Bitcoin EH and MH

1.

computing power is a measure of bitcoin network processing power. That is, the speed at which the computer calculates the output of the hash function. Bitcoin networks must perform intensive mathematical and encryption related operations for security purposes. For example, when the network reaches a hash rate of 10th / s, it can perform 10 trillion calculations per second

in the process of getting bitcoin through "mining", we need to find its corresponding solution M. for any 64 bit hash value, there is no fixed algorithm to find its solution M. we can only rely on computer random hash collisions. How many hash collisions can a mining machine do per second is the representative of its "computing power", and the unit is written as hash / s, This is called workload proof mechanism pow

< H2 > extended data

computing power provides a solid foundation for the development of big data, and the explosive growth of big data poses a huge challenge to the existing computing power. With the rapid accumulation of big data in the Internet era and the geometric growth of global data, the existing computing power can no longer meet the demand. According to IDC, 90% of the global information data is generated in recent years. And by 2020, about 40% of the information will be stored by cloud computing service providers, of which 1 / 3 of the data has value

therefore, the development of computing power is imminent, otherwise it will greatly restrict the development and application of artificial intelligence. There is a big gap between China and the advanced level of the world in terms of computing power and algorithm. The core of computing power is the chip. Therefore, it is necessary to increase R & D investment in the field of computing power to narrow or even catch up with the gap with the developed countries in the world

unit of force

1 KH / S = 1000 hashes per second

1 MH / S = 1000000 hashes per second

1 GH / S = 1000000000 hashes per second

1 th / S = 100000000000 hashes per second

1 pH / S = 100000000000 hashes per second

1 eh / S = 100000000000 hashes per second

2.

Bitcoin uses SHA-256 encryption algorithm. When mining, it competes with computing power. In order to improve computing power, bitcoin has gone through four stages: CPU mining, GPU mining, FPGA mining and now ASIC mining machine mining, and the degree of specialization is getting higher and higher

Ethereum uses the ethash encryption algorithm. In the process of mining, it needs to read the memory and store the DAG file. Because the bandwidth of each read memory is limited, and the existing computer technology is difficult to have a qualitative breakthrough in this problem, so no matter how to improve the computing efficiency of the computer, the memory read efficiency will not be greatly improved. Therefore, in a sense, Ethereum's ethash encryption algorithm is ASIC resistant.

different encryption algorithms lead to great differences in mining equipment and computing power between bitcoin and Ethereum

at present, bitcoin mining equipment is mainly ASIC mining machine with a very high degree of specialization. The maximum computing power of a single mining machine is 110t / s, and the scale of computing power of the whole network is more than 120eh / s

the main mining equipment of Ethereum is video card miner, and there are very few specialized ASIC miner. On the one hand, the "ASIC resistance" of Ethereum mining algorithm improves the threshold of developing ASIC miner. On the other hand, after Ethereum is upgraded to 2.0, the consensus mechanism will be transformed into POS, and the miner can not continue mining

compared with the ASIC miner, the graphics card miner has two orders of magnitude difference in computing power. At present, the computing power of mainstream graphics card miner (8 cards) is about 420mh / s, and that of Ethereum is about 230th / s.

from the time dimension of the past two years, bitcoin's computing power of the whole network is growing rapidly, while Ethereum's computing power of the whole network is growing relatively slowly

The ASIC mining machine of

bitcoin is monopolized by several major mining machine manufacturers, and miners can only buy it from the market; Although the graphics card miner of Ethereum is also manufactured by a special miner, the miner can buy accessories from the market and assemble them according to his own demand

3. Because bitcoin is based on workload proof, it is related to computing power. To have computing power, we need to consume power, so its power consumption is very large. It is precisely because of such a large power consumption that the safe and stable operation of bitcoin system can be guaranteed. "“ According to the data of btc.com website, up to now, the computing power of the whole bitcoin network is about 51.65eh/s, which is equivalent to 1.84 million bitcoin S15 (28T computing power, 1596w power) mining machines in operation, and the daily power consumption is about 69.92 million kwh. Divided by the current proction of 1800 bitcoins per day, excluding other costs, each bitcoin consumes 38800 kwh of electricity
previously, graphics cards were sold out because of the strong purchase of gold miners. The algorithm design of bitcoin is more and more difficult to dig. Therefore, the investment to dig the same bitcoin now is many times higher than a few years ago. Since the "mining" incident in Daqing Oilfield was exposed, the local police have counted the number. The average electricity cost of the mining machine seized is close to 500000 yuan in one month, and if it steals electricity, it is equivalent to making 500000 yuan in vain.

4. This address is not a bitcoin address, it should not be sent. If the transmission is successful, it can be found from the block. We can't find the balance of this address at present.

5. ∵∠BEC=∠EHC=90 ° < br />∴∠HBE+∠HEB=90 ° ∠HBE+∠HCE=90 ° < br />∴∠HEB=∠HCE
∵∠BHC=∠EHC=90 °< br />∴△ BHE∽△EHC
∴HB/HE=HE/HC
∴HE × HE=HB × HC
∵∠BDC=∠CHM=90 ° < br />∴∠BCD+∠CBD=90 ° ∠CMH+∠BCD=90 ° < br />∴∠CBD=∠CHM
∵∠BHG=∠MHC=90 °< br />∴△BHG ∽△MHC
∴HB/HM=HG/HC
∴HG × HM=HB × HC
∴HE × HE=HG × HM

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6. 解答：证明：∵CE⊥AC，EH⊥BC，
∴∠EHB=∠EHC=90°，∠BEC=90°，
∴∠EBH+∠BEH=90°，∠BEH+∠CEH=90°，
∴∠EBH=∠CEH，HBHM，
∴HG?HM=CH?HB，
∴HE²=HG?HM．