Enterprise Ethereum Alliance
bitcoin network is actually a set of distributed database, while Ethereum can be further seen as a distributed computer: the blockchain is the ROM of the computer, the contract is the program, and the miners of Ethereum are responsible for the calculation and play the role of CPU. This computer is not and can't be used for free, otherwise anyone can store all kinds of junk information and perform all kinds of trivial calculations in it. To use it, you need to pay at least the calculation fee and storage fee, as well as other expenses
the most famous enterprise Ethereum alliance was established in early 2017 by more than 20 top financial institutions and technology companies in the world, including JPMorgan Chase, Chicago Board of exchange group, Bank of New York Mellon, Thomson Reuters, Microsoft, Intel and Accenture. And Ethereum's cryptocurrency, Ethereum, has recently become a popular asset after bitcoin
money circle, one day, ten years on earth
the high housing prices destroyed the post-80s and post-90s
and then the world came back. Today's virtual currency
the post-80s also pulled back a round. Whether it is worth buying is not to see whether its current price is high or low
but to see whether it has value in the future and whether it will be useful for everyone's life There must be only a few bitcoins in total.
bitcoin has become a kind of value preservation proct corresponding to gold
decentralized anonymity advantage
bitcoin comparable to gold
moreover, more and more businesses have accepted bitcoin transactions
some institutions have also accepted bitcoin donations, and bitcoin ATM has become a hot topic Put into use
the second is
Ethereum (ETH)
it can be said that it is an evolutionary version of bitcoin
bitcoin is gold, Ethereum is silver
Ethereum's technology can be applied to real world applications
JPMorgan Chase, Microsoft, etc. are all optimistic about Ethereum technology
In my opinion, the most stable return is the twoand the other multifarious currencies have gone up and down sharply. Ordinary people's hearts can't stand
at present, domestic users can buy through this website
transactions
it's not the price rise of the currency but the price rise of the currency through the bar The number of coins is rising
the first stage: the basic theory of blockchain technology is suitable for students who have various needs for blockchain technology. It is the most comprehensive and up-to-date curriculum system at present. With the rapid appreciation of bitcoin, blockchain technology has become more and more sought after and studied by people from all walks of life, Or from the perspective of technology research and development, this set of courses are very suitable for you to download and learn. Schele: Lesson 1 ICO & amp; EOS understands the risks of ICO and ICO projects, How to judge whether an ICO is reliable lesson 2 the past and present of bitcoin blockchain understand the origin and related background knowledge of bitcoin and blockchain lesson 3 cryptography master the necessary knowledge of blockchain related cryptography lesson 4 bitcoin transaction in-depth discussion of what happened behind bitcoin transaction lesson 5 block generation and link in-depth discussion of how blockchain is generated Lesson 6 bifurcation principle of blockchain and how to operate the coins in hand before and after the bifurcation Lesson 7 how does the wallet know how much money I have and how to hold the coins in hand more safely Lesson 8 mining understanding the history and principle of mining, Experience mining in bitcoin regression test environment Lesson 9 blockchain security, understand the security problems of blockchain, how to "steal" other people's money Lesson 10 smart contract learn the principle of blockchain 2.0 smart contract, understand how the smart contract is written and run
2
stage 2: introction to blockchain technology research and development, Blockchain technology is a very popular new technology at present, which is highly praised by large IT companies and experts all over the world. Not long ago, the blockchain technology platform enterprise Ethereum Alliance (EEA) announced its formal establishment, and nearly 30 giants including JPMorgan Chase, Microsoft and Intel joined in. Extremely optimistic about the future of Ethereum. At present, the term blockchain is very popular, but few people really understand blockchain technology. If you no longer want to be a onlooker, you are welcome to learn this course. After learning this course, you can master the following contents: deeply master the blockchain technology, understand what mining is, learn how to build your own blockchain network, how to publish your own applications on your own blockchain network or enterprise Ethernet network, and how to write smart contracts, Blockchain technology applications. This course is based on practical teaching, mainly teaching front-line practical skills, to ensure that students can quickly learn to apply! Timetable: 1. Introction to blockchain 1.1 introction to blockchain technology 1.2 blockchain platform, Ethereum, an open source blockchain technology platform 1.3 Ethereum working principle, Ethereum virtual machine, account 1.4 what can Ethereum do, Blockchain technology application appreciation 1.5 Ethereum white paper 2. Client installation and operation 2.1 client installation 2.2 Ethereum account creation and management 2.3 multi signature account 2.4 Ethereum 3. Ethereum network 3.1 Ethernet network type 3.2 building local private network, User defined Genesis block 3.3 mining on local private network 4. Introction to smart contract programming 4.1 Ethereum multiple private nodes networking 4.2 multiple nodes, Introction to writing, deploying and using smart contracts 4.3 introction to development language solidy 4.4 introction to building development environment 4.5 basic variable types 5.solidy complex variable types 5.1 enumeration 5.2 structure 5.3 mapping 5.4 delete 5.5 common attributes and methods of block and transaction 6.solidy method 6.1 anonymous method 6.2 modifier 7.solidy inheritance and event 8.solidid Y programming practice 8.1 smart contract -- "vote" 9.solidy programming practice 9.1 smart contract -- "create your own token" 9.2 smart contract -- "public auction" 10.decentralized application DAPP project practice 10.1 Ethereum Web3 interface 10.2 building Ethereum online wallet 10.3 building the development framework of truss on Windows
