What is the milestone of blockchain development
in the Internet era, there is a database behind every system. This database can be regarded as a large account book. In the past, the person who maintained the system was responsible for managing the database and recording the user's behavior, that is, bookkeeping. However, the blockchain is "decentralized", which allows every member of the system to participate in it, not only everyone bookkeeping, but also through links, Everyone can have a complete account book
"blockchain is essentially a collective recording mode. What's special is that it adopts a set of techniques in an ingenious way to realize the authenticity and credibility of the recorded results, which is difficult to destroy and tamper with. " Zhang Xiaorong said, "first, everyone has the right to record and authenticate with each other to distinguish the true from the false, which is called consensus mechanism; Second, no one can tamper with the records, because there are cryptographic signatures; Third, everyone has a , so even if some account books are damaged, the whole will not be affected. This is called distributed storage. The information recorded in this way is presented in block mode according to the time chain, so it is called blockchain. "
various cryptocurrencies represented by bitcoin are originally an application of blockchain technology, which can be described as blockchain version 1.0. However, around 2014, the instry began to realize the important value of blockchain technology. Blockchain graally separated from digital currency and applied to various economic and social fields other than digital currency
it has broad application prospects
blockchain technology is considered as a disruptive innovation after steam engine, electric power and Internet. If the steam engine and electricity liberate the proctivity, and the Internet has changed the way of information transmission, the blockchain, as a machine for building trust, may change the way of value transmission
for example, in the financial field, the cost of reconciliation, clearing and settlement between financial institutions, especially cross-border financial institutions, has always been very high, and there are complex manual processes. The application of blockchain technology can help rece the cost of reconciliation and dispute resolution between financial institutions, and significantly improve the processing speed and efficiency of payment business, It also makes small cross-border payments possible. In December 2017, China Merchants Bank completed the RMB position transfer business from Hongkong Wing Lung Bank to Shenzhen Branch of Wing Lung Bank. This is the world's first interbank cross-border RMB clearing business based on blockchain technology
in addition, according to the white paper 2016 on China's blockchain technology and application development issued by the Ministry of instry and information technology of China, the application of blockchain has been extended to medical and health, ecation, charity, social management and other fields. Taking the cultural instry as an example, the low cost of reproction, the high cost of safeguarding rights, and the difficulty of providing evidence make the protection of intellectual property rights a pain point for the instry. With blockchain, the proction, dissemination and transaction records of cultural procts are true, transparent and reliable, and the problem can be solved
Zhang Xiaorong said that blockchain technology has solved two major problems in the era of Digital Economy: one is the visible flow direction, and the other is zero trust cost. In the past, the circulation of physical paper money was invisible, but the flow of all digital assets had a "chain" to check. Yang Yanchao, a researcher at the intellectual property center of the Chinese Academy of Social Sciences, also believes that the biggest advantage of blockchain is that it has truly completed the credit construction in an anonymous society, bringing new opportunities to many fields, thus making various innovative applications possible
there is a long way to go in the future development
in terms of technology promotion, there is no big barrier to blockchain, which has been confirmed in the global practice of bitcoin, and its main resistance comes from the obstacles in concept and implementation
"on the one hand, the society may be very concerned about the" naked "state in the blockchain. Blockchain has built a "Skynet" for the commercial society. The company's economic activities are all recorded, so there is no secret to speak of. In this way, some business strategies may not be implemented under the blockchain. "
"on the other hand, the current legal system lags behind the development of information technology, so how to put the emerging blockchain technology under the legal supervision needs to be studied." Duan Yongchao said
the core of blockchain is decentralization, which will have an impact on the long-standing central management model. In addition to the law, how to establish a regulatory environment that can promote the application of blockchain technology, so that the technology can benefit the society and not be used to do evil, is also an urgent problem to be solved.
blockchain is an important concept of bitcoin, which is essentially a decentralized database and 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
let's talk about the social or economic significance of blockchain. In fact, many of the previous technologies were devoted to "proctivity". For example, artificial intelligence is a kind of progress in proctivity. The blockchain, which has greatly improved the proction relations, is committed to the proction relations. So why do you say that
because the so-called proction relationship is actually how to do business between people and business partners. And these things, originally, are in the cognitive process between people, and there is no special program to program or quantify it
for example, if you and I are good friends now, we can do business. If someone stirs up our relationship and we are not good friends, we will not do business. Even if we can make money in business, we will not do business because there is no trust between us
as for blockchain, it is actually because the data is authenticated by all nodes and backed up at the same time, so my data is as real as possible and can't be tampered with. In this case, if you believe my data, you can make a program on this basis, and then use the data to make what kind of business contract, what kind of service, what kind of service, and what kind of service, what kind of service, what kind of service, what kind of service, what kind of service, what kind of service, what kind of service, etc This "proction relationship" of commercial cooperation is programmed. In this way, we believe in the data and the program compiled by the algorithm. Because you believe in the data and the program, you can develop all kinds of apps in the program. These apps are the proction relations and what business to do. This is: blockchain is actually a reconstruction of "proction relationship".
From District TV network Share: in 2018, blocklink bar AI has become the most popular technical term, and more and more technology companies have announced to enter the blockchain market. In the Internet, Xunlei, Renren, Fengfeng, Tianya and other companies have blockchain related actions. These companies share the same fate. They have all experienced prosperity, but after the impact of Internet entrepreneurship tide, they began to go downhill. Then they rubbed against the hot spots of blockchain and began to try to counter attack
Global blockchain instry investment is hot
according to the data of the "in-depth analysis report on business model innovation and investment opportunities of blockchain instry" released by prospective instry research institute, as of the end of April 2017, there were 455 blockchain companies in the world, with a total financing amount of US $1.947 billion. Among them, the total investment and financing of us blockchain related companies reached US $1.252 billion, accounting for 64.3% of the global market; The total financing amount of China's blockchain emerging enterprises is about US $114 million, accounting for 5.86%, ranking second in the world after the United States, and growing rapidly
at present, the overall survival status of blockchain is good, with a survival rate of 87.25%. Among all the invested companies, 47 have been closed, accounting for about 10.51%, and the other 10 have been acquired. Due to the change of competition pattern in bitcoin market, some companies have been forced to shut down. Meanwhile, some coin circle companies are graally transforming to chain circle companies.
exploration at the national level has also begun. On March 23, the information technology and Software Services Department of the Ministry of instry and information technology announced that it will study and explore the application of blockchain in the instrial field. Previously, the Ministry of instry and information technology said that it was preparing to establish a National Technical Committee for standardization of blockchain and distributed accounting technology to explore the formation of a complete blockchain standard system to better serve the development of blockchain technology instry
Smart contract
smart contract is based on these trusted and tamperable data, which can automatically execute some pre-defined rules and terms, allowing trusted transactions without a third party, and these transactions are traceable and irreversible. The concept of smart contract was first proposed by Nick Szabo in 1995. The purpose of smart contract is to provide a better security method than traditional contract and rece other transaction costs related to the contract
The digital form of 
extended data
means that the contract has to be written into computer-readable code. This is necessary, because as long as the participants reach an agreement, the rights and obligations of smart contract establishment are executed by a computer or computer network
to further explain:
(1) when the parties to the agreement
smart contract reach the agreement, the answer depends on the implementation of the specific smart contract. Generally speaking, the contract is discovered when the parties are committed to the execution of the contract by installing the contract on the contract host platform
(2) the real meaning of "execution" also depends on implementation. Generally speaking, implementation means active implementation through technical means(3) computer readable code
in addition, the specific "digital form" required by the contract is very dependent on the agreement that the parties agree to use