Ethereum main network server

1. Yes, but it is better to use overseas servers. In addition, the server configuration should be medium or above.

2. false

3. I plan to start a series to talk about architecture. My previous experience is mainly in the area of Internet architecture. Recently, I am sorting out and analyzing the architecture of bitcoin, Ethereum and EOS, so I am going to write a series of articles to talk about the understanding of Internet architecture and blockchain architecture. It will be divided into four articles: 1. Internet proct architecture, 2. Bitcoin architecture analysis, 3. Ethereum architecture analysis, 4. EOS architecture analysis
there is no central server in Ethereum. Instead, there are many equal nodes connected by P2P protocol, which store all the data in many nodes. When a user initiates a transaction, the transaction will be broadcast out through P2P protocol. The miner node verifies, packages and further broadcasts the transaction to the whole network. After confirmation in the blockchain, the operation is considered to be unchangeable
in the articles on blockchain on the Internet, the two words distributed and decentralized are mentioned, sometimes slightly different, sometimes mixed. The author thinks that if we want to distinguish accurately, the distributed system emphasizes that multiple components work together by sending messages, and the decentralized system emphasizes that there is no central node to control the operation of the whole system. Therefore, we think that Ethereum is both decentralized and distributed, or running a decentralized program on a distributed platform.

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

5.

The postcode of Hefei city is 230000

the new administrative and cultural zone of Hefei is located in the southwest of the main urban area of Hefei, the provincial capital, with Jinzhai Road Viact in the East, Hefei high tech Instrial Development Zone in the West and Hefei Economic and Technological Development Zone in the south. With a planning area of 12.67 square kilometers, it is an important part of the main urban area in Hefei's "141" urban space development strategy. It is also a new political and economic center and commercial and cultural center of Hefei, the provincial capital, integrating the functions of administrative office, culture, ecation and sports, Finance and trade, tourism and vacation, residence and leisure

The common information of Hefei administrative district is as follows:

1. Area: About 6km southwest of the old city center

2. Area code: (+ 86) 0551

3. Administrative division code: 340100

4. License plate code: Wan a

extended information:

located in the main direction and heart of Hefei urban development sector, the new administrative and cultural zone is the only way to connect the main urban area, economic and Technological Development zone and university town. It is 20 minutes' drive from Hefei railway station, close to Hefei West Railway Station, and adjacent to Hefei Nanjing, Hefei Xuzhou, Hefei Wuhu expressways, It's only 10 minutes' drive from Hefei Luogang airport, and the airport and station are within the "living circle" of 20 minutes. It is not only the throat of the main urban area's westward and southward expansion, but also a beautiful window to reflect the image of modern Hefei City in the demonstration area of Wanjiang city belt's undertaking instrial transfer

China's postal code adopts a four level six digit structure. The first two digits indicate the province (municipality directly under the central government or autonomous region); The first three digits indicate the postal area; The first four digits represent counties (cities); The last two digits indicate the delivery office. Postcode is to realize the implementation of automatic mail sorting scheme, because the computer can not recognize Chinese, but can recognize numbers. Code each area, can quickly use the computer sorting, to write the more detailed the better

6. If halving leads to greater difficulty in mining, then the reward will surely be higher. Because bitcoin is graally scarce, it will rise. At present, bitcoin on bitoffer is US $9300. If it is halved and doubled, the later theoretical price is US $18600. Let's give it a discount. How can it be US $15000

7. Bitcoin needs mining machine for a long time, but VPS is not powerful.
if it's a transaction, it's OK to use VPS for transit.
it's better not to touch counterfeit money

8. Usually the server will have multiple network cards, so it has the name eth0 eth1 eth2, and in some systems, the wireless network card will be named WLAN 0 WLAN 1.... Specifically, you can see the directory etc / sysconfig / network scripts. Ifcfg-eth0 represents the configuration of eth0. You change the file to eth1, and the file content is changed to eth1.. Of course, this configuration method is not applicable to all Linux systems, but it is applicable to RHEL------------------------------------------------------------------------------------------ Our own servers usually use two network cards, one for the intranet and the other for the extranet. Why do you do that? 1. From the perspective of security: the flow of the intranet is not constrained, and the flow is uncontrollable. Just like we synchronize files, we will go to intranet traffic, which often causes a sudden increase in traffic. 2. From the point of view of monitoring: distinguish the internal network and external network card to facilitate traffic monitoring.

9.

Crank 21.5

connecting rod 46.5

the solution process is as follows:

the included angle of the polar position is 36 degrees from k = 1.5, and then it is converted into the circumference angle. According to the center angle of the circle is 2x36 = 72 degrees, the diagram is drawn in turn

10. Social insurance is a kind of social and economic system that provides income or compensation for people who lose their ability to work, temporarily lose their jobs or suffer losses e to health reasons<

the social insurance plan is organized by the government, which forces a certain group to take part of their income as social insurance tax (fee) to form a social insurance fund. Under certain conditions, the insured can get fixed income or loss compensation from the fund. It is a redistribution system, and its goal is to ensure the reproction of material and labor force and social stability

when a payer applies for unit payment registration, if both tax registration and payment registration are handled at the same time, the data will be collected according to the tax registration, and there is no extra charge for payment registration. For those who have completed tax registration (including temporary registration), the following data will be collected and submitted:

1. Tax (social security payment) registration form (sf050) in plicate 2. Check the original ID card of the legal person (person in charge) and receive one

3. Check the original of the license (approval document for the establishment of public institutions) and receive one < 4. Check the original of the tax registration certificate

5<

social security process:

1,
first go to the social security agency in the jurisdiction where the local tax relationship is located to handle the insurance account opening proceres, and bring the original and of the instrial and commercial business license, or the approval document for the establishment of government organs and institutions, and the original and of the legal person certificate of public institutions; Original and of organization unified code certificate; The original and of the local tax registration certificate (not required for non tax payers); The sealed "social insurance registration form" and "instrial risk classification and fee determination form of participating instrial injury insurance units"; The original and of the legal person's ID card

2. The social security department reviews the data, goes through the new insurance registration proceres, and prints the social insurance registration certificate

3. After the new insurance registration of the unit, the new insurance registration of the employees will be handled, and the social insurance premium will be paid by the local tax department from the next month

when the relevant documents of the unit are processed, take the original and copies, and then collect the materials of the employees of the unit: of the contract, of the agricultural household registration (unemployment insurance, agricultural household registration indivials do not need to pay 1% of the payment base), original second-generation ID card (or electronic registration photo, or one inch red background registration photo), of the second-generation ID card A of the payroll (used to check whether the employee's salary is lower than the social average salary of the previous year in Shanghai, and if not, take the actual indivial salary as the payment base), etc.