be written at the same time. If you want to do a multi room multi live data center, in fact, multi room multi live data synchronization. What we should emphasize here is that multi-point writing often leads to the consistency problem of writing conflicts. Take MySQL as an example, suppose that the attribute of a table is self incrementing ID, then the data in the database is 1234 now. If one of the nodes writes and inserts a piece of data, it may become 5, and then these 5 pieces of data are synchronized to another master node, Before synchronization, if another write node inserts a piece of data, a piece of data with self incrementing ID of 5 will be generated. Then, after the generation, synchronize to another node, and the synchronized data will conflict with the two local 5's after it arrives, which will lead to synchronization failure and write consistency conflict. This problem will occur in the case of multi-point writing

how to ensure consistency in multi-point writing

the reform "Swan class" gives you more technical work

2. bitcoin is a kind of digital currency based on blockchain technology
blockchain technology is a kind of e-money ledger system realized through point-to-point

3. Who can say, how about mining? Mining refers to the use of bitcoin mining machine to obtain bitcoin, that is, the computer used to earn bitcoin. If you can get bitcoin, you can make money. This kind of computer generally has professional mining chips, and works by installing a large number of graphics cards, which consumes a lot of power. The computer downloads the mining software and then runs a specific algorithm to get the corresponding bitcoin after communicating with the remote server< First, the principle of Mining:
1. As long as there is a computer that can access the Internet and download the bitcoin program from the bitcoin website, the first run will generate a digital account, and then keep running, the program will continuously calculate a series of "mathematical problems". When you have successfully calculated "a mathematical problem", the, It's possible to get a certain amount of bitcoin
2. Bitcoin is a P2P network. To keep the network running, it is necessary to keep someone uploading and sharing data to others online. Bitcoin network needs someone to contribute computer resources for computing to ensure the operation of bitcoin network. Therefore, bitcoin is designed that whoever contributes computing power to keep the network running can get the fee paid by the network bitcoin< Second, mining security mechanism:
Mining creates a competition mechanism equivalent to lottery, and it is very difficult for anyone to continuously add new trading blocks to the block chain. This mechanism can prevent any indivial from obtaining the ability to freeze certain transactions, thus ensuring the neutrality of the network. This mechanism can also prevent any indivial from replacing part of the block chain to rece their own costs
precautions:
1. It's better to do DIY mining machine by yourself, from purchasing accessories to assembling, and then to mining software, to learn, focus, practice and graally understand the blockchain
2. Mining is actually a fixed investment process: regardless of the currency price, a certain amount of positions will be increased every day
3. The bitcoin wallet used to store bitcoin uses military level encryption, which makes it impossible for hackers to steal easily. Bitcoin wallet also allows users to set two passwords, a public account password and a private password. The user of public account password is to let the user receive bitcoin. If users want to withdraw or transfer bitcoin from their accounts, they need to use a private password.

4. Blockchain is an important concept of bitcoin. According to the 2014-2016 global bitcoin Development Research Report released by fire coin and Internet Finance Laboratory of Wukou School of finance of Tsinghua University and Sina Technology, blockchain is the underlying technology and infrastructure of bitcoin. In essence, it is a decentralized database, as well as the underlying technology of bitcoin. Blockchain is a series of data blocks generated by cryptography. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block
in a narrow sense, blockchain is a kind of chain data structure that combines data blocks in chronological order in a sequential way, and it can not be tampered with and forged by cryptography. In a broad sense, blockchain technology is a new distributed infrastructure and computing paradigm, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data
domestic blockchain application platforms include digital currency crowdfunding platform, asset custody system based on blockchain technology, which is jointly developed by coin Ying China, China Post and IBM.