3
Level 3 In addition to video tutorials, we have also collected a number of classic e-books for students to learn and understand the knowledge of blockchain technology. These e-books are expensive, and published relatively new, reading format is very rich, not just PDF kind, suitable for mobile phone installation of common reading software. Lesson schele: 1. How blockchain will redefine the world; 2. Blockchain Society: decoding global application and investment cases of blockchain; 3. Blockchain Revolution: how bitcoin underlying technology changes currency, technology and technology Business and the world 4. Blockchain: from digital currency to credit society 5. Blockchain: technology driven finance 6. Blockchain: Reshaping economy and the world 7. Illustrated blockchain 8. The age of artificial intelligence, A book reads block chain finance "(Internet plus era enterprise management real battle Series) 9." block chain technology guide "10." block chain: define the new pattern of future finance and economy "11." business block chain: open a new era of encryption economy "12." Accenture ":" block chain + "13." bitcoin "
Ether coin
related introction:
eth is a kind of digital token of Ethereum, which is regarded as "bitcoin version 2.0", and uses the blockchain technology "Ethereum" different from bitcoin
The system ofEthernet coin is the most widely used public blockchain system supporting complete application development. Compared with bitcoin, Ethereum belongs to the category of blockchain 2.0, which is a new blockchain system designed to solve some problems of bitcoin network
extended data
related background:
the emergence of Ethereum is to help users more easily use blockchain technology for application design. According to BARTLIN, the purpose of Ethereum is to create a more general blockchain platform, which can allow users to easily create blockchain based applications and avoid users having to build a blockchain in order to create a new application
generally speaking, the previous blockchain was only a single tool or at most a combination of multi-functional tools, while Ethereum is the smartphone of blockchain, and users can use the smartphone to build any "application" they need. Therefore, BARTLIN said that the application of blockchain is not limited to cryptocurrency. It has great potential and can be applied to all walks of life. It can bring significant benefits to enterprises and organizations of all sizes
source of reference: Internet - Ethernet currency
you can see the account balance under balance (ethers). The unit is ether
2. In the command line, geth console. Starts the control terminal of Ethereum
when & quot& gt;& quot; At the prompt, enter Web3. From Wei (ETH. Getbalance (ETH. Coinbase), & quot; ether") After that, press enter to confirm
the account balance will be displayed. The unit is ether.
there are 10 grades of steel procts: H40, J55, K55, N80, C75, L80, C90, C95, P110 and q125
proction range: oil casing
4-1 / 2 & quot
to
20 & quot
(usually seamless pipe)
button type: BTC, LTC, STC
for N80 casing, the manufacturer's proction length is R-1 (4.88-7.62m), R-2 (7.62-10.36m) and R-3 (10.36m-longer)
the surface defects of unqualified N80 casing include fish scale fold, slag inclusion fold and slag pit. When choosing the cooperative manufacturer, we should pay more attention to the time and place of the manufacturer
through negotiation between the manufacturer and the demander, submerged arc welded straight seam pipe can be used for large diameter casing (diameter greater than 508mm) used to transport natural gas, gas, oil, water and other liquids and gases
in order to rece the cost, improve the safety and prolong the service life of the casing of the demander, the type of pipe end buckle can be selected as long round thread, partial trapezoidal thread, short round thread and special buckle. The Demander shall specify the type of pipe end buckle in the contract when selecting< The mechanical properties control requirements of N80 raw materials selected by the manufacturer:
in order to make the mechanical properties of N80
grade (36Mn2V)
hot rolled seamless tube meet the API requirements, it is stipulated that the continuous casting slab is heated evenly, the starting rolling temperature is controlled at 1150 ~ 1220
℃, the rolling rhythm is well controlled, and the finishing rolling temperature is 920 ~ 950
℃< N80 oil casing pipe is a kind of seamless steel pipe with high strength and toughness.
the commonly used methods in the world are as follows:
quenching and tempering (including direct quenching and tempering after rolling), normalizing, normalizing +
tempering and tempering after rolling
36Mn2V
is a special steel for N80
grade oil casing, which belongs to microalloyed non quenched and tempered steel. The steel is suitable for processing by temperature control, cooling control and deformation control. The steel pipe can achieve the required performance without quenching and tempering, thus simplifying the proction process and recing the manufacturing cost of steel pipe
the demander's conversion of common units in the inquiry sheet of casing manufacturer: outer diameter 25.4mm = 1in, weight 1.49kg/m
= 1lb / ft, length 1m = 3.28ft.