How long has block global public chain been open

1. We can only talk about domestic examples. High quality application platforms such as the blockchain rental platform in xiong'an New District of Hebei, the blockchain government affairs platform in Chongqing, and the SMIC blockchain public service platform in Changsha of Hunan are the first to lead into the era of blockchain 3.0.

2.

Blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum

blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies

blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

extended data

according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:

1. The blockchain with the whole network open and without user authorization mechanism is called public chain

2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain

3. All the nodes in the network are in the hands of one organization, which is called private chain

alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain

blockchain features

1, decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain

2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent

3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention

4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes

5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously

3.

Public chain, also known as "public chain", refers to the blockchain that anyone in the world can enter the system at any time to read data, send confirmatory transactions and compete for bookkeeping. The public chain is generally considered to be "completely decentralized", because no indivial or institution can control or tamper with the reading and writing of data in it. In terms of application, blockchain public chain mainly includes bitcoin, Ethereum, super ledger, most counterfeit currencies and smart contracts. The ancestor of blockchain public chain is bitcoin blockchain, which has the following characteristics:

1, open source code

upload the code to GitHub, and everyone can get complete blockchain data by downloading, Accept the test of the public

2, complete decentralization

anyone can become a node, each node is open, everyone can participate in the calculation of the blockchain, any node is not permanent, but phased, and any center is not mandatory for nodes. Anyone can read and send transactions, and transactions can be effectively confirmed on the blockchain. Anyone can participate in the consensus process. The consensus process determines whether a block can be added to the blockchain and the exact current state. Everyone can get financial reward from it, which is proportional to their contribution to the consensus process. These public chains are generally considered to be "completely decentralized"

3. Developing decentralized applications

through this public chain, developers can easily develop centralized applications. Public chain can protect the rights and interests of users from the influence of program developers

4.

Blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. Blockchain is an important concept of bitcoin. It is essentially a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of information about bitcoin network transactions, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

if such technology wants to be put into application, the biggest problem is the "Impossible Triangle problem"

that is, scalability, decentralization and security cannot be achieved at the same time, and only two of them can be achieved

most of the existing public chain projects in the market are difficult to put into use on a large scale

5. Before October 2018, it seems that the fastest one is REBO, next to EOS. After October, these public chains are basically silent in terms of speed, because bitconch of Baker chain has achieved 120000 TPS Based on many technical advantages, which makes it possible for applications to land. Therefore, the world's fastest public chain is the world's fastest public chain, which can be said to be the leader.

6. Network btc123, this website I often use
you can find a trading website on btc123, and then find their official QQ group on the website. If you add a QQ group, you can receive a lot of messages, but there are also many false messages. You can judge for yourself. Or search QQ group with bitcoin keyword directly on QQ
there is also a discussion area on btc-e. if you want to watch others chat there, the news will be very fast.

7. All day trading... The website has no rest

8. What is blockchain
blockchain is a new decentralized protocol, which can safely store bitcoin transactions or other data through the carrier of distributed ledger (or database), ensure that the information can not be forged or tampered through the global network, and can automatically execute intelligent contracts without the audit of any centralized organization. Transactions can be digital currencies such as bitcoin, or digital assets such as equity and intellectual property rights. It greatly reces the trust and accounting cost of economic operation

blockchain has two core concepts: transaction / transaction and block

what is transaction / transaction
blockchain is a global shared and transactional database. Everyone in this network can read the records. If you want to modify something in this database, you must create a transaction and get confirmation from everyone else. A transaction means that you have to make a change that is either fully executed or not executed at all. When your transaction is applied to this database, other transactions cannot modify the database

for example, imagine a table that lists the balance of all bitcoin accounts. When a transfer request from account a to account B occurs, the transaction feature of this database ensures that the amount dected from account a will be added to account B. If for some reason, it is impossible to increase the amount to account B, then the amount of account a will not change

in addition, a transaction is cryptographically signed by the sender (the creator of the transaction). This measure increases access protection for database modification. In the above bitcoin example, it can be ensured that only the person holding the account a key can transfer money from the account

what is a block
one of the main problems to be solved by blockchain is called "double flower attack" in bitcoin. What happens when there are two transactions on the Internet and the balance has to be transferred from one account? A conflict

the simple answer is that you don't need to care about this. These transactions are sorted and packaged into "chunks" and then executed and distributed by all participating nodes. If two transactions conflict with each other, the lower ranked transaction will be rejected and removed from the block

these blocks are arranged in a linear sequence according to time. This is the origin of the word "blockchain". Blocks are added to the chain at regular intervals. For bitcoin, the interval is about 10 minutes. For Ethereum, the interval is about 17 seconds. Ethereum has made improvements compared with the special currency. It is believed that it can achieve near real-time transfer in the future, which can be applied to the business field with high real-time requirements

