Ethereum legend
EOS is a public chain system at the bottom of blockchain developed by block. One, which is specially designed to support decentralized application of Commerce, and its code is open source
bitcoin is called blockchain 1.0 because it opens up the world of digital cryptocurrency and takes a decisive step from 0 to 1
Ethereum is known as blockchain 2.0, because it provides Turing complete virtual machine that can run smart contracts, bringing unlimited possibilities
and EOS is called blockchain 3.0, why? Two words: performance
The positioning of EOS is the slogan of its home page:English: the most powerful infrastructure for decentralized applications
Chinese: the most powerful decentralized application infrastructure
EOS expects to be an enhanced version of Ethereum, a high-throughput intelligent contract platform
although Ethereum has complete functions, it is limited by its design choice. Due to the block output speed of 15 seconds, the transaction throughput is far from large-scale practical level, which is only about 30 ~ 40tps (transaction / s). EOS, on the other hand, has chosen a different technology route, with the goal of achieving a considerable million TPS, which is quite attractive considering visa's actual processing speed of 1700tps
consensus mechanism of EOS
the reason why the throughput of bitcoin and Ethereum is so low is that they are constrained by the application scenario they envision and the consensus mechanism they choose for the scenario - both of them assume that the environment in which the system runs is totally untrustworthy, so they both adopt the consensus mechanism of proof of work
consensus, as the name suggests, is to reach a unified understanding of something - for blockchain, something refers to the confirmation of the transaction - any node to submit a transaction needs everyone's approval
the pow mechanism currently adopted by bitcoin and Ethereum is the design of the legendary Nakamoto Tsung. Under this mechanism, in order to obtain the bookkeeping right and digital currency reward, miners need to constantly dig for the compliant hash value, and confirm and package the transaction data through the consensus of hash value. POW has no access threshold, and any node has equal rights to participate in bookkeeping. Of course, the probability of winning is related to computing power:
the price of ram is based on Bancor algorithm, that is, it is regulated by market supply and demand: if the supply of ram exceeds the demand, more EOS certificates are needed to buy ram, At this time, more EOS certificates can be obtained by selling ram
memory is a consuming resource, which cannot be redeemed and can only be bought and sold. Take the issue of currency on EOS as an example. At present, the issue of currency requires 20m of memory. An EOS can buy 20KB. According to the current storage price, issuing a currency will consume 1000 EOS. This is the source of EOS memory consumption
Course Overview
this course is for friends who are interested in the development of EOS decentralized application. The course covers the core concepts of EOS DAPP development, the development and deployment of smart contracts, and how the front page interacts with EOS blockchain. Finally, a complete DAPP development based on react and EOS is completed
Chapter 1: enter the world of EOS
to understand the core concepts of EOS, such as positioning and characteristics, consensus mechanism, payment computing model, etc
Chapter 2: Hi EOS
understand the overall framework of EOS node software and the functions of node server, wallet server and command-line tools, learn how to configure and start EOS node server and wallet server, and preliminarily understand the use of command-line tools
Chapter 3: wallet, key and account
understand the three core concepts related to personal identity in EOS: wallet, key and account, and learn how to use command-line tools to create wallet, key and account
Chapter 4: development and interaction of smart contracts
understand the concept and function of smart contracts, learn how to write and compile EOS smart contracts, and learn how to deploy and interact with contracts using command-line tools
understand the persistence mechanism of state in EOS smart contract, and learn to use multi index table to save contract state
Chapter 5: issue your own tokens
learn the principle and implementation mechanism of issuing tokens on EOS, and master how to use command-line tools to issue, transfer and view the balance of tokens through practical operation
Chapter 6: use code to interact with smart contract
understand the principle of interaction between application and EOS blockchain, and learn to use JSON RPC interface and eosjs encapsulation library to access EOS blockchain
Chapter 7: DAPP development of practical notes
comprehensively use EOS knowledge, use react to complete a decentralized application of EOS notes, and learn the complete process from requirement analysis to code implementation
The above course address is as follows: EOS tutorialV God refers to V God in happy male voice
