区块链是不可篡改的吗,区块链不可篡改的技术特征是由什么技术奠定的

区块链是不可篡改的，这是由一系列技术奠定的基础，其中三个关键技术是：分布式账本技术、共识算法和加密算法。

首先是分布式账本技术，它是区块链技术的核心，是一种分布式数据库技术，其特点是数据存储在多个节点上，每个节点都可以查看整个账本的数据，而且每个节点都可以对账本进行修改，但是修改必须经过其他节点的确认，确认通过之后才能生效，这样就保证了数据的安全性和可靠性，也就是所谓的不可篡改。

其次是共识算法，这是一种多方协商的算法，用于让多个节点之间达成共识，从而保证数据的一致性。常见的共识算法有工作量证明算法（Proof of Work）、权益证明算法（Proof of Stake）和线性阶段算法（Linear Phase Algorithm）等，它们都可以用来保证数据的安全性和可靠性，也就是不可篡改性。

最后是加密算法，它是一种数字签名技术，可以用来确认数据的完整性和真实性，即确保数据不被篡改。常见的加密算法有RSA、DSA、ECDSA和Ecc等，它们都可以用来确保数据的完整性和真实性，从而保证数据的安全性和可靠性，也就是不可篡改性。

总的来说，分布式账本技术、共识算法和加密算法是区块链不可篡改性的基础，它们可以用来保证数据的安全性和可靠性，从而确保区块链的不可篡改性。

1. The technical characteristics of blockchain include: ( ). a Decentralization b Traceability c Openness and transparency d Non-tampering

The technical characteristics of blockchain include decentralization, non-tampering, consensus trust mechanism, openness, anonymity, cross-platform, etc.

6. Cross-platform

Similar to the TCP/IP protocol of the Internet, blockchain can also be regarded as a basic communication protocol. The cooperation of other mechanisms together constitutes the value Internet based on blockchain. Nodes on the blockchain network operate independently based on common algorithms and data structures. They mainly consume computing resources and have nothing to do with the platform. Computing nodes can be deployed on any platform.

It can be said that the characteristics and development of blockchain come from the soil where it was born - the development of Internet technology and the rise of cloud computing and big data.

2. Why the blockchain cannot be tampered and analyze its basic principles

The working principle of the blockchain that cannot be tampered is What? To understand this, we need to introduce a concept: hash algorithm. There are many types of hash algorithms, and their basic function is to convert a data file of any length into a unique corresponding fixed-length string.

You can understand that any file will generate a string of fixed-length garbled tags.

This algorithm is irreversible, that is, when you get the label, you cannot reversely deduce the original data file.

If there are subtle changes in the data file, such as adding a punctuation mark, then after rehashing, the new tags will be very different from the original tags.

It is impossible to infer what happened to the data file from the difference between the old and new tags. Therefore, it is easy to verify whether a certain file existed at a certain moment, or whether two files are the same.

It is this irreversibility that determines the irreversibility of the blockchain. In each block, in addition to the transfer transaction data within ten minutes, there is also a block header.

The header contains the hash of the previous block's data. These hashes are nested layer by layer with a fixed length, and finally all blocks are concatenated to form a blockchain. The blockchain contains all transactions and new currency issuances that have occurred since the inception of the chain.

If I were a bad person, I would tamper with the agreement. Include the sender and receiver of the transaction and the amount transferred. A sender can send Bitcoins all the way back to the earliest newly issued block of the currency.

The legitimacy of the sender's possession of these Bitcoins is guaranteed by the currency's original issuance block record and all historical transaction records related to the currency.

Therefore, tampering with one transaction means that all subsequent hashes and related transaction records will have to be tampered with again, which requires extremely high computing power and difficulty.The probability of success is zero.

3. Encyclopedia: How to understand the immutability of blockchain

Blockchain technology is also called distributed ledger technology.

In the blockchain, since everyone (computer) has exactly the same ledger, and everyone (computer) has completely equal rights, there will be no loss of contact due to a single person (computer) Or crash, causing the entire system to collapse.

Since there are exactly the same ledgers, it means that all data is open and transparent, and everyone can see the digital changes in each account.

Its very interesting feature is that the data in it cannot be tampered with. Because the system will automatically compare, it will consider the account books with the largest number of the same number as the real account books, and the small number of account books with different numbers as others are false account books.

In this case, it makes no sense for anyone to tamper with their own ledger, because unless you can tamper with most of the nodes in the entire system.

If the entire system has only five or ten nodes, it may be easy to do, but if there are tens of thousands or even hundreds of thousands of nodes, and they are distributed in any corner of the Internet, unless someone Can control most computers in the world, otherwise it would be impossible to tamper with such a large blockchain

4. What are the advantages of blockchain

Decentralized, non-tamperable, and convenient Efficient.
Blockchain is a distributed ledger technology that has the following advantages:
1. Decentralization: Blockchain is a distributed system that does not rely on any central organization or individual. This makes the blockchain more secure and stable, making it less likely to be destroyed or attacked.
2. Untamperable: Blockchain uses cryptography technology to ensure the security and reliability of data. Once the data is written to the blockchain, it cannot be tampered with. This makes blockchain very suitable for recording important transaction records or other data.
3. High efficiency: The distributed architecture of the blockchain enables it to quickly process a large number of transactions without relying on any centralized agency coordination. This makes blockchain very suitable for large-scale financial transactions or other data processing tasks.
4. Privacy protection: Blockchain can use anonymous accounts or other technologies to protect users' privacy, so that users do not need to worry about the leakage of their personal information when using the blockchain.
In general, blockchain has the advantages of decentralization, non-tampering, high efficiency, and privacy protection, so it has been widely used in finance, logistics, medical and other fields.

