Blockchain side chain

1. The degree of decentralization of public chain. This kind of public blockchain, represented by bitcoin and Ethereum, is not controlled by a third party. All people in the world can read the data records on the chain, participate in transactions and compete for the bookkeeping rights of new blocks
program developers have no right to interfere with users, and each participant (i.e. node) can freely join and exit the network, and carry out relevant operations according to their wishes
private blockchain is on the contrary. The write permission of the network is fully controlled by an organization or institution, and the data read permission is regulated by the organization, either open to the outside world or with a certain degree of access restrictions
in short, it can be understood as a weakly centralized or multi centralized system. Because the participating nodes are strictly limited and few; Compared with public chain, private chain has shorter time to reach consensus, faster transaction speed, higher efficiency and lower cost
the alliance chain is a blockchain between the public chain and the private chain, which can realize "partial decentralization"
each node in the chain usually has its corresponding entity or organization; Participants join the network through authorization and form a stakeholder alliance to jointly maintain the operation of the blockchain.

2.

An important reason for the popularity of "virtual currency" in China is the lack of multi-level and multi category investment market, which makes many investors choose speculative procts such as "virtual currency"

therefore, China should also pay close attention to the construction of e-money system and virtual currency in line with the background of the times, improve the supervision of the investment market and the new financial technology system, and make good use of financial technology on the premise of preventing financial risks, so that it can better serve the real economy

in the face of the rapid development of Internet Finance and financial technology, relevant departments need to do a solid job in risk prevention and control while encouraging innovation. In order to regulate the development of this virtual commodity better and make its transaction in the market truly based on the use value, we should build special regulatory measures and even institutions for innovation such as "virtual currency" on the existing basis

3. Generally speaking, the main chain can be understood as a formal online and independent blockchain network; The side chain is not. It does not specifically refer to a blockchain, but is a general term for all blockchains that comply with the side chain protocol
the purpose of the side chain is to achieve two-way anchoring, so that some cryptocurrency can be "transferred" between the main chain and the side chain. Take bitcoin as an example: through the side chain technology, bitcoin can be "transferred" from the main chain to other blockchains, and can be used on the "transferred" blockchain. At the same time, bitcoin can safely "return" to the main chain; Bitcoin keeps the same value throughout the process. Therefore, the concept of side chain is relative to the main chain; As long as it conforms to the side chain protocol, all existing blockchains, such as Ethereum, lightcoin, zcash, etc., can become side chains
the deployment of side chain technology on the main chain means that users can use their existing assets to access the new cryptocurrency system, so as to achieve the operation purpose that cannot be achieved on the main chain. For example, using rootstock technology will enable bitcoin to conct more complex transaction operations, such as micro payment, through smart contract technology. At the same time, cryptocurrency can also expand its application scope through two-way circulation in the main chain and side chain
on the other hand, because the side chain is an independent blockchain and has its own node network, the code and data are relatively independent; So it will not increase the burden of the main chain in the process of running, to avoid the situation of excessive data expansion. However, the side chain technology is more complex, and it needs to support scripts that can be later reorganized to prove failed transactions and enough running nodes to ensure its security.

4. Generally, blockchain, especially public chain, has main network and test network. The main network is a trusted blockchain network recognized by the blockchain community, and its transaction information is recognized by all members. Effective blocks will be added to the block ledger of the main network after the consensus of the blockchain network
many people don't understand what side chain is. This concept comes from bitcoin community and was put forward in December 2013. There are some problems with the birth of bitcoin itself or the mechanism of a blockchain itself. But if you modify bitcoin protocol or chain directly, it is easy to make mistakes. Moreover, because the bitcoin block has been operating continuously, if it is wrong, the amount of funds involved will be very large, which is not allowed
in fact, sidechains do not refer to a particular blockchain, but to all blockchains that comply with the side chain protocol. This term is relative to the main chain of bitcoin
for more information, what is a side chain

5. The main chain is the underlying technology foundation of all blockchain applications, just like chips and operating systems. Whoever can become the main chain of the basic layer of the blockchain and accumulate a large number of users and scenes is likely to become the future giants such as apple and Microsoft
however, for most scenarios of using and developing blockchain, it is not necessary to re create a set of blockchain, as long as we develop our own applications based on the existing underlying blockchain or technical framework. Therefore, for the similar encryption algorithm, P2P technology, consensus algorithm, we only need to have a basic understanding, and do not need in-depth study
the primary goal of blockchain application development is to find a relatively mature underlying blockchain for application development. The underlying blockchain needs powerful and easy-to-use development interface or framework, scalability, transaction frequency, etc
Rong technology is a listed financial technology company, which currently provides main chain construction and development services http://www.erong.com/new/blockchain/backbone/index.html

6. LF supports multi-level side chain, and token is used as the main token of side chain for value circulation on all side chains. There is circulation between the side chain and the main chain, and the asset side chain is connected to the main chain. Aelf reshapes the structure between chains. The structure of eth is similar to series connection, and the solution of aelf is to change "series connection" to "parallel connection". The so-called "parallel connection" is a main chain, and then connect each branch chain on the N side. This is what the aelf team calls "mother union + n side chain Multi Chain" structure.

7.

Meituan belongs to BTC type

BTC (business to customer) is one of the categories of e-commerce according to the trading partners, which means the e-commerce of commercial institutions to consumers

this form of e-commerce is generally based on online retail instry, mainly relying on the Internet to carry out online sales activities

BTC is also called B2C. B2C mode is the earliest e-commerce mode in China

extended information:

the payment method of B2C e-commerce is the combination of cash on delivery and online payment, while most enterprises choose logistics outsourcing to save operating costs

with the change of users' consumption habits and the promotion of excellent enterprise demonstration effect, the number of online shopping users is increasing. In addition, some large-scale examinations such as the civil service examination also began to implement B2C mode

its basic needs include user management needs, customer needs and vendor needs

user management requirements: user registration and user information management

customer needs: provide electronic directory to help users search and find the goods they need

compare similar procts to help users make purchase decisions

evaluate goods, add shopping cart, place order, cancel and modify order

be able to pay online; Track the status of the order

seller's needs: check the customer's registration information

process customer orders

complete the settlement of procts purchased by customers and process customer payment

be able to publish commodity information, publish and manage online advertising

establish an interface with the bank for electronic auction

inventory management

establish interface with logistics distribution system

be able to track proct sales

to achieve customer relationship management

provide after-sales service