Funny explanation of blockchain
1. Blockchain is a distributed database (system) placed in a non secure environment
2. The blockchain uses cryptography to ensure that the existing data cannot be tampered with
3, the blockchain uses consensus algorithm to reach consensus on new data
the system with the above three properties is blockchain.
blockchain is actually two words, block and chain. Every bill is a block, which is linked together to form a blockchain.
first, at the beginning of bitcoin's operation, Xiaoming was given 200 yuan, and it was stipulated that whoever recorded the account first could get 10 yuan (this is the consensus mechanism, which encourages everyone to agree to do the same thing), Then give you a lot of blank bills, once a transaction occurs, you can fight for bookkeeping
1 one day, Xiao Ming gave Li Si 100 yuan (that's the deal). Then Xiao Ming could roar in the crowd and I gave Li Si 100 yuan (and sign his name). When you hear this, you can fight for bookkeeping.
2 because Wang Wu remembers quickly, he yells in the group when he finishes it first, and I remember well. This is Wang Wu, and he sends the bill to others. Wang Wu remembers very well, and there is no mistake after confirmation (Li Si signed his name), so Wang Wu gets a reward of 10 yuan, Then everyone put the bill on the last page of their books& lt; There can be multiple transactions at a time & gt
3 Wang Wu likes the glory of the king. He always likes a hero, demacia, but it costs 25 yuan, but Wang Wu only costs 10 yuan, which is obviously not enough. Wang Wu starts to think that I can keep my own account. Anyway, I can't see anything from the account book. Soon, Wang Wu got another chance to keep accounts. Besides keeping good records of other accounts, Wang Wu added one. Wang Wu gave Tencent 25 and then announced it in the group
4 while Wang Wu was waiting for demacia, Li Si carefully looked at the bill and found that it was all his own signature, no problem. However, Li Si found that Wang Wu had only 10 yuan to pay for the bill, so he refused. Similarly, everyone refused
5 Wang Wu's plan failed at the cost of wasting a lot of energy without rewards
the above basically explains the process of regional chain,
is the above explanation clear? Do not understand the place, you go to ask, lieyun finance it
blockchain is a decentralized distributed ledger database . The advantage of this distributed ledger is that buyers and sellers can trade directly without any intermediary. Everyone has a backup, even if you lose this, it will not be affected
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extended data:
blockchain application field
1, financial field
blockchain has potential huge application value in international exchange, letter of credit, equity registration, stock exchange and other financial fields. The application of blockchain technology in the financial instry can save the third-party intermediary link and realize the point-to-point direct docking, so as to greatly rece the cost and quickly complete the transaction payment
2. The Internet of things and logistics
blockchain can also be naturally combined in the field of Internet of things and logistics. Through blockchain, we can rece logistics costs, trace the proction and delivery process of goods, and improve the efficiency of supply chain management. This field is considered as a promising application direction of blockchain
3. The data stored on the public welfare field
blockchain is highly reliable and tamperable, which is naturally suitable for social public welfare scenarios. The relevant information in the public welfare process, such as donation project, collection details, fund flow, recipient feedback, etc., can be stored on the blockchain, and can be made transparent and public, which is convenient for social supervision
4. In the field of insurance
in terms of insurance claims, insurance institutions are responsible for fund collection, investment and claims settlement, and often have higher management and operation costs. Through the application of smart contract, there is no need for the applicant to apply or the insurance company to approve. As long as the claim conditions are triggered, the automatic claim settlement of the policy can be realized
Four applications of blockchain
applications of financial instry
it can be said that blockchain technology is very suitable for the financial instry, just like our common international exchange, letter of credit, equity registration and stock exchange, blockchain technology can make great value, especially in transaction payment, Blockchain technology can achieve fast payment directly over the third party, which can greatly rece the cost
Internet of things instry
the application of blockchain technology in the Internet of things instry is also one of the fields with very good prospects, which is very simple for the logistics instry. Through blockchain technology, we can monitor and query the status of procts and goods in real time at any time, and improve the efficiency of supply chain management
the field of public service
we have to say that the field of public service is closely related to people's life, but because it involves a wide range and many other reasons, it also brings a lot of problems, so in the problem of centralization, we can use blockchain technology to achieve the desired effect
in the field of digital right
for various reasons, there are not a few cases of infringement in our society. Through the blockchain technology, we can timely own our works, upload corresponding proof materials to ensure the authenticity of our rights and interests, and confirm that our works can have corresponding records in all subsequent places
European certification
CE certification refers to the basic safety requirements of procts that do not endanger the safety of human beings, animals and goods, rather than the general quality requirements. The coordination directive only specifies the main requirements, and the general directive requirements are the tasks of the standard. Therefore, the exact meaning is: CE mark is a safety qualification mark, not a quality qualification mark. It is the core of the European directive; Main requirements & quot
"CE" mark is a kind of safety certification mark, which is regarded as the passport for manufacturers to open and enter the European market. CE stands for the unity of Europe
significance:
since the emergence of CE mark in 1995, CE mark has always symbolized the compliance of procts with EU laws no matter where they are proced in the world, and allowed the free circulation of the procts in the European economic area. CE mark is planned as a market supervision measure and has executive authority
TheCE mark indicates that the proct complies with all relevant directives of the European Commission. For example, most electronic procts must comply with low voltage directive and electromagnetic compatibility; Electronic toys are subject to additional toy safety instructions
TheCE mark does not indicate that the proct is proced by the European economic area. The manufacturer's CE mark on the proct indicates that the proct complies with all relevant requirements of the European Commission (e.g. safety, health, environmental protection, etc.) and has been verified by a third party designated organization
not all procts traded in EEA need CE mark. Only those commodities in the subordinate categories of the relevant directives need (and are recognized) CE certification. Most of the procts marked with CE mark can only be placed in the internal sales market controlled by the manufacturer, without independent proct consistency inspection according to the EU law. Anec warned consumers not to use the CE mark as a safety certification
CE mark is a self certification scheme, which means that the manufacturer or the importer is responsible for the proction process or the third-party test required, and bears criminal responsibility. From time to time, the government will carry out sampling inspection. If the procts are found to have problems, penalties can be imposed, including recycling of the procts, fines and even imprisonment
extended data:
scope of application
CPR regulations will apply to all construction procts sold and circulated in European market, such as doors and windows, wallpaper, building pigments, steel fiber, geotechnics, glass wool and other insulation materials, floor, roof materials, asphalt mixture, gypsum, concrete, cement, pipes, paving materials, sewerage equipment Doors and windows, glass, structural metal procts, fasteners, waterproof materials, structural wood
In addition to six basic performance requirements, European CPR also requires enterprises to prove the environmental sustainability of their construction proctsin addition to six basic performance requirements, the regulation also requires enterprises to prove the environmental sustainability information of their construction procts
not only that, but also on the basis of restricting the manufacturers of construction procts, the new regulations make new mandatory requirements for the links related to the circulation of construction procts, such as traders, importers and distributors, and provide a unified performance evaluation method for the construction procts entering the European Union, so as to ensure the reliability of the performance information of all construction procts by using a common technical language
the impact of EU CE certification CPR regulations on China
the new regulations mean that the restrictions on manufacturers, traders, importers and distributors will be more stringent. This has played a considerable role in further standardizing the EU market. China is a big country of building materials, and the European Union is one of the main export places of building materials. Instry insiders believe that the entry into force of this regulation will usher in new challenges to China's nearly 10 billion dollar building materials procts exported to the EU
director: Steven Spielberg
screenwriter: Zach Payne
Starring: ty Sheridan
type: plot
region: USA
Language: English
release: March 30, 2018
length: 140 minutes