5. The key to the non-tamperability of the blockchain is

Each block header of the blockchain is encapsulated with the hash code of the previous block. This mechanism ensures that the block Blockchain data cannot be tampered withlevy.
Blockchain is the current development trend of the technology industry. "Decentralization" and "non-tampering" are the technical advantages that ordinary people can blurt out. “Decentralization” is well understood as a non-centralized and unorganized action. However, judging from the current development, the application of blockchain technology is still relatively weak and multi-center.

6. What is blockchain

Blockchain is a new application model of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism, and encryption algorithm. Blockchain is an important concept of Bitcoin.

It is essentially a decentralized database, and as the underlying technology of Bitcoin, it is a series of data blocks generated using cryptographic methods. Each block of data contains a The information of batches of Bitcoin network transactions is used to verify the validity of its information (anti-counterfeiting) and generate the next block.

(6) Blockchain is non-tamperable Extended reading

Characteristics of blockchain:

1. Certificate storage

The "non-tamperable" feature of blockchain provides a solution to the problem of "certificate storage" in economic and social development. As long as the authenticity of the on-chain information and data can be ensured, the blockchain can solve the problem of "storage" and "certification" of information.

For example, in the field of copyright, blockchain can be used to store electronic evidence, which can ensure that it is not tampered with, and can link original platforms, copyright bureaus, judicial agencies and other parties through distributed ledgers. The banquet greatly improves the efficiency of Yinxin Bank in handling infringements.

2. Sharing

The "distributed" characteristics of the blockchain can break through the "data barriers" between departments and achieve information and data sharing. Different from centralized data storage, the information on the blockchain will be distributed to each node through point-to-point broadcasting, and all information can be "truthfully recorded" through "whole network witness".

7. Reasons why blockchain cannot be tampered

1. Transactions cannot be tampered
2. Block bodies cannot be tampered
3. Block headers cannot be tampered with
4. The blockchain cannot be tampered
Extended information:
1. The consensus mechanism of the blockchain has the characteristics of "the minority obeys the majority" and "everyone is equal". Among them, "the minority obeys the majority" does not It does not entirely refer to the number of nodes, but also to computing power, number of shares, or other characteristics that computers can compare. "Everyone is equal" means that when a node meets the conditions, all nodes have the right to give priority to the consensus result, which will be directly recognized by other nodes and may eventually become the final consensus result. Taking Bitcoin as an example, it uses proof of work. Only when more than 51% of the accounting nodes in the entire network are controlled, it is possible to forge a non-existent record. When there are enough nodes joining the blockchain, this is basically impossible, thus eliminating the possibility of fraud
2. Smart contracts are based on these trustworthy and non-tamperable data, which canAutomatically execute some predefined rules and terms. Take insurance as an example. If everyone's information (including medical information and risk occurrence information) is true and trustworthy, it will be easy to automate claims settlement in some standardized insurance products. In the daily business of insurance companies, although transactions are not as frequent as those in the banking and securities industries, the reliance on trusted data continues unabated. Therefore, the author believes that using blockchain technology from the perspective of data management can effectively help insurance companies improve their risk management capabilities. Specifically speaking, it is mainly divided into risk management of policyholders and risk supervision of insurance companies
3. The blockchain has a scattered network hierarchical structure connected by nodes, which can realize the comprehensive transmission of information throughout the network and can verify the information. degree of accuracy. This feature improves the convenience and intelligence of IoT transactions to a certain extent. The blockchain + big data solution utilizes the automatic filtering mode of big data to establish credit resources in the blockchain, which can double improve the security of transactions and improve the convenience of IoT transactions. Save time and cost for smart logistics model applications. Blockchain nodes have very free entry and exit capabilities and can independently participate in or leave the blockchain system without any interference to the entire blockchain system. Blockchain + big data solutions take advantage of the integration capabilities of big data to make the basic user expansion of the Internet of Things more directional and facilitate user expansion among dispersed users of smart logistics

8. Area What are the characteristics of the blockchain?

The characteristics of the blockchain are:

1. It cannot be tampered

The easiest thing to understand about the blockchain Properties are properties that cannot be tampered with. Immutability is based on the unique ledger of "block + chain": blocks containing transactions are continuously added to the end of the chain in chronological order. To modify the data in a block, all blocks after it need to be regenerated.

2. Uniqueness required to express value

Whether it is an interchangeable token (ERC20), a non-interchangeable token (ERC721), or other proposals The token standards and Ethereum tokens all demonstrate an important feature of the blockchain: the uniqueness required to represent value. In the digital world, the most basic unit is a bit, and the fundamental characteristic of a bit is that it can be copied. But the value cannot be copied, the value must be unique.

3. Smart contracts

From Bitcoin to Ethereum, the biggest change in the blockchain is the "smart contract". The Bitcoin system is designed for a digital currency, and its UTXOs and scripts can also handle some complex transactions, but they have significant limitations. When Vitalik created the Ethereum blockchain, his core goals revolved around smart contracts: a Turing-complete scripting language, a virtual machine (EVM) to run smart contracts, and a series of subsequent developments. Standardized smart contracts for different types of tokens, etc.

4. Decentralized self-organization

The fourth major feature of the blockchain is decentralized self-organization. So far, the organization and operations of major blockchain projects have been closely tied to this characteristic. Many people’s ideal expectation for blockchain projects is that they become a community or ecosystem that operates autonomously.

5. Openness.

The foundation of blockchain technology is open source. In addition to the private information of the transaction parties being encrypted, the blockchain data is open to everyone. Anyone can query the blockchain data through the public interface. and develop related applications, so the entire system information is highly transparent.