20m computing power

1.

1、 mining principle

at the beginning, we could dig bitcoin with the computer CPU. The founder of bitcoin, Nakamoto Tsung, g out the world's first creation block with his computer CPU. However, the era of CPU mining has long passed, and now bitcoin mining is the era of ASIC mining and large-scale cluster mining

looking back on the mining history, bitcoin mining has gone through the following five times: CPU mining → GPU mining → FPGA mining → ASIC mining → large-scale cluster mining, The mining speed changes are as follows:

CPU (20mhash / s) → GPU (400mhash / s) → FPGA (25ghash / s) → ASIC (3.5tash / s) → large scale cluster mining (3.5tash / s * x)

mining speed, which is called computing power in professional terms, that is, the ability of computer to generate hash collisions per second. In other words, how many hash collisions can our miner do per second is the calculation force. Computing power is the ability to dig bitcoin. The higher the computing power, the more bitcoin you dig, the higher the return

in the world of bitcoin, a data block is recorded about every 10 minutes. All mining computers are trying to package the data block and submit it, and the person who successfully generates the data block will get a bitcoin reward. Initially, bitcoin rewards of 50 bitcoins could be generated about every 10 minutes. But the payment is halved every four years, and now the bitcoin network can generate 25 bitcoins every 10 minutes

to successfully generate data blocks, miners need to find the effective hash value. To get the correct hash value, there is no shortcut. You can only guess. The process of guessing is the process of computer random hash collision. If you guess correctly, you will get bitcoin

Mining method: from a miner to a large-scale mine, you need to prepare a miner, a computer that can connect to the Internet, an AUC, a raspberry pie, power supply and all kinds of connecting lines, etc. The connection order of various devices is network cable - & gt; Raspberry pie - & gt; Microusb cable - & gt; AUC-> 4Pin cable - & gt; Mining machine and power supply

< EM > Figure 3: Mine Map (scale of tens of thousands of mining machines) < / EM >

nowadays, the profit space of small and medium-sized absenteeism who take one mining machine home or deploy a small family workshop (dozens of mining machines) is very limited, and the mining instry is graally concentrating on enterprises and teams with low-cost power resources and professional deployment ability

there are many factors that affect the mining revenue, such as the performance and power consumption of mining machinery, the computing power and difficulty of the whole network, the deployment and operation and maintenance capacity of the mine, the availability of low-cost electricity resources, and the currency price and policy guidance, etc. At present, excellent mining enterprises have the ability of chip research and development, a lot of computing power, professional mine deployment and operation experience, etc. in the future, resources and computing power will be more and more concentrated in these mining enterprises

2. Mine pool

in addition to the above equipment, you also need a necessary tool - mine pool. The function of the mine pool is to gather a large amount of mineral computing power, increase your probability of getting bitcoin, and at the same time, distribute your future bitcoin income to your account in advance

the simple explanation is as follows: now the bitcoin network generates a block every 10 minutes, which contains 25 bitcoins. Suppose there are 1W people in the world participating in mining, then in these 10 minutes, only one lucky person has taken these 25 bitcoins, and the others have nothing. The principle of the mine pool is that everyone mines in teams and distributes according to the agreed distribution method, so that the income of the miners' bitcoin tends to be stable and the risks of the miners are reced. Let's take the most common PPS allocation method as an example. Suppose that your computing power is 10t, and the computing power of the whole mine pool is 100t. Your computing power accounts for 1 / 10 of the total computing power of the mine pool. Suppose that the mine pool can generate 10 bitcoins a day, then you can get 1 bitcoin a day

3. Cloud computing power

in reality, the supply of mining machines often exceeds the demand, and at the same time, the delivery of mining machines needs a long waiting period. Miner installation, commissioning, maintenance and other processes are very complex, which requires a lot of energy. Miners have to enre the noise and heat of miner. For miners, the biggest cost is not these, but the high electricity charges consumed by mining. The profit space of small and medium-sized miners is getting smaller and smaller, even negative

Mining income and risk mining income can be calculated by the following formula:

Mining income = generated bitcoin * currency price - mining machinery cost - electricity fee - custody fee

if you are just a small miner, generally you only need to dect mining machinery cost and electricity fee

Mining risks are as follows:

< UL >

at present, the number of bitcoin is less than 4.5 million. If we do not issue additional bitcoin, the price of bitcoin will fluctuate, and the price callback will lead to the extension of the payback cycle

mining difficulty improvement at present, our machines can meet the market demand

the risk of power outage

< UL >

< EM >
< / EM >

2. It is defined as a special Internet commodity
at the end of 2013, the central bank and other five ministries jointly issued a bitcoin risk notice, in which bitcoin was clearly defined as a special Internet commodity, and people could buy and sell bitcoin freely at their own risk. At this stage, bitcoin should not be used as currency, and financial institutions should not provide procts or services related to bitcoin
this definition of bitcoin by the central bank and other five ministries and commissions is suitable for any kind of digital currency, including Leyte, doggy, Ruitai, Ruibo, thousand gold card and so on.

3. It is a data block connected with encrypted data to ensure that it will not be tampered with illegally. The encrypted data is calculated by the miner's mining machine.

4. It shows that the central bank has listed the digital currency based on blockchain as one of the feasible means of currency issuance in the future. The main advantages lie in the uniqueness of the key and the high efficiency of circulation, which can effectively eliminate the problems of counterfeit currency and money laundering in large amount of capital transactions.

5. < blockquote > with the rapid development of society, I believe many people have seen it; Digital currency & quot; Recently, the four major banks are concting large-scale internal testing of digital currency app, which is a preparation for the formal implementation of digital currency. The development of digital currency can be divided into three links: issuance, liquidity and security! I will elaborate from the following three aspects

it is undeniable that our government's forward-looking to digital currency is very strong. The large-scale internal test of digital currency app of the four major banks is to prepare for the arrival of digital currency. Digital currency will be more convenient and safe, controllable and value preserving than cash now; Bank insiders have been able to use digital currency app to transfer money and pay fees

the arrival of the digital currency era is inevitable, and the monetary system is slowly finalized by social development. Let's look forward to a new era

6. The acceleration of 1 block is 1 m / S ^ 2, it takes 2 s to accelerate to 2 m / s, and by displacement of 2 m, I guess you have made a mistake. It should be 20 m, not 20 cm, and it takes 9 s to keep a constant speed of 18 m behind, so the total is 11 s
2. There is no need to calculate the force at all. If the average velocity is used to calculate the displacement S = 0.5 VT = 12 * 2 = 24 m
the throwing process and acceleration are 12 m / S ^ 2, then the resistance acceleration is 2 m / S ^ 2, and the falling and acceleration are 8 m / S ^ 2, s=0.5at^2 t=2.45s