Ten thousand words long text to make clear what blockchain is
blockchain is an important concept of bitcoin. It is essentially a disintermediated 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 the information of a bitcoin network transaction, which is used to verify the effectiveness of its information (anti-counterfeiting) and generate the next block
blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies
in a narrow sense, blockchain is a kind of chain data structure that combines data blocks in a sequential way according to the time sequence, and it can not be tampered with and forged by cryptography
broadly speaking, blockchain technology uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, and uses cryptography to ensure the security of data transmission and access It is a new distributed infrastructure and computing method to program and operate data by using intelligent contract composed of automated script code
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the evolution mode of blockchain is as follows:
& 9642; Blockchain 1.0 - digital currency
▪ Blockchain 2.0 - digital assets and smart contracts
▪ Blockchain 3.0 - Implementation of distributed applications in various instries
blockchain features:
1. Disintermediation. Due to the use of Distributed Accounting and storage, there is no centralized hardware or management organization in the system, the rights and obligations of any node are equal, and the data blocks in the system are jointly maintained by the nodes with maintenance function in the whole system
2. Openness. The 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. Autonomy. Blockchain adopts 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
The information can not be tampered with. Once the information is verified and added to the blockchain, it will be stored permanently. Unless more than 51% of the 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 high5. Anonymity. Because the exchange between nodes follows a fixed algorithm, the data interaction does not need to be trusted (the program rules in the blockchain will judge whether the activity is effective). Therefore, the counterparties do not need to make the other party trust themselves by disclosing their identities, which is very helpful for the accumulation of credit
traditional banks are centralized account books, and regulators have a general ledger in their hands. We need to use a sum of money. The general ledger records the information about the change of money. If the general ledger server is hacked, or someone who has the right to modify the account book has done something wrong, then our deposit data will be wrong. That's why some customers' deposits have disappeared
the blockchain is a distributed ledger. On the blockchain, the synchronized ledger is stored on the global nodes. If it is to be modified, the technical rules of the blockchain force that more than 51% of the global server nodes must be modified. The theory is feasible, but the fact is not
banks close down at 16:30 p.m. every day. One of the things they have to do is to centralize and exchange transaction data among banks. With blockchain, this link is saved. Direct point-to-point real-time exchange
when you go to the bank to open an account and do business, the information is repeatedly provided again and again. If the user uploads the instrial and commercial data and personal data to the blockchain, a two-dimensional code can download the user's information, which is more secure and accurate, saves a lot of trouble, and greatly improves the security and efficiency
1、 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 disintermediated 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 the information of a bitcoin network transaction, Used to verify the validity of its information (anti-counterfeiting) and generate the next block
2. Application
1. Art instry
ascribe enables artists to declare ownership by using blockchain technology, issue numbered and limited edition works, and target at any type of digital form of art. It even includes a trading market where artists can buy and sell through their websites without any intermediary services
In recent years, bitproof is the most advanced application in many document time stamp applications, which will make the traditional notarization method become the past. Bitproof offers more services than free versions including blocksgin and originstaemp, including one for intellectual property. Interestingly, bitproof recently cooperated with an it school in San Francisco to put their students' academic certificates on the blockchain, completely redefining how to handle and use diplomas and student certificates Development instry colu is the first enterprise to allow other enterprises to issue digital assets. They can "token" all kinds of assets to impress many people. Although the free bitcoin wallet couperparty also allows simple tokens to be issued and traded among other wallet holders, the tokens of colu can be set with various states and types, can be detached from or returned to the system, and can be stored on BitTorrent's network when the data stored on the blockchain is too large4. Real estate instry
they plan to make the whole instry chain process more modern and solve various problems faced by everyone when participating in real estate, including naming process, land registration, agency, etc
5, Internet of things
a possible application scenario is: generate corresponding behavior through transaction, assign address to each device, inject a certain fee into the address, and perform relevant actions, so as to achieve the application of Internet of things. Similar to: PM2.5 monitoring point data acquisition, server leasing, webcam data call, DNS server, etc
6. Insurance instry in the past two years, the hottest topic in the field of science and technology can not be separated from blockchain technology. This underlying technology, born out of bitcoin, has proved its highly secure and reliable architecture and algorithm design with more than seven years of stable operation. At the same time, with innovative technologies such as distributed ledger and smart contract, it has opened up a huge imagination space for instrial upgrading of many instries. Some instry experts even predict that blockchain technology will set off the second Internet revolution
extended materials:
in 2008, Nakamoto proposed the concept of "blockchain" in the white paper on bitcoin, and established bitcoin network in 2009, developing the first block, namely "Genesis block"
the shared value system of blockchain was first imitated by many cryptocurrencies, and improved in workload proof and algorithm, such as equity proof and scrypt algorithm. Subsequently, the blockchain ecosystem has been evolving all over the world, with the emergence of ICO for the first token sale, Ethereum for smart contract blockchain, "asset token sharing economy with light ownership and heavy right to use" and blockchain countries
at present, people are using this shared value system to develop decentralized applications (DAPP) in all walks of life, and build decentralized autonomous organizations and decentralized autonomous communities (DAS) around the world
Blockchain is a special network account book. The core of blockchain technology is digital encryption. As early as 1991, a group of young people invented a new set of mutual authentication encryption technology in order not to tamper with the date of electronic documents. By means of cryptography, they concatenated and protected the concatenated text records (also known as blocks)
blockchain stores data in blocks, and each block is queued in strict order to form a "chain". If someone wants to change the content of a block, the unique characteristics of the block will also change, and the following blocks will not recognize it immediately, and the "fake" block will have to break away from the chain
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users all over the world can connect their servers to the blockchain network and become an independent node in the distributed database storage system. Once joined, the node will enjoy the same rights and obligations as all other nodes
therefore, people who carry out services on the blockchain can read and write to any node in the system. All nodes in the world will synchronize again and again according to some mechanism, so that the data of all nodes in the blockchain network is completely consistent
because of the two characteristics of immutability and decentralization. Blockchain is a good solution to the problem of trust in modern commercial society. It has emerged in financial services, Internet of things, public services, social welfare and supply chain management
Comprehensive interpretation of blockchain