Deep understanding of Ethereum

1.

POW: full name of proof of work

pos: proof of stake

both of them are the consensus mechanism of blockchain and the bookkeeping method of digital currency

the difference is:

1. POW mechanism: workload proof mechanism, that is, the proof of workload, is the requirement that must be met when generating a new transaction information (that is, a new block) to be added to the blockchain. In the blockchain network based on workload proof mechanism, the ability of nodes to obtain the correct numerical solution to generate blocks by calculating the numerical solution of random hash hash is the specific performance of node computing power

POS mechanism: the proof of rights and interests requires the certifier to provide a certain amount of ownership of cryptocurrency. The operation mode of the proof of rights and interests mechanism is that when creating a new block, the miners need to create a "currency right" transaction, and the transaction will send some coins to the miners themselves according to the preset proportion. According to the proportion and time of token owned by each node, the equity proof mechanism reces the mining difficulty of nodes proportionally according to the algorithm, so as to speed up the speed of searching for random numbers

extended materials:

the concept of bitcoin was first proposed by Nakamoto in 2009. According to Nakamoto's ideas, the open source software and the P2P network on it were designed and released. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system

unlike most currencies, bitcoin does not rely on specific currency institutions. It is generated by a large number of calculations based on specific algorithms. Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transactions, and uses the design of cryptography to ensure the security of all aspects of currency circulation. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin through mass proction

2. Hello, from my point of view, it should be B, because a bought a good proct, but B gave it substandard, so the resulting losses should be borne by B.
this may be found from the contract law and the losses caused by violation,

3.

Hello, my friend. These two insurance companies are among the best in China. They can be said to dominate the domestic insurance instry

then it's really difficult for these two giants to be divided into different levels. If we just look at the scale, China Life Insurance ranks first. After all, it's a state-owned enterprise, followed by Ping An. Here is a ranking table with complete data. You can learn about it: "the national ranking of insurance companies in 2020 is fresh!" First, Ping An insurance company was founded in 2002 and is a subsidiary of Ping An insurance (Group). According to authoritative data, the registered capital of Ping An Life has reached 33.8 billion yuan by the end of 2017

there are 42 branches and more than 3200 business outlets in China, with more than 1.3 million life insurance agents. In addition, Ping An insurance company ranks fourth in the fortune China top 500 in 2019, and only the instry giant China life insurance company ranks 11th

the stronger the solvency, the less need to worry about the inability to pay. Generally speaking, the CIRC has two important evaluation criteria for the solvency evaluation of insurance companies, in which the core solvency adequacy ratio should be more than 50%, and at the same time, the comprehensive solvency adequacy ratio should be more than 100%

The data of Ping An insurance is shown in the figure below:

we can see that the core solvency adequacy ratio of China Life Insurance is 272.15%, the comprehensive solvency adequacy ratio is 281.57%, and the comprehensive risk rating in the third quarter of 2019 is class A

generally speaking, China's life insurance is relatively reliable

< H2 > dad's summary:

whether it's China life insurance or Ping An insurance, the most important thing for us to buy insurance procts is whether the procts are suitable for us or not. We can't take the two companies as the first choice because of their large scale

source: Nanpa Bao