is elected by the majority of netizens, who hold the power to blackmail other judges
V God should not only have a high popularity, but also directly veto the judgment of one of the judges, directly affect the competition results, and be the VIP of the judges
{rrrrrrr}
extended materials:
the characters represented by V God:
I. in myth,
V God is a Xuanwu people in Beiping. It was born in the autumn of 1987. When he was young, he was gifted. He was often appointed a date by a university in Beijing. He was famous for his expeditions, which can be said to be noisy. Waiting for V God crown, because from the tribe is a graceful station, elegant manner, closed on shy flowers, sunken fish wild goose beauty you
Second, in the game DOTA,
V God has played an immeasurable role in the process of VP winning mym7. God V's gank power is unmatched. Even if God V starts badly. In recent games, he led the team through the suffocating gank to destroy opponents. God V can be competent for any hero, such as the moon arrow, the fearless bounty hunter, and even the witch doctor. There is no doubt that vigoss will continue to rule the DOTA community< Third, in the water king, vshen is a member of the 5th phase of the 3rd unit of arma3 armed assault of saga, a famous domestic game team. Now he has become a regular member and one of the soul figures of the unit
Third, in the economy, vitalik buterin is the founder of Ethereum. Vitalik buterin, inspired by bitcoin, put forward the idea of "next generation cryptocurrency and decentralized application platform", which began to develop through ICO crowdfunding in 2014
at the end of 2013, vitalik buterin, founder of Ethereum, released the first edition white paper of Ethereum and launched the project. From July 24, 2014, Ethereum has carried out a 42 day pre-sale of Ethereum coins
Chinese Name: he Manting
foreign name: he Manting
alias: Tu Tu Ting
Nationality: China
date of birth: July 23, 1992
Occupation: singer agency: Huayi music
height: 158CM
blood type: O
native place: Kunming
weight: 42kg
Constellation: Leo
personal file
network ID: he Manting_ Rabbit ting (network certification)
zodiac: monkey hobby: diary writing, photography, wishful thinking, singing, dancing, playing games
friends in the circle: Xu Song, xiaoximi, Weng Yiren, Tang Tian fans address: Moon rabbit
aid: Rabbit stick (12 colors)
favorite male idols: Nichkhun (nikun), Zhang Genxi Xu Song's favorite female idols: IU (Li Zhien), Jinsha, Guo Shuyao, Xianzi, Xiao Yaxuan, Jiang Yuchen
favorite combination: BY2 big mouth
favorite food: all spicy food! IKEA's meatball< Hometown: Kunming, Yunnan, China Graate School: Yunnan experimental college, Affiliated High School of Kunming University spokesperson: Ambassador of the new generation of double pride ol, After I went to Huayi to work behind the scenes, I also talked about signing the contract with me, but I didn't reach cooperation later. I signed this girl some time ago, and I wrote such a et work, so I talked about the cooperation of this song. After listening to the demo for two nights, I felt that the voice temperament was pretty good. Besides, we could talk all the time, and the cooperation would be more pleasant. So the work started in an orderly way. This song was revised four times just by arranging music, and I also demonstrated and recorded three versions of the demo. It's true that there are many female singers with better singing skills than he Manting, but everyone has made a little progress. The music instry is the same as any other instry. When you have been in a position for a long time and a new graate is transferred to take over your class, do you choose to share some work experience with him or stay away from him to prevent him from surpassing you? This is a matter of mentality. In addition, I haven't seen any of Xiao He. The recording was done in both places and then mixed by me. "
this is Xu Song's own blog. They have nothing to do with each other
it's all by hand. The main building should remember to adopt it
the climate is hot and humid in summer. When people sweat in hot weather, the watch may leave green or black marks on the wrist when it encounters sweat. Due to the different pH value in sweat, the degree of clock erosion is also different. Therefore, it is an important issue for watch lovers to take the initiative to maintain their watches
watch maintenance in summer
the reason why the watch turns green with sweat is that the watch factory adopts gold-plated copper-clad plating which is easy and beautiful in color, but if the gold-plated technology is not handled properly, it will cause the watch oxidation. Nowadays, PVD stainless steel plating technique is widely used in gold plating of watches and clocks, so it is rarely found. Therefore, it is recommended to buy stainless steel or K-gold materials. As for the problem of wrist blackening when wearing a watch, it is directly related to poor air quality and st stuck in the watch strap for a long time. In this case, it's best to give it to a professional watch shop for cleaning. You should also pay attention to the cleaning of the watch when you wear it on weekdays.
