IOS blockchain Technology

1. First of all, we can take a look at the official website explanation of blockchain technology. 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 is a distributed account book that can not be tampered with and forged by means of cryptography
broadly speaking, blockchain technology is a new distributed infrastructure and computing paradigm, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data
as we all know, blockchain technology is an independent underlying architecture from bitcoin system. From the perspective of architecture model, it is a set of distributed ledger, which is naturally used for bookkeeping
in the blockchain technology, if you want to generate accounting records, you need to have the transaction and flow of funds. Therefore, in the initial blockchain technology, the cryptocurrency corresponding to the main network is used as circulation goods, and the circulation transaction records of cryptocurrency between the accounts of the main network of the blockchain will be recorded on the main network
different from other transaction record databases, transaction records on the main network of blockchain technology will be recorded on all block nodes (i.e. all data blocks) in the main network, which is the so-called decentralization principle. That is to say, in blockchain technology, there is no central database to store all records, Every block on the chain has the transaction data of the whole chain, that is to say, every data block is the center
another feature of blockchain technology is that it can't be tampered with, because every transaction on the blockchain will be recorded in all blocks on the chain, so no single data block can change the record. Even if you change it, all other data blocks will also record real data, and each group of data can be traced back to the first time
because of these characteristics of blockchain technology, after the advent of bitcoin, blockchain has also attracted a lot of attention, and many people also began to want to use blockchain technology to make a centerless, traceable and unchangeable data, so as to ensure the credibility of the data
however, blockchain technology also faces many problems, such as single application scenario, non modifiable original error data, non recoverable currency stolen by hackers, etc.

2. The era of blockchain 1.0 is the era of digital currency, and the technical basis is:
1. Lianzhuang data block structure based on blocks
2. Network wide shared ledger
3. Asymmetric encryption
4. Source code open source
blockchain 2.0 era technical basis:
1. Smart contract; It is an application in the blockchain system. It is a business logic that can run automatically by coding. It usually has its own token and special development language
2. DAPP: it includes the user's applications, including but not limited to various cryptocurrencies, such as Ethereum wallet
3. Virtual machine: used to execute the compiled code of smart contract. Virtual machine is Turing complete
with the application and deepening of blockchain technology, the era of blockchain 3.0 has come. The mode of blockchain cooperation can be seen from behind the operation of all walks of life. Therefore, blockchain will change the way of human life widely and profoundly, so the whole life service will enter the era of blockchain. In the process of Internet development, blockchain + physical instry, blockchain e-commerce and blockchain community operation can be applied to blockchain technology
of course, 3.0 came into being with the development of modern cryptography. Today's applied cryptography is the result of cryptography 20 years ago. Therefore, in order to apply blockchain technology to more participation scenarios, especially in Internet economy and other aspects, more verification is needed to verify whether the existing encryption technology can meet the demand, and more in-depth integration of cryptographic frontier technology and continuous innovation are needed.

3. I don't know what you want to know, as far as blockchain 3.0 is concerned. At present, there is no accurate concept, or it is not completely determined. Most people think that DAPP technology represented by EOS will open "blockchain 3.0"
DAPP is the abbreviation of decentralized application, which translates into decentralized application, also known as distributed application. Compared with the app we are familiar with, DAPP does not rely on IOS and Android system development, but is put on the blockchain system and combined with smart contract. DAPP is to blockchain just as app is to IOS and Android
generally, different dapps will adopt different underlying blockchain development platforms and consensus mechanisms, or issue their own tokens, or use common tokens based on the same blockchain platform. However, DAPP can not be developed on all blockchains, but must use a public blockchain platform with smart contract function. It allows anyone to build and use distributed applications running through blockchain technology, such as Ethereum and EOS.

4. Calm down, only to me a rude curse, down the storm, this sentence, I pretended not to

5.

the term "regional blockchain" is more abstract and difficult to understand. After hearing this word for the first time, many people feel that it is difficult to understand. In fact, to put it simply, although it is a distributed bill that presents different transactions with different bills, this is blockchain. Of course, these are my personal views

the real blockchain needs to know how to be convenient and fast. Now the society is developing rapidly, and people have adapted to the fast pace of life, so blockchain also needs to put in its favor and know what people want

so as far as we are concerned, blockchain is an abstract term. However, with the passage and development of time, this name will become more and more familiar and graally come into our life of course, the term "blockchain" will become more and more perfect and clearer. It will not be as abstract as it is now. Of course, with the development of time, its true face will be revealed and become less mysterious. At the same time, it will come into the public's view, which is very important for the development of blockchain