Blockchain identity authentication

1.

If you want to understand the application of blockchain, you can refer to many books and opinions, such as illustrated blockchain, blockchain: reshaping the economy and the world, blueprint and guide of new economy, and articles of coin'an community, including a detailed understanding of the platform of coin'an community, with great strength

As the name suggests, blockchain is composed of block and chain. It is a new application mode of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and so on. It is a kind of chain data structure that combines data blocks in order according to the time sequence, and it is a secure and reliable distributed account book that can not be tampered with and forged by means of cryptography

in 2008, in his paper bitcoin: a peer-to-peer e-cash system published by Nakamoto, he first proposed the idea of blockchain and encrypted digital currency. Starting from bitcoin, blockchain has become the underlying technology of various digital currencies

Second, the working principle of blockchain:

1. The basic concepts include: (1) transaction: one operation will change the account status once, such as adding a record 2) Block: records the transaction and status data within a specified time, which is a consensus and preservation of the current account status 3) Chain: it is composed of a series of blocks in chronological order, which is the log record of the whole state change. If you understand the working concept of blockchain, it is not difficult to understand its working principle. Suppose there is a distributed data logbook, which can only be added, not deleted or changed. Its structure is a linear chain formed by a series of "blocks" (which is also the source of the name of "blockchain"), and new data must be put into a new block to be added, The maintenance node can propose a new block, but it must go through a certain consensus mechanism to reach an agreement on the final selected block

2. Take bitcoin as an example to see the working principle of blockchain

the block of bitcoin is divided into block head and block body

Core advantages and characteristics of blockchain

1. The verification, accounting, storage, maintenance and transmission of decentralized blockchain data are all based on distributed system structure. There is no centralized hardware or management organization, and the rights and obligations of any node are equal, The data blocks in the system are jointly maintained by the nodes with maintenance function in the whole system. 2. The open and transparent system is open. In addition to the private information of all parties to the transaction is encrypted, the data of the blockchain is open to all. Anyone can query the blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent. 3. Security blockchain uses consensus based specifications and Protocols (such as a set of open and transparent algorithms) to enable all nodes in the whole system to exchange data freely and safely in a de trusted environment, so that the trust in "people" is changed into the trust in machines, and any human intervention does not work. 4. Information cannot be tampered with. Once the information is verified and added to the blockchain, it will be stored permanently. Unless more than 51% (almost impossible) nodes in the system can be controlled at the same time, the modification of the database on a single node is invalid. Therefore, the data stability and reliability of the blockchain are extremely high. 5. Anonymity because the exchange between nodes follows a fixed algorithm, and its data interaction does not need trust (the program rules in the blockchain will judge whether the activity is effective or not). Therefore, the counterparties do not need to let the counterparties generate their own trust by disclosing their identities, which is very helpful for credit accumulation

At present, the most popular classification of blockchain is to divide blockchain into public blockchain, private blockchain and consortium blockchain according to different participants

1. Public chain: anyone can participate in the use and maintenance, and can obtain the effective confirmation of the blockchain. Public chain is the earliest blockchain and the most widely used blockchain at present, such as bitcoin blockchain. The information is completely public

if the licensing mechanism is introced, it includes private chain and alliance chain. 2. Private chain: a company or indivial only uses the blockchain technology, enjoys the exclusive write permission of the blockchain, and does not disclose the information. At present, conservative giants (traditional finance) want to experiment with private blockchain, and the application procts of private blockchain are still groping. 3. Alliance chain: it is a blockchain between the public chain and the existing chain, which is jointly controlled by multiple organizations. The use of the chain is managed with authority, which can be controlled by the manager, and also open to others according to the manager's wishes. In addition, according to the different use scenarios and purposes of blockchain, it can be divided into currency chain for the purpose of digital currency, property chain for the purpose of recording property rights, and crowdfunding chain for the purpose of crowdfunding

