CEO of blockchain
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 cryptographyin 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 blockchain1. 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 participants1. 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 obtainedtake 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 ofblockchain 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 Chinafrom 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 risksvalue 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:
Ma Huateng: blockchain, line; ICO, no way
at the two sessions, Ma Huateng said that the topic of blockchain has been very hot recently, and even some people teased that the Internet before blockchain was "classical Internet". Although blockchain technology is innovative, how to make good use of this technology is another problem
in Ma Huateng's view, blockchain technology can be applied in many fields, especially in the aspect of the uniqueness of digital authentication objects. Just like a file or bill in reality, blockchain technology can be used to ensure that they cannot be copied or tampered with. Compared with traditional IT technology in the past, blockchain has epoch-making significance in truly simulating the uniqueness of documents and receipts in real society
Ma Huateng thinks that there are still many risks in doing digital currency ICO. "If everyone can issue digital currency freely with blockchain technology, it will cause a lot of regulatory problems," he said
for example, the golden red envelope project in the 2017 Spring Festival internal test is Tencent's attempt to record users' digital assets with blockchain technology. In addition, Tencent also uses blockchain technology to rece the problem of information asymmetry
in addition to finance and public welfare, Tencent also reached a cooperation with Intel in September 2017, announcing that both sides will jointly develop blockchain technology to improve the security protection capability in the Internet of things scenario
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
The bitcoin white paper was first published at the end of 2008, when the creators sent it to multiple recipients on an encrypted mailing list. Strangely, its creator pretended to be Satoshi Nakamoto, hiding behind the pseudonym
Another reason for Nakamoto's anonymity can be explained as that the creators of alternative currencies easily put themselves at risk In 1998, Hawaiian resident Bernard von nohaus created a private currency called free dollar. It has been popular for some time, but its coinage was suddenly raided by the FBI and secret service in 2007. After a criminal lawsuit in 2009, the money was confiscated and Bernard von norhaus was convicted of "making private coins that compete with the official currency of the United States." In addition, in 2007, a digital currency called e-gold was accused of being illegal because it did not collect enough customer information. Its owner was sentenced to house arrest and the company was shut down. The arrest of entrepreneurs in alternative currencies by government agencies may have been a factor in China's decision to remain anonymouseveryone can use bitcoin. This means it can be used to pay for legal and illegal services, as well as legal bids however, it has always been a popular payment method in the black net market. Ross Ulbricht, the notorious dark Internet market maker and operator, was jailed for facilitating the trading of drugs and other contraband
Ross Ulbricht appealed to the US Supreme Court in December 2017, but is still in prison. If Nakamoto reveals his true identity, it can be inferred that he may face a similar fate
who would he be
in 2016, Craig Wright, an Australian programmer, claimed to be Chinese. He provided some evidence, but later found that it was not conclusive because it could be obtained publicly from books. He was also accused of falsifying announcements and blog posts to show his real Chinese version. For example, vitalik buterin, founder of Ethereum, recently called Craig white a liar
The other is Hal Finney. He is a famous cryptopunk and Cryptologist. He was also the first person to receive bitcoin from Nakamoto in 2009. He was also the first to download a bitcoin client. Before his death in 2014, however, Hal fini refuted the claim that he was Chinese Some people think that Nick Saab, a famous Cryptologist, may be Nakamoto. Before the launch of bitcoin, he designed the architecture of distributed digital currency, which he called bitcoin. Although the architecture has never been moved, it is similar to the design of bitcoin. This led to widespread speculation. But he repeatedly denied italthough the real identity of Nakamoto may never be disclosed, it is important that the operation of the technology will not be affected
2. I didn't sign a contract at that time. I went to the company half a year later or later to sign it. In fact, it's not a contract. It's just a trusteeship agreement. It can't prove that you bought mining machines from the company, because the company didn't sell them to you, so you can't win a lawsuit. However, if more than one person goes to sue, it will inevitably become illegal collective financing or fraud. They will either refund money or be arrested. After weighing their interests, they will definitely choose to refund the money
3. Filcoin did not participate in the official test once. I heard that by early June 2020, none of the mining machines in T4 machine room advertised by the company was Babylonian, and none of them had been put into operation
4. The chairman and CEO of the company were arrested some time ago. I don't know if they came out
5. Many investors have found that they have been cheated and filed a lawsuit against the company, which can be found in the enterprise
6. Through the lawyer's access to the company's internal materials, it was found that there was no company account, and even if the defendant had the money, he could not seal up the dirty money. The "contract event" of Xing Jiang (in the case that each miner in other provinces has signed 16t, 8t can be signed separately for Xing Jiang) shows that the internal management of the company is chaotic
7. The registered capital of the company is 10 million yuan, but there is no actual figure, which means that there is no injection of a dime.
Jay Hao himself has full faith in the reform of blockchain technology. He has said many times that blockchain technology will eliminate transaction barriers, improve efficiency, and ultimately have a significant impact on the development of the global economy. As the CEO of okex, Jay Hao said that in the future, he will lead okex to become the most reliable exchange in the instry from the three dimensions of security, innovation and trustworthiness, and drive the whole instry forward together.
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this tweet is the first in history to be issued as a non-homogeneous token (NFT), which is simply cryptocurrency. With the explosion of cryptocurrency in the world this year, people all over the world are speculation cryptocurrency, bitcoin is also a kind of cryptocurrency. So the tweet sold for $2.9 million what is NFT as the pillar of digital currency, bitcoin needs no more introction, it is a homogeneous cryptocurrency . The concept of NFT comes from this. it is also a digital currency based on blockchain technology , but compared with bitcoin's indifference and interchangeability, every NFT is unique . For example, there is only one tweet sent by Jack Dorsey at 4:50 on March 22, 2006 in the world. After making it as an NFT, except for itself, There is no absolute equivalent. In the Internet age, everything can be copied and pasted to countless copies, while NFT creates an artificial scarcity and gains value through this scarcity. In other words, NFT includes not only the work itself, but also the creator authentication information that cannot be forged, which is slightly similar to the autograph . What the buyer purchases is not the right or the right to use the work, but the ability to prove & lt; I did buy such a thing & quot; Digital voucher for{ RRRRR}