China blockchain sandbox technology security and application pla

1. Security in blockchain comes from some attributes< Mining blocks need to use resources< Br > 2. Each block contains the hash value of the previous block< Br > imagine if the attacker wants to change the chain by changing the transaction five blocks ago. If they tamper with the block, the hash value of the block changes. Then the attacker must change the pointer from the next block to the changed block, and then change the hash value of the next block... This will continue until the end of the chain. This means that the farther the block is behind the chain, the greater the resistance to change. In fact, the attacker has to simulate the hash capability of the whole network up to the front end of the chain. However, when the attacker tries to attack, the chain continues to move forward. If the attacker's hash value is lower than the rest of the chain (< 50%), they will always chase and never proce the longest chain. Therefore, this type of blockchain can resist attacks, where the attacker's hash value is less than 50%< Br > when attackers have 51% hash value, they can rewrite the network history with a list of valid transactions. This is because they can recalculate the hash value of any block sort faster than the rest of the network, so they can ultimately guarantee a longer chain. The main danger of 51% attacks is the possibility of double spending. This simply means that an attacker can buy an item and show that they have paid with any number of confirmations on the blockchain. Once they receive the item, they can reorder the blockchain so that it doesn't include the send transaction and get a refund< Br > even if the attacker has more than 50% hash value, the attacker can only do so much damage. They can't do things like transfer money from the victim's account to their account or print more coins. This is because all transactions are recorded by the account?? Account owners sign, so even if they control the entire network, they cannot forge account signatures.

2. The analysis of Chongqing jinwowo network is as follows:
each node on the blockchain can verify the integrity and authenticity of the account book to ensure that all transaction information is not tampered with, true and effective
every node on the blockchain keeps copies of all transaction information. When the number of data and participants on the blockchain is very large, the cost of modifying information will be very high. At least 51% of the computing power of the whole network is needed to modify information, and the modification cost may far exceed the expected revenue
when the information of some nodes is maliciously tampered with, other nodes on the blockchain will find the information that has not formed a "consensus" in a short time and maintain and update it.

3. The application scenarios of blockchain technology are diverse. Once it is popularized, the whole society will be greatly benefited
1. Financial services
the application of blockchain in the financial field has already spread out, which is not a new thing. The application of blockchain in financial technology has been widely concerned and highly valued all over the world
in mainland China, China UnionPay signed a strategic cooperation agreement on mobile payment with Bank of China in early 2018, explored cooperation in the field of blockchain, and then cooperated with Jingdong to jointly launch the "Internet financial payment security alliance risk information sharing (distributed query) platform" based on blockchain
in Hong Kong, China, the Hong Kong Monetary regulatory authority is one of the earliest regulators to launch sandbox, supporting financial innovation experiments including blockchain technology; The HKMA has also joined hands with the banking instry to launch etradeconnect, which is the first large-scale trade financing information sharing platform for Hong Kong banking instry to apply blockchain technology< On September 18, 2018, Hangzhou Internet court officially launched the chain and became the first court in the world to use blockchain for trial
it is understood that prosecutors can submit electronic evidence such as contract, rights protection process and service process details online through online complaint portal, and notarization office, forensic identification center, CA / RA organization, court and other chain nodes can witness and endorse together to provide one-stop service for prosecutors. Hangzhou Internet court of Zhejiang Province made a public judgment on a case of infringement on the right of network dissemination of works' information, and confirmed the legal effect of electronic data with blockchain technology for the first time
3. Intellectual property
blockchain and related distributed ledger technology provide the possibility for the protection and registration of intellectual property, as well as evidence in the registration stage or court litigation stage. These technologies can also speed up the above intellectual property protection and registration process in a cost-effective way
4. Logistics
in early 2018, rookie and tmall global jointly announced that blockchain technology has been used to track, upload and verify the logistics full link information of cross-border imported goods
after all nodes of the logistics chain are connected to the blockchain, the goods can be traced from manufacturers to consumers, forming a complete chain; The more links the commodity is missing, the more likely it is to be a fake proct
5. Electronic invoice
on August 10, 2018, Shenzhen International Trade revolving restaurant issued the first electronic invoice of blockchain in China. It is understood that this electronic invoice of blockchain was led by Shenzhen Taxation Bureau and provided by Tencent with underlying technology and capability
different from traditional e-invoice and simple e-invoice on the chain, this blockchain e-invoice integrates "capital flow and invoice flow", combines invoice issuing with online payment, and opens up the whole process of invoice application, invoice issuing, reimbursement and tax declaration
in addition to the above fields, the application of blockchain has broad blue ocean prospects. In the future, new technology application and development will emerge in all walks of life, and blockchain will flourish.

4. Tencent must be the security leader of the blockchain, with security guaranteed, and refine the public components of the city level blockchain application to meet the landing needs of the trusted blockchain instry in different scenarios.

5. The zodiac has already run away. Those who have joined the zodiac for a long time have earned money. Now they play the new Zodiac. Now they play the new Zodiac. The zodiac has just opened on August 1. I'll play it again. I'm very stable now,

6.

China has started to establish a national standard for blockchain to promote the construction of blockchain standard system from top-level design, which is expected to be completed by the end of 2019 at the earliest

in this regard, Zhao Wu, founder of Beijing Huashun Xin'an Technology Co., Ltd., also said that although the blockchain has disruptive technology potential, we must realize that the blockchain is still in its infancy, far from reaching the stage of subverting the world

Yu Kequn stressed that the independent and controllable blockchain network is intended not to be controlled by others technically, but also to promote the healthy development of blockchain. Security is the future life of blockchain. Only its own security can make blockchain technology landing. This requires us to pay equal attention to the development of blockchain technology and its security attributes, even ahead of time

in this regard, Li Ming also said that an important part of the standard is the information security standard, which can also see the importance of security to blockchain technology. He also pointed out that the development of blockchain standards does not mean that it will rapidly promote the development of the instry, but give the instry certain guidance. Previously, China has suffered a lot in terms of international intellectual property rights and standards. In terms of blockchain, China has formed more than 200 patents in terms of international blockchain, and even stands in the forefront of world technology. Therefore, we also need to firmly grasp our right to speak

content source: Xinhuanet

7. This is generally to okex, which is relatively large in China. The real-time market view and transaction operation are also simple.

8. TEDA currency (usdt) is a virtual currency that links cryptocurrency with legal currency US dollar. It is a kind of virtual currency kept in foreign exchange reserve account and supported by legal currency

warm tips:
① the above contents are for reference only< According to the notice and announcement issued by the people's Bank of China and other departments, virtual currency is not issued by the monetary authority, does not have legal compensation and mandatory monetary attributes, is not a real currency, does not have the same legal status as currency, cannot and should not be used as currency in the market, and citizens' investment and transaction of virtual currency are not protected by law
response time: February 2, 2021. Please refer to the official website of Ping An Bank for the latest business changes
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9. Blockchain and digital currency are two independent indivials, and the term blockchain currency does not exist. At present, the mainstream digital currencies include bitcoin, Ethereum, bitcoin, cash, grapefruit, etc. the corresponding subtitle abbreviations are BTC / eth /

10. This white paper, led by the national instrial information security development research center, has been jointly compiled by several units such as interest chain technology in four months, and has now been released. It is understood that this white paper aims to sort out the policies, regulations, technical standards and instry status of blockchain and data security governance, study and summarize the technical feasibility of the combination of blockchain and data security governance, explore the use of blockchain technology to help data security governance, provide reference for instry development, and promote the orderly development of data security governance. I hope my answer can help you