On May 28, Ma Huateng, CEO of Tencent, proposed the anti-counterfeiting method based on cloud integrated blockchain technology, which is far more efficient than traditional anti-counterfeiting methods. The future anti-counterfeiting verification scenario may only require users to use their mobile phones for simple scanning, and a large number of complete information based on different dimensions can be obtained

take Maotai liquor as an example:

distillery address, proction workshop, operation staff, inspector, delivery time, transportation vehicle information and driver information,

liquor year, raw material source, raw material supplier, storage warehouse number, raw material transportation vehicle and driver information,

all information can be accurately traced, permanently recorded and tampered with

the above information can be easily verified

2. Food safety issues as early as last November, Wal Mart has cooperated with IBM to track the source of food by using blockchain technology, so as to ensure the safety of food and increase the circulation of food to rece costs. For Wal Mart and other large supermarkets, it took a few days to investigate the source of problem food, After using this technology, only one item of proct information is needed to achieve accurate traceability, and important information such as food origin, inspector, supplier, logistics and transportation can quickly find problems in a few minutes. Currently, procts tracked by blockchain include packaging procts from the United States and pork from China

3. Information security

blockchain technology is promoting an information security technology revolution. (1) identity protection PKI is a common public key encryption technology in e-mail, message application, website and other communication applications. However, since the implementation of most PKI, the centralized trusted third party certification authority (CA) is used to issue, activate and store user certificates. Hackers can attack PKI to fake user identity or crack encrypted information

certcoin is the first PKI implementation of blockchain, which comes from MIT, removes the centralized authentication center, and uses blockchain as a distributed ledger for domain name and public key

pomcor company: blockchain PKI implementation path: keep the authentication center, and use blockchain to store the hash value of issued and activated certificates. Users can verify the authenticity of certificates through decentralized and transparent sources, and can also improve the network access performance through local authentication of secret key and signature based on blockchain

(2) data integrity protection

guardtime developed a secret key free signature architecture (Ksi) based on blockchain technology to replace the secret key based data authentication technology. Ksi stores the hash table of the original data and files on the blockchain, runs the hash algorithm to verify other copies, and compares the results with the data stored in the blockchain. Any data tampering will be found quickly because the original hash table is stored in millions of nodes

(3) key infrastructure protection

the "Achilles heel" of the Internet, DDoS has entered the TB era, DDoS is still the simplest weapon for hackers to bring down the big target with low cost, DNS service is the primary target for hackers to carry out large-scale destruction, but blockchain technology is expected to fundamentally solve the problem

The distributed storage of

blockchain makes hacker attacks lose focus. Nebulis is developing a distributed DNS system, which uses Ethereum blockchain and interstellar Internet file system (IPFs, the distributed substitute of HTTP) to register and resolve domain names. The biggest weakness of DNS is caching, which makes DDoS attacks possible. It is also the bane of the centralized government's censorship of social networks and manipulation of DNS registration. A highly transparent and distributed DNS system can effectively prevent any entity, including the government, from arbitrarily manipulating records

(1) digital currency: improve the convenience of currency issuance and use, such as bitcoin and Ethernet in foreign countries, and guorenbao in China

from the use of physical transactions, to physical currency and credit currency, and then to the rise of bitcoin network, more and more people are aware of the distributed ledger blockchain technology behind it, and graally apply it in many scenarios other than digital currency

(2) cross border payment and settlement: realize point-to-point transaction, rece intermediate fees

transfer and payment. At present, the most mature application of blockchain technology is payment and transfer. Blockchain technology can avoid complicated systems, save the process of inter-bank reconciliation and review, and accelerate the settlement speed; Virtual currency can rece transaction costs without the intervention of clearing house. Different countries have different clearing proceres. It takes two or three days for a single remittance to arrive, which is inefficient and accounts for a large proportion of funds in transit. No longer through the third party, through the blockchain technology to form point-to-point payment. By eliminating the link of the third-party institutions, we can make full day payment, real-time payment, withdraw cash quickly and rece the hidden cost, which helps to avoid the capital risk. It is timely and convenient

