Technology of bitcoin and Ethereum
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
although bitcoin and Ethernet are both digital currencies, unlike bitcoin, the main purpose of Ethernet is not to build itself as a payment substitute, but to facilitate and monetize the operation of Ethereum, so that developers can build and run distributed applications
The user groups of Ethernet and bitcoin are different
mahjong is the earliest application of blockchain in China:
the idea that a wants to play mahjong is equivalent to creating a block:
a calls to inform B, C and D, which means "decentralization & quot; Point to point transmission of
ABCD has formed a consensus that the touch action is "mining", and four people are "miners"
mahjong is a hash value. The Hu card is to hit the correct hash value and get the corresponding chip reward, which is called bitcoin
each of the four recorded the first round of the game. In the whole blockchain, this is only one node. If 20 mahjong games were played that day, that is, 20 nodes (blocks), and 20 blocks were connected together to form a complete ledger, that is blockchain< According to historical records, China is the world's earliest application group in blockchain, so you can be proud to say that China is more than 1000 years ahead of the world in blockchain application
it's powerful. Our country is [strong] [strong] [strong]
The next sentence: still holding the pipa half cover face. She came out slowly after a thousand calls, holding a lute in her arms and half covering her face
source: Pipa Xing by Bai Juyi in Tang Dynasty
Sentence paragraph:seeing off guests at the head of Xunyang river at night, maple leaf and silver grass blooming in autumn. The master dismounted, the passenger was on the boat, and there was no orchestra to drink. Drunk not happy, sad will leave, do not when the vast river immersion moon
when I heard the sound of Pipa on the water, the host forgot to return home. He asked the player who played the lute. Move the boat close to invite to meet, add wine back to the light to reopen the banquet. He came out with a thousand calls, and half covered his face with the lute. There are three or two tunes on the axis, and there is emotion before the tune is formed. String string cover suppress sound thought, as if to tell life not to succeed
with a low eyebrow, the letter continued to play, saying all the things in my heart. Light close slowly twist wipe pick, initially for "nishang" after "LiuYao". The big string is as loud as the rain, and the small string is as loud as a whisper. The big and small beads fall on the jade plate. Between the gate of yingyu, the bottom of the flower is slippery, and it's hard to swallow the spring under the ice. The ice spring is cold and astringent, the string is frozen, and the frozen is never heard for a while
don't worry and hate life. Silence is better than sound. The silver bottle burst, the water burst, and the iron cavalry burst out with swords and guns. At the end of the song, pay attention to the painting, and the sound of the four strings is like a split silk. The east boat and the West boat are silent, but the autumn moon is white in the middle of the river
On an autumn night, I went to the head of Xunyang River to see off a returning guest. The cold wind blows maple leaves and reed flowers, and the sound of autumn is rustling. My guests and I dismounted and held a farewell banquet on the ship. We raised our glasses to drink music that didn't help us. Wine is not happy, more sad will be separated, parting night, the vast river reflects the moon. Suddenly I heard the clear sound of Pipa on the river; I forgot to return and the guests didn't want to leavewho is playing the pipa? Pipa stopped for a long time, but it didn't move. We moved the boat closer and invited her out to meet us; Ask the servant to add wine and return to the lamp to set up the banquet again. After a thousand calls, she came out slowly, holding a lute in her arms and half covering her face. Turn the piano shaft tightly, stir the string and try to play a few times; The form is very emotional before it becomes a tune
Xianxian's sad voice implies meditation; Seems to be telling her life's failure; She kept on playing with her head down; Use the sound of the piano to express the infinite past in my heart. Gently close, slowly twist, while wipe, while pick. First play "Ni Shang Yu Yi Qu", then play "Liu Yao". Big string hunhong long, noisy, such as storm; The little strings are gentle and quiet, as if someone is whispering
clattering and cutting are playing alternately; It's like big beads and small beads falling off jade plates. The sound of Pipa is like the smooth birdsong under the flowers for a while, and it is like the difficult, low and intermittent sound of water flowing under the ice for a while. It seems that the water spring is cold and the sound of Pipa begins to condense, condenses but is not smooth, and the sound is graally interrupted
like another kind of melancholy, you hate secretly breeding; At this time, silence is more moving than sound. All of a sudden, it was like a silver bottle smashing and splashing; It's like the Armored Cavalry fighting, guns and swords. At the end of the song, she aimed at the center of the string; A roar of four strings seemed to tear the cloth. The east boat and the West boat are listening quietly; In the middle of the river is the white autumn moon
In June of the 10th year of Yuanhe (815), the assassins of Tang Dynasty's Fanzhen forces assassinated Wu Yuanheng, the prime minister, on the street of Chang'an, and injured Pei, the imperial censor. The government and the public were in a big uproar, and the Fanzhen forces further demanded that Pei be dismissed, in order to "oppose" the Fanzhen. Bai Juyi claimed that the killers should be strictly punished, which is suspected of "overstepping the post" Moreover, Bai Juyi usually wrote many allegorical poems, which offended the powerful people in the court, so he was demoted to Jiangzhou Sima. Sima was the assistant of the assassins. In the middle Tang Dynasty, most of the assassins were specially assigned "criminal" officials. This event had a great influence on Bai Juyi, which was the turning point of his ideological change. From then on, his early fighting spirit graally faded, and his negative emotions graally increased In the autumn of 816 A.D., Bai Juyi was demoted to Sima of Jiangzhou for two years. Seeing off his guests at Jiangtou, Xunyang, he ran into a singer who was abandoned because of her young and old artistic skills. She was in a depressed mood. Combined with her journey, she created the famous Pipa line with the genre of song line Second, appreciation of Pipa Xing is one of the long Yuefu Poems Written by Bai Juyi, a poet of Tang Dynasty. It was written in the 11th year of Yuanhe (816). Through the description of Pipa woman's superb playing skills and her unfortunate experience, this poem reveals the feudal society's unreasonable phenomena such as bureaucratic corruption, the decline of people's life, and the disappearance of talents. It expresses the poet's deep sympathy for her, and also expresses the poet's indignation at her innocent demotion