1. Huangdi (2717-2599 BC): the leader of the ancient Chinese tribal alliance and the co leader of the Chinese nation in ancient China. The head of the five emperors
is respected as the "ancestor of humanity" of China. It is said that he was the son of Shaodian and Fubao. His original surname was Gongsun. Later he changed his surname to Ji, so he was called Ji Xuanyuan. Living in Xuanyuan hill, it is called Xuanyuan family. It was built in Youxiong, also known as Youxiong family. Some people also call it "Dihong"
2. The first emperor of Qin (259-210 BC), surnamed Ying, surnamed Zhao, named Zheng, also known as Zhao Zheng, Qin Zheng, or ZuLong, was the son of King Zhuangxiang of Qin. He is a famous statesman, strategist and reformer in Chinese history. He is also the first emperor in China
Qin Shihuang was born in Handan, the capital of Zhao state, and spent his youth here. In 247 B.C., when he was 13 years old, he became king. In 238 B.C., when he was 22 years old, he held an alt coronation ceremony for the monarch in Yongcheng, the old capital of Yongcheng. He began to "manage the government personally". He got rid of LV Buwei, GA and others, and made use of Lisi and Weiliao. From 230 B.C. to 221 B.C., he successively destroyed six states, namely, Korea, Zhao, Wei, Chu, Yan and Qi
At the age of39, he completed the great cause of unifying China, established a powerful centralized country Qin Dynasty with Han nationality as the main body, and established the territory of China
Wang Mang (December 12, 45 BC to October 6, 23 BC) was born in Yuancheng, Weijun county (now Daming County, Handan, Hebei Province), a powerful minister of the Western Han Dynasty, the eldest son of Wang man, the new king of Xian, and the nephew of Wang Zhengjun, empress Xiaoyuan of the Western Han Dynasty, who usurped the throne. The founding emperor of the new dynasty was in power from 8 to 23 A.DWang Mang was an important member of Wang's family in the Western Han Dynasty. According to the concept of "orthodoxy", ancient historians believed that although he was modest, thrifty and courteous, he was actually a person fishing for fame. He has a reputation in the government and the public
At the end of the Western Han Dynasty, Wang Mang took the opportunity to steal power when Emperor AI of the Han Dynasty died early and the imperial power was lost. In December of A.D. 8, Wang Mang built a new system for the Han Dynasty. Jianyuan "started the founding of the people's Republic" and announced the implementation of the new policy, which is known as "Wang Mang's system reform" Wu Zetian (624-705, December 16) was born in Wenshui, Bingzhou (now Wenshui, Shanxi). The only orthodox female emperor in Chinese history (690-705) was also one of the oldest (67 years old) and longest lived emperors (82 years old). She was also called "lvwu" together with empress Lu of Han DynastyWu Zetian was the second daughter of Jingzhou governor. At the age of 14, he entered the harem and became a talented person of Emperor Taizong of the Tang Dynasty. He was granted the title of "Wumei". In the Tang Dynasty, Emperor Gaozong granted Zhaoyi the title of empress, honored as "Tian Hou", and called "Er Sheng" together with Emperor Gaozong. After the death of Emperor Gaozong, as emperor Zhongzong and Emperor Ruizong of Tang Dynasty, the Empress Dowager was called the imperial system
Wang Xi (303-361, 321-379), a calligrapher in the Eastern Jin Dynasty, was known as the "sage of calligraphy". Langya, a native of Linyi (now Linyi, Shandong Province), moved to Shanyin, Kuaiji (now Shaoxing, Zhejiang Province), and lived in seclusion in Jinting, Shan County in his later yearshe served as secretary Ying, general Ningyuan and governor of Jiangzhou, then as internal history of Kuaiji, leading the right general. His calligraphy is good at Li, Cao, Kai and Xing styles. He studied the style of calligraphy, imitated his hand, collected many strong points and prepared various styles. He got rid of the style of writing in Han and Wei dynasties and became his own family with far-reaching influence
when he was waiting for punishment, it is said that he once wrote a poem: & quot; He thought of Zhang Jian and waited for Dugan for a moment. I smile to the sky from the horizontal knife, leaving the liver and gallbladder& quot; In order to cover up his escape, the poem was "tampered" by Kang Youwei. The original poem is: "looking at the door, pitying Zhang Jian, admonishing Chen Shu to treat Du Gen. Throw a sword and laugh at the sky, leaving the public to be punished. "<