(3) bills and supply chain financial business: rece human intervention, rece costs and operational risks

value transfer between point-to-point, control and verify physical bills or central system; Intermediaries will be eliminated and human intervention reced. With the improvement of efficiency, financing channels are more unblocked, risks are lower, and multiple parties benefit

(4) securities issuance and Trading: realize quasi real-time asset transfer, accelerate the speed of transaction clearing

the application of blockchain technology can make the process of securities trading more concise, transparent and fast, rece the plication of IT system, and improve the efficiency of market operation. For stocks, blockchain can eliminate paper and pen or electronic form records, rece human errors in trading, and improve the transparency and traceability of trading platform. Citigroup and Nasdaq cooperate to promote blockchain applications

(5) customer credit investigation and anti fraud: rece the cost of legal compliance, prevent financial crimes

the customer information and transaction records recorded in the blockchain help banks identify abnormal transactions and effectively prevent fraud. The technical characteristics of blockchain can change the existing credit reference system, and store the data of customers with bad records in the blockchain when the bank concts "know your customer" (KYC)

equity crowdfunding:

2. 1、 Shanghai domestic capital registration process:
business name (shop name) query - & gt; Name pre approval - & gt; Documents to be submitted for establishment registration; Application for establishment registration - & gt; Second, Shanghai domestic capital registration conditions:
1. Shareholders meet the quorum; 2
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3. The shareholders jointly formulate the articles of association
4. Having a company name and establishing an organization that meets the requirements of a limited liability company
5. There are fixed proction and operation sites and necessary proction and operation conditions< (3) list of registration documents for the establishment of a domestic limited liability company
2. Certification of all shareholders' designated representatives or jointly entrusted agents to handle the company's establishment registration
3. Articles of Association
4. A capital verification certificate issued by a legally qualified capital verification institution, note 3
5. A of the legal person's qualification certificate or natural person's identity certificate of the shareholder
6. Appointment documents and copies of identity certificates of the company's legal representative (Note 6); resolutions of the shareholders' meeting on the election of directors and supervisors; resolutions or decisions of the board of directors or executive directors on the appointment of managers (Note 5)
7. Enterprise name pre approval notice
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9. Laws and administrative regulations stipulate that the establishment of a limited liability company must be submitted for examination and approval, or if there are items in its business scope that must be submitted for examination and approval, relevant approval documents shall also be submitted
10. Other documents required by the company registration authority

remarks: the limited liability company applied to be established in the undergraate course should be a company established in accordance with the company law, with non natural person shareholders accounting for more than 50% of the shares
① if items 2 and 5 above have been submitted at the time of name pre-approval, the registration of company establishment shall be exempted< (2) the qualification certificate of the shareholder refers to: a. the of the business license of the enterprise legal person (the of the business license of the enterprise legal person in the mainland must be sealed by the instrial and commercial department in the place of registration); b. Identity certificate of natural person (foreign natural person and Hong Kong, Macao and Taiwan compatriots shall submit bank credit certificate equivalent to their investment amount at the same time); c. The registration certificate of association as a legal person, the registration certificate of institution as a legal person or the written approval; d. Other legal business certificates. Where laws, regulations and administrative rules have special provisions on the investment qualification of shareholders, their investment qualification certificates shall also be submitted
③ if the investment is made in kind, instrial property, non patented technology or land use right, the assets appraisal report issued by a legally qualified appraisal institution shall be submitted at the same time< (4) if the residence is for lease, submit the original of the house lease contract and the of the house property right certificate, or the original of the lease contract registered and sealed by the lease management department; If the residence is owned by the shareholder, the of the house property right certificate and the certificate provided by the shareholder to the company shall be submitted< (5) the names and domiciles of the directors, supervisors and managers shall be specified in the relevant resolutions or decisions< (6) if it is not specified as a , the original shall be submitted; if it is specified as a , the original shall be checked (except the of the legal representative's identity certificate)

3. Specifically, the ID card and driver's license information entered by the user will be verified. The ID card and driver's license information that have passed the verification will be identified as valid, and the ID card and driver's license information that have not passed the verification will be identified as invalid. For more wonderful application problems, you can pay attention to the central area chain service platform for real-time understanding

4. Users get bitnation & quot; through blockchain on their official website It has a significant impact on the identity authentication system

5. You should fill in your personal identity information, real name system, nickname, mobile phone number, Alipay, face sweeping, and you need to pay one yuan to verify your identity.

