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Why blockchain is safe,Why is blockchain so secure?

Time : 03/12/2021 Author : d2jgln Click : + -
        As a distributed technology, blockchain stores accurate copies of the chain at each network node, and the availability of information is guaranteed at all times. Therefore, if attackers want to cause a denial of service attack, they will have to cancel all network nodes, because only one node can obtain available information. In addition, since each record is agreed and all nodes contain the same information, it is almost impossible to modify it to ensure its integrity. If an attacker wants to modify the information in the block chain, he must modify the whole chain in at least 51% of the nodes. In blockchain, data is distributed on all network nodes.
 
        Without a central node, all nodes equally participate in, store and verify all information. It is a very powerful tool to transmit and store information in a reliable way. It is a kind of decentralized information and a model belonging to us, because we do not need a company to provide services. Imagine if an 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 will change. 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 its change.
 
        In fact, the attacker must simulate the hash capability of the entire network to the front of the chain. However, when the attacker attempts 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 catch up and never produce the longest chain. Therefore, this type of blockchain can resist attacks, where the attacker's hash value is less than 50%. When attackers have 51% hash value, they can rewrite the network history with a valid transaction list. This is because they can recalculate the hash value of any block sort faster than other parts of the network, so they can finally 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 indicate 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 does not include sending e69da5e6ba90e79fa5e3663 transactions, so as to get a refund. Even if the attacker has 50% hash value, the attacker can only cause so much damage. They cannot do things such as transferring money from the victim's account to their account or printing more coins. This is because all transactions are handled by accounts?? Account owners sign, so even if they control the entire network, they cannot forge account signatures.
 
        As a distributed technology, blockchain stores accurate copies of the chain at each network node, and the availability of information is guaranteed at all times. Therefore, if attackers want to cause a denial of service attack, they will have to cancel all network nodes, because only one node can obtain available information. In addition, since each record is agreed and all nodes contain the same information, it is almost impossible to modify it to ensure its integrity. If an attacker wants to modify the information in the block chain, it must be in at least 51% of the nodes. When it comes to the essence of blockchain, I believe several keywords are familiar.
 
        For example, decentralization, distrust, consensus mechanism, asymmetric encryption, distributed accounting, tamper proof, absolute transparency, openness, and so on. At the same time, some teaching posts also list the structure of blockchain, such as data layer, network layer, consensus layer, incentive layer, contract layer and application layer. However, people with clear eyes can see at a glance that there is no safety layer? In fact, several key features of blockchain have already solved the security problem. First, blockchain adopts asymmetric encryption technology. In fact, it is encryption and reconciliation. In terms of current technology, the advantage of blockchain is precisely its weakness, that is, decentralization. The distributed data structure makes its processing speed relatively slow.
 
        For example, bitcoin handles about 7 transactions per second. In reality, there are tens of thousands of payment transactions per second, and even hundreds of thousands of transactions per second during peak periods (such as holidays). Therefore, the current blockchain technology cannot support such a large transaction volume, which is also one of the important technical conditions that restrict the implementation of blockchain applications. However, just like when the car was first invented, it didn't run as fast as the carriage. Technology is forever. Recently, blockchain technology has been on fire, including the central bank, which continues to promote blockchain applications. However, the fraud of "money speculation" in the cloak of blockchain also occurs from time to time. Blockchain technology is highly professional and difficult for the public to understand, so it is easy to be "routine".
 
        In order to prevent everyone from getting caught, I have combed this tip for your reference. Blockchain ≠ Virtual currency routine: in order to attract users, some trading platforms will guide users to register with the slogan of "trading is digging money", and then let users recharge and send out virtual currency to increase the trading volume of the platform. Others disguised as "blockchain projects" and publicized early. With the continuous development of the Internet and information technology, mankind has entered the era of big data. Data has become a national basic strategic resource. Driven by the wave of informatization, government departments have accumulated more and more data closely related to people's livelihood and economy over the years, such as medical treatment, transportation, social security, etc., which are generally referred to as "government big data".
 
        Unlike the low value density of big data generated on the Internet, government big data has the characteristics of high value density. With the continuous innovation of blockchain technology, blockchain and other new generation information security technologies have mutual penetration. The advantages of blockchain in information security and digital software blockchain technology laboratory summarizes the following aspects according to its own development experience and technical characteristics: 1. Use highly redundant databases to ensure the data integrity of information; 2. Use the relevant principles of cryptography to verify the data and ensure that it cannot be tampered with; 3. In. Atoken supports EOS. There are many blockchain games in it. Those who are interested can experience it. Imtoken wallet can store Ethernet erc20 standard tokens, and hicoin can easily manage all your assets on the blockchain.
 
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