[editor's paragraph] life
Tan Sitong's father, Tan Jixun, once served as a doctor in the household Department of the Qing government, a governor in Daotai, Gansu Province, and a governor in Hubei Province. His mother, Xu, was born in a poor family with an instrious style, and urged Tan Sitong to study hard. When he was 10 years old, he was taught by Ouyang Zhonghu, a famous scholar in Liuyang. Under the influence of Ouyang Zhong, he became interested in Wang Fu's thought and was enlightened by patriotism. He studied extensively and was good at learning how to manage the world and help the people. His articles were very talented. He was very disgusted with the traditional eight part essay and wrote down "how unreasonable" in the textbook. He admired those wild heroes who fought against the strong and helped the weak. He once made friends with Wang Wu, a "righteous swordsman" in Beijing at that time, and they became close friends forever
in 1877, in Liuyang, he studied Chinese classics systematically and began to contact with natural sciences such as mathematics and Ge. After that, he went to Lanzhou to study in his father's Taoism department
in 1884, he ran away from home and traveled to Zhili (now Hebei), Gansu, Xinjiang, Shaanxi, Henan, Hubei, Jiangxi, Jiangsu, Anhui, Zhejiang, Shandong, Shanxi and other provinces to observe local customs and make friends with celebrities. The working people's anti feudal struggle spirit broadened his vision and made his thoughts full of struggle. In 1888, under the guidance of famous scholar Liu Renxi, he began to study Wang Fu's works carefully, drawing on the essence of democracy and materialist thinking, and extensively collecting and reading books that introced western science, history, geography and politics at that time. In 1894, the Sino Japanese War of 1894 broke out. Due to the corruption, incompetence and compromise of the Qing government, China was defeated and signed the Treaty of Shimonoseki. On May 2, 1895, Kang Youwei, together with more than 1000 people who took part in the examination in Beijing, wrote to the Qing government, demanding that he refuse peace, move the capital and reform. Tan Sitong was filled with indignation at the imperialist invasion, resolutely opposed the signing of the peace treaty, and was extremely indignant at the Qing government's compromise act of "putting up with 400 trillion people's lives". Under the influence of the trend of thought of political reform, he began to "study the changes of the world in detail for decades, and study their reasons carefully", and painstakingly studied the fundamental plan to save the nation from danger. He felt that "the trend of greatness and the inlgence of the ethos can not be recovered by keeping the tradition". Only by reforming the decadent feudal autocratic system can he save the nation from subjugation and survive
in the summer and autumn of 1897, he wrote an important book "benevolence", which was the first philosophical work of the reformers. He believes that the material "Ether" is the basis of the existence of all things in the world. All things in the world are in constant motion and change, and the root of change lies in the "likes and dislikes" of things and "similarities and differences". He defined the spiritual expression of "Ether" as "benevolence", and the content of "benevolence" is "communication", "the image of communication is equality", "benevolence communication equality" is the law of development of all things, and it is an irresistible law. In this work, he angrily attacked the "calamity and poison" caused by the feudal autocracy and the destruction and oppression of human nature by the three cardinal guides and five constant principles. It is pointed out that the feudal code of ethics is a tool used by those independent men and thieves to govern, especially the relationship between the monarch and his ministers. Therefore, for those tyrannical despots, they can not only be loyal to them, but also "kill them for everyone". At the beginning of 1898, he accepted the invitation of Chen Baozhen, governor of Hunan, who was inclined