Ethereum public chain node server

1. At the top of Ethereum is DAPP. It exchanges with the smart contract layer through Web3. JS. All smart contracts run on EVM (Ethereum virtual machine) and use RPC calls. Below EVM and RPC are the four core contents of Ethereum, including: blockchain, consensus algorithm, mining and network layer. Except DAPP, all other parts are in the Ethereum client. The most popular Ethereum client is geth (go Ethereum)

2.

Public chain, also known as "public chain", refers to the blockchain that anyone in the world can enter the system at any time to read data, send confirmatory transactions and compete for bookkeeping. The public chain is generally considered to be "completely decentralized", because no indivial or institution can control or tamper with the reading and writing of data in it. In terms of application, blockchain public chain mainly includes bitcoin, Ethereum, super ledger, most counterfeit currencies and smart contracts. The ancestor of blockchain public chain is bitcoin blockchain, which has the following characteristics:

1, open source code

upload the code to GitHub, and everyone can get complete blockchain data by downloading, Accept the test of the public

2, complete decentralization

anyone can become a node, each node is open, everyone can participate in the calculation of the blockchain, any node is not permanent, but phased, and any center is not mandatory for nodes. Anyone can read and send transactions, and transactions can be effectively confirmed on the blockchain. Anyone can participate in the consensus process. The consensus process determines whether a block can be added to the blockchain and the exact current state. Everyone can get financial reward from it, which is proportional to their contribution to the consensus process. These public chains are generally considered to be "completely decentralized"

3. Developing decentralized applications

through this public chain, developers can easily develop centralized applications. Public chain can protect the rights and interests of users from the influence of program developers

3. Blockchain service refers to the development of public chain applications according to the infrastructure provided by the public chain, and the operation of applications to provide services. For example, using smart contract to develop public chain applications on Ethereum, and running on Ethereum nodes to provide effective services to the public. On bitcoin, we can provide some deposit services with the limited functions of bitcoin
blockchain developers should establish effective channels to collect the deficiencies of the current blockchain and make targeted improvements. This process is called improvement proposals: bitcoin isolation witness (composed of a series of BIPS) is a good example. Application layer developers can use IP process to feed back the problems found in the use process to developers, forming a virtuous circle. And IP process should not be limited to the technical field, but should go deep into the business layer
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4. Yes, but it is better to use overseas servers. In addition, the server configuration should be medium or above.

5. Generally speaking, undefined index is the exact writing problem in the process of writing. Notice generally prompts for errors that are not directly related to the execution of code, but don't forget that notice sometimes returns some rendant error information

6. How many account addresses can an Ethereum node have at most
A: generally, there is only one account address, otherwise there will be an error! Blockchain itself is unique. If there are multiple account addresses on one node, it violates the fundamental principle of blockchain!

7. There is no problem at all, but relatively speaking, we must buy some reliable ones, because we must pay attention to them.

8. This kind of virtual digital currency is very risky and unreliable. Even if you go to the stock exchange, you should not participate in it.

9. There is no doubt that Ethereum is still the absolute head of the public chain in the defi market, but it has passed the situation of Ethereum dominating alone, and the attack of coin an intelligent chain is still very fierce.

10. It is 100% global, which can well meet the business needs of China and overseas markets for technology upgrading. In the global community, there are nodes in major markets such as Britain, the United States, Japan, Australia and Canada. In addition, there are nodes in Singapore and Thailand in Southeast Asia, Israel in the Middle East, South America and Africa. BOS comes from the community, and the technical code is contributed by the global community in phase I. for details, you can go to the official website