as part of the "sequential selection mechanism" (commonly referred to as "mining"), a block chain may be rolled back from time to time. But this only happens at the end of the chain. The more blocks involved in rollback, the lower the probability of its occurrence. So your transaction may be rolled back or even removed from the blockchain. But the longer you wait, the less likely that will happen<

future prospects
after understanding some basic principles of blockchain, you may have found its value. The traditional Internet has completed the transmission of information globalization, but it can not transfer trust and value. The characteristics of blockchain can transfer trust and value. It is believed that blockchain will lead the evolution of information internet to value Internet. In the next 10 years, human society will enter a more open and transparent world

Introction to Bubi blockchain

Bubi blockchain is a commercial blockchain. Bubi covers seven areas: exchange, points (multiple points, gege points), insurance (sunshine insurance will launch accident insurance on our blockchain in a month, which can greatly rece channel costs), equity crowdfunding (gold stock chain, etc.), supply chain finance (Qian Xiang, etc.), supply chain (cooperation with the material chain, etc.), jewelry anti-counterfeiting, etc. Some funds cooperating with Bubby have committed 150 million investment funds. Bubby plays the role of "LP" in the fund, helping the fund identify and invest in companies related to blockchain. At present, the average amount of angel investment obtained through Bubi blockchain is about 3 million, with an average valuation of more than 40 million

Finance is essentially a money relationship between people

but if it is a direct money relationship between people, it is only a relationship of borrowing and transferring, which does not constitute a real sense of finance

the emergence of third-party institutions makes the money relationship between people become a financial relationship

why can the third party institutions realize the function of finance

this is because the third-party financial institutions have solved the following three problems:

trust
settlement
rules

these three problems are exactly the problems that blockchain can naturally solve

the so-called blockchain is to jointly maintain the public ledger on multiple nodes

the data of large ledger will be packaged once in each specified time period, and the packaged data is called block. Connecting the packed blocks in a specific way in chronological order is called blockchain

blockchain data is broadcast to all nodes on the Internet, forming data information that can not be tampered with but can be verified

thanks to the blockchain technology, as a bitcoin user, he can completely trust Zhang San to transfer a bitcoin to Li Si's address after querying through the block. This event is true. Li Si has 100 bitcoins in his wallet, which can be confirmed by signature

based on reliable payment and real property, the problem of trust has a foundation to solve

and a higher degree of trust can be achieved through multi signature

what is multi signature? It is very simple, that is, a payment has more than one related person. When the number of related persons reaches the set confirmation, the payment will take effect

through the above parts, the trust problem can be well solved

blockchain Internet is the two areas of interaction. Today's Internet seems to transmit information perfectly, which is not limited by time and region, and is cheap, simple and fast. However, things are always moving forward. When we solve the problem of Internet massive data processing through database, cloud storage and other technologies, what follows is how to solve the authenticity and effectiveness of data on a large scale. Blockchain technology emerged with the trend. It is the first time to establish decentralized trust technology from the technical level, which is of subversive significance.

9. In fact, many countries around the world are vigorously supporting the development of blockchain technology, including China. Since last year's speech, the development of China, especially blockchain + government affairs, has been particularly rapid. I believe that through the development of blockchain + government affairs to promote the popularity of blockchain, all kinds of fields are linked with blockchain and have practical application landing. At the same time, when there are practical social benefits, it means that the world has entered the era of blockchain 3.0. Many blockchain + government applications in China, such as Changsha's SMIC blockchain public service platform, are actually the first blockchain 3.0 era to lead Changsha into. I believe there will be better and wider promotion in the future.

10. Man, sign up for the postgraate entrance examination today ~ if you want to answer quickly, you need to give points when you ask questions ~ ha ha ~ there's only No.7 bus to get there ~ you can go from No.4 bus of Taishan University to xiaheqiao ~ No.4 bus route, you know for sure ~ No.7 bus route: Taigong group
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South section of Yingsheng road
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hemp
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Cancer Hospital Qingshan shoe city
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Taishan Wenzhou commercial pedestrian street
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old bus station (east entrance of Wenzhou pedestrian street)
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railway station
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financial resources
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Honglou department store Xiaheqiao
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Taishan theater
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military area
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red arrow clothing
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Taiqian Chengxin
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Fuyuan Hotel
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kangpingna
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Dongyue middle school (municipal construction staff training center)
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civil affairs building
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loader factory
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Huaxin community, orthopedic hospital Aijia supermarket
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caiyuanxiang
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Lann Motorcycle City
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Tai'an No.19 middle school
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Fashion College