to reform, and returned to Hunan to help hold the new deal. He first strengthened the strength of the reformers in the current affairs school. Liang Qichao, who took up the post of sub teacher, arranged for Tang CAI to be a permanent Chinese teacher, and assisted Mr. Ren in teaching, vigorously publicized the theory of reform and innovation in teaching, "what he said was the theory of civil rights of the school at that time, and what he said was the truth of the Qing Dynasty, which failed.". As a result, Confucius's theories of reform, equality, and civil rights have become increasingly popular. He also sent books with nationalist consciousness, such as the records of Ming Yi waiting to visit and the ten Diaries of Yangzhou, to the students, instilling revolutionary consciousness into them, making the current affairs school a real institution for training reformers< In March 1898, he and Tang Caichang founded the southern society, a reformist group. With the aim of uniting the reform forces of the southern provinces and stressing the principles of patriotism and national salvation, the southern society "addresses the general situation of the whole country and the principles of political science". In order to strengthen the propaganda of the theory of political reform, he also founded Xiang Bao, which was the organ newspaper of the southern society and was written by him. Due to his efforts to Hunan's new deal, he is famous for "new deal talents". Shortly after Guangxu's Ming Dynasty imperial edict, someone recommended Tan Sitong to Emperor Guangxu, and Emperor Guangxu agreed to summon him. On August 21, he arrived in Beijing. On September 5, Guangxu issued an imperial edict to confer the title of minister of four grades on him, Lin Xu, Liu Guangdi and Yang Rui to participate in the new deal. The next day, Guangxu summoned him and said that he was willing to change the law, but the Empress Dowager and the conservative minister had nothing to do with it. He said, "you can play whatever you want, and I will obey. That is to say, if you blame me face to face for my fault, I will change it as soon as possible. " Tan Sitong was deeply moved by Emperor Guangxu's determination to reform and his trust in the reformers. He felt that he had a chance to realize his ambition. When he took part in politics, the struggle between the reformers and the die hards was already at full swing. Empress Dowager Cixi and others had a conspiracy to launch a mutiny at the end of October when Emperor Guangxu went to Tianjin for a military parade, depose Emperor Guangxu and put out the new deal at one stroke. On September 18, Tan Sitong paid a night visit to Yuan Shikai and asked yuan to lead his troops to Beijing to get rid of the diehards. Yuan Shikai hypocritically said that he would return to Tianjin first to get rid of Ronglu, and then lead his troops to Beijing. Yuan Shikai rushed back to Tianjin on the evening of the 20th to report to Ronglu, who secretly reported to the Empress Dowager of the West. On the 21st, the Empress Dowager launched a coup. Cixi issued a series of edicts to capture the new school of Navi. After hearing the news of the coup, he didn't panic. Regardless of his own safety, he planned to rescue Emperor Guangxu. However, all the plans failed. Under such circumstances, he was determined to die for the cause of political reform and to fight against the feudal diehards for the last time with his own sacrifice. Tan Sitong handed his letters and manuscripts to Liang Qichao, asking him to seek refuge in Japan, and said generously, "there are no travelers, no plans for the future, no dead, no calls for the future." The Japanese Embassy once sent someone to contact him, saying that they could provide him with "protection". He resolutely refused, and said to the visitor, "the political reforms of all countries have been made out of bloodshed. Today, China has never heard of anyone who has shed blood because of the political reforms, so the country is not prosperous. If so, please start with your descendants. " On the 24th, Tan Si was arrested in Liuyang guild hall. In prison, he was calm and composed, and wrote such a poem: "stop at the door, think about Zhang Jian, and wait for Dugan for a moment. I smile to the sky from the horizontal knife, leaving the liver and gall two Kunlun. On