6. The difference between DAG blockchain and traditional blockchain is that the latter requires miners to complete proof of work (POW) to execute each transaction, and DAG blockchain can get rid of the restriction of blockchain to complete such operation. On the contrary, in the DAG blockchain, one transaction is followed by another, which means that one transaction can provide proof for the next transaction, thus ranking all the time. The connection between these transactions is DAG, just like blocks provide their names to the whole blockchain through hash value

in the traditional blockchain, each transaction takes a lot of time, while for DAG blockchain, the transaction time will become negligible

7. The core of blockchain + is to graally eliminate all instries that need intermediary to do trust. At present, many central nodes and service platforms of the Internet are essentially trust mediators. Users can do shopping, traveling, ordering, paying and so on through the trust intermediaries such as Taobao, Didi, excellent step, American group, Alipay and WeChat payment.

but the Internet has never been static, and continuous evolution is the norm. In the future, people will have new trust dependence. Because the records of the blockchain can not be tampered with and are authentic, people's trust in the blockchain graally exceeds that of the centralized company. With the joint efforts of many blockchain enterprises and some traditional instries, the world will graally transition from a centralized trust driven to a system driven by algorithms and data. When the centralized trust intermediary is graally weakened, the system represented by blockchain will graally take over the operation mode of the whole world, and finally form the "disintermediated" system trust
therefore, blockchain is not only a technology, but also a story about the paradigm shift of world operation. Although the story is still a little far away, it has sprouted and initially developed

blockchain Internet will start from the instries most closely related to trust and traceability, and graally expand and expand until most instries are blockchain oriented and blockchain +
Puyin is a high-quality Tibetan tea asset, which is stored, identified, evaluated and authorized by three parties. It is a standard digital currency issued through encryption and digitization. Puyin implements the concept of "white paper on standard digital currency" in strict accordance with its operation guidelines, and sets a standard for asset digitization

8. December 29 news, bitcoin is undoubtedly a hot topic this year, but surprisingly, although the value of bitcoin has soared in the past few weeks, but the billionaire Warren Buffett is not interested in bitcoin. Recently, Buffett finally talked about bitcoin. He said that he did not care about this proct because it is an asset that will not proce value
when talking about bitcoin, Buffett made it clear that "I can't value bitcoin because it's not an asset that generates value."
bitcoin, as a popular proct for investment, is also one of the three mainstream currencies. It has not only attracted the attention of the capital market, but also been targeted by the regulatory authorities of many countries. Israeli regulators announced this week that they would ban companies trading bitcoin from listing on the Tel Aviv Stock Exchange, and that companies already listed would also be delisted
it is understood that the reason why the Israeli regulatory authorities will take such measures is that recently many Israeli companies hope that they can join the bitcoin transaction. In an interview, Shmuel Hauser, director of the Israel securities regulatory agency, said that bitcoin seemed more like a bubble to him and could collapse at any time.
although bitcoin is not recognized, blockchain, as the underlying application of bitcoin, is a characteristic database. Based on this database, adding other applications and forming new procts will greatly surpass the existing Internet and database
blockchain is known as a black technology leading to the future Internet and a disruptive technology. The first wave of application has been set off in the financial field, which contains the idea of decentralization and the characteristics of distributed ledger, so that the blockchain has made more and more achievements in the financial instry, service-oriented instry and intelligent instry, and the value Internet is no longer just a fantasy.

9. Vias coin authentication platform improves the use efficiency of identity data, increases data security, and effectively motivates participants. It provides an ecosystem level solution for authentication.