September 28, he and five other volunteers died bravely at the entrance of Caishikou, xuanwumenwai, Beijing. When they were killed, tens of thousands of people watched the execution. On his deathbed, he said aloud, "if you want to kill a thief, you can't go back to heaven. It's a good place to die. It's a good time!" It fully shows the heroic spirit of a patriot who sacrificed his life to serve his country. In 1899, his remains were transported back to his place of origin and buried at the foot of the stone mountain outside Liuyang City, Hunan Province. The couplet on the Huabiao in front of the tomb reads: "ancient times do not grind, and the vast expanse of rubble stands in heaven and earth; The mountains are straight and graceful, and the mountains rush like waves. " His work is the complete works of Tan Sitong<
Ji Yun, the character Xiaolan, the character Chunfan, the character Wanhao Shiyun, the character Daohao Guanqi Taoist. He was born in June of 1724, the second year of Yongzheng, and died in February of 1805, the tenth year of Jiaqing. He lived in Yongzheng, Qianlong and Jiaqing dynasties. He was 82 years old. His posthumous title was Wenda after his death because he was "quick and eager to learn, and he could be a writer, and he could be given the right to govern" (inscription given by Emperor Jiaqing)<
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[edit this paragraph] personal profile
Zhili hejianfu (now Xianxian county) Cui Erzhuang (now Cangxian County, Hebei Province) people (1724-1805). His ancestral home is Gengzhuang village, Shenze County, Hebei Province (now there are 1500 Ji surnames in the village, all descendants of Ji Xiaolan). In the 19th year of Emperor Qianlong, he was a Jinshi, and was also awarded the title of an Imperial Academy scholar and editor. Because of his erudition, he was appreciated by Emperor Qianlong. He was sent to Urumqi, Xinjiang, and later called back. Qianlong took ten years to complete it. He took ten years to complete it. In the next year, he was promoted to minister of the Ministry of war, left Deputy censor of the capital, Minister of rites, assistant Bachelor (his position was the deputy of the bachelor, from grade one). After his death, he was posthumously named wenda. Ji Xiaolan lives in Yuewei cottage. He wrote notes of Yuewei thatched cottage, and his posterity compiled the remains of Wenda Gong. In addition to his literary talent, he was also very famous in the Qing Dynasty, where literary inquisition was popular. For example, the owner of xiaohengxiang room said in volume 3 of the Grand View of Qing Dynasty unofficial history: "fair birth does not eat rice noodles or occasionally, but rice does not taste good. Ten plates of pork, one pot of tea and one pot of ear Volume 2 of CAI juo's "the sound of insects" says that Ji Wenda is a wild monster. He turns around and takes meat as his meal. He has no grain of rice to eat. He counts his daughters every day. Five drums, such as a court, a home, a noon, a sk, a temporary lying. Indispensable. In addition, those who take advantage of the prosperity are often lucky. Zhao gun in "Xiao Ting Za Lu" Volume 10 "(Gong) this year has 80, still lust does not decline, daily eclipse meat dozens of Jin, all day long do not eat a grain, really strange person also."
SUN Jing'an's "wild ride in Qixia Pavilion": "the great scholar of Hejian Ji is a great scholar. When I was young, I could see things in the night, and I had a unique talent. A day does not resist the female, then the skin wants to crack, the muscle wants to smoke. He edited Sikuquanshu and stayed in the inner court for several days. His eyes were red and his cheekbones were red. Pure Temple occasionally see it, surprised, asked what disease, the public to real right. He laughed and ordered two maids to accompany him. When the editor returned to his house to rest, he gave it to the second maid of honor. Wenda is so happy that he often praises people for this, which is called "taking concubines according to orders."<
Lu Xun's comments on Ji Xiaolan and notes of Yuewei thatched cottage (see Chapter 22 of a brief history of Chinese novels, fiction of Jin and Tang Dynasties in the Qing Dynasty and its tributaries)
Strange Tales from a lonely studio has been popular for more than a hundred years, and many imitators praise it