Mobile registration Ethereum

1. Ethereum also uses blockchain technology, but it is more convenient to use than bitcoin's blockchain Turing, which is complete and open source. Anyone can create their own application on the basis of Ethereum

2. Yes, we can directly calculate the force on the force bee platform, and the system automatically matches the mine digging. It does not need to operate by itself. Second days excavation, third days of income automatic arrival, it is convenient and long-term stability is a good project. Details can be concerned about the official account: Jo Jo mining.

3. If your mobile phone is lost, you can report to the relevant department and register. Some Samsung models support remote control function, you can try to use this function to locate the general location of the mobile phone. How to use remote control function:
1. This function needs to enable remote control function, bind Samsung account and open mobile data through mobile phone before losing mobile phone
2. Log in to the remote control website through computer or other mobile phones
3. Enter Samsung account and password to enter the remote control website interface. Click to find my mobile phone, such as mobile networking, using this function, the mobile phone will automatically turn on the GPS function and locate
note: if the mobile phone is not connected to the network or the remote control function is not turned on, or the other party resets the mobile phone, the remote control function cannot be realized.

4. This is completely OK. The new account needs real name authentication. If you forget your password, you can get it back again.

5. Search the website of ether coin on the Internet. I have a lot of cheaters to be careful about.

6. The difference of hairy crabs between Yangcheng Lake and Suzhou

7. Never heard of it. There may be some business connections with other institutions.

8. 1. Tianjin library is open to the public and can read freely, but at the same time, it needs to abide by the rules of Tianjin library. The entry notes of Tianjin library are as follows:

entry notes

& 9830; The museum is open to the public< br />
♦ Please pay attention to the appearance. Do not wear vest, slippers or spiked shoes< br />
♦ Please store your bags and other items in the bag storage cabinet before entering the borrowing area< br />
♦ Please take the books and periodicals out of the library after going through the lending proceres. Take the books and periodicals away without authorization and handle them according to the relevant regulations< br />
♦ Please keep quiet in the library area. Do not make noise or use audio communication tools in the reading area< br />
♦ Please take good care of the documents and all public property in the library, and compensate for the damage according to the regulations< br />
♦ Smoking and open fire are strictly prohibited in the library area. Do not bring inflammables and explosives into the library< br />
♦ Please keep the library clean, do not eat in the reading area, do not spit, litter, peel and other debris< br />
♦ Please consciously abide by the rules and regulations of the library and cooperate with the staff to manage according to the regulations< If you need to borrow books, you need to apply for the reader card of Tianjin library. The proceres are as follows:
1. General rules for applying for the card

1. Readers over 14 years old can apply for the reader card of Tianjin Library for the first time by holding their second generation ID card or other valid identity documents (social security card, driver's license, military card, Hong Kong and Macao pass, Taiwan compatriots' home return card, etc.) Foreign passport), fill in personal information and pay the corresponding deposit can be free of charge

2. For children under 14 years old to apply for Tianjin library reader card for the first time, their parents should hold the children's household register, fill in their personal information and pay the corresponding deposit for free

3. handles the ID number admission system for the reader's certificate of the library, that is, ID number can only be applied for a reader's certificate (other valid documents are also the same). The reader's card is valid for one year. After the expiration, the reader only needs to register with the card for free and can continue to use it (if someone else is entrusted to handle it, the agent should handle it with his ID card and the original ID card of the client)< According to the amount of deposit or the type of readers, the reader card has the following three service functions for readers to choose to open, and the three functions are not allowed to run at the same time

1. Chinese and foreign language literature lending function: readers can borrow one foreign language book in the cultural center by paying a deposit of 500 yuan; Five volumes of Chinese books can be borrowed from the three districts of the library and the district and county public libraries that have opened the loan and return service; Five Chinese periodicals can be borrowed from the cultural center and Fukang road; Read the collection of Chinese and foreign literature< 2. Chinese literature lending function: readers can borrow 5 volumes of Chinese books in the three districts of the library and the district and county public libraries that have opened the loan service by paying a deposit of 100 yuan; Five Chinese periodicals can be borrowed from the cultural center and Fukang road; Read the collection of Chinese literature

3. Children's literature lending function: readers can borrow 2 Chinese children's books in the cultural center by paying a deposit of 50 yuan; One children's journal; Read children's literature< (1) Chinese literature lending function: readers over 14 years old with their second generation ID card can apply for the new card on the self-service card machine, If you hold other valid certificates, you need to fill in the application form at the manual application desk< (2) the function of Chinese and foreign language literature lending: readers over 14 years old should hold their second generation ID card or other valid documents and fill in the application form at the manual registration desk

(3) children's literature lending function: children under the age of 14 who apply for Tianjin library reader card for the first time must be accompanied by their parents, carry their children's household register, fill in personal information and pay the corresponding deposit for free Special note: this card can only be used in children's literature lending room< Other kinds of certificates that have expired in our library in the past: readers holding such certificates must cancel the certificate at the manual registration desk (no overe fees, book records, deposit refunds, etc.) and apply for the new certificate according to the new certificate application method< 4. Report loss, supplement and refund of deposit

1. Report loss: when a reader accidentally loses his / her reader card, he / she should immediately report loss with his / her valid certificate. During the period of report loss, the service function of the reader card (except the book return function) is temporarily closed

2. Certificate replacement: one week after the loss of the certificate is reported, the reader will apply for a new certificate with his valid certificate. If the reader's card cannot be used normally e to personal damage, the reader shall apply for a new card with his own valid certificate

3. Refund of deposit: the reader holds his ID card and reader card, and the system confirms that there is no record of overe fees and books, fills in the refund application form, and the issuing office returns the deposit to the reader, and turns off the reader card borrowing function; If the agent is entrusted, the agent shall hold his ID card and the original ID card of the client. If the reader card is lost, the reader should return the deposit one week after reporting the loss. Please keep the reader card properly after returning the deposit. If you pay the deposit again, you can resume the borrowing function< The initial password of the reader card is the last seven digits of the card number or the full card number (letter + number). Please change your password by yourself. If you forget your password, please reset it at the certification office

2. The applicant of the reader's card shall be liable for the loss of the library's literature resources e to the loss of the reader's card or the password problem

3. Readers should check the reader card and cash in person ring the process of processing the reader card

4. The library's books and periodicals are loaned out for 30 days and can be renewed once ring the period. If the borrowed Chinese books and periodicals are overe, the overe service fee will be charged at the rate of 0.20 yuan / day / volume; If the books in foreign languages are overe, the overe service fee will be charged at the rate of 0.50 yuan / day / book

3. Address and bus information of Tianjin Library:

1) bus guide of Tianjin Library (cultural center area)

Tianjin Library (cultural center area) is located at 58 Pingjiang Road, Hexi District, Tianjin
readers of the city can take the following bus lines to get off at the cultural center library station (Wenyue Beili station):

K47 Road: Xianyang North Road Xianyang North Road
655 Road: Tianjin Haihe Ecation Park No.1 bus station Tianjin Culture Square
662 Road: Shuangma bus station west Jieyuan road
668 Road: East Gate of water park Liyuan small street District bus station
NO.686: Minhang Road Shuangma bus station
no.800: Lu road Benxi road
no.835: Jialing Nanli Tanggu University of science and technology
no.868: Fuli jinmenhu bus station xuzhuangzi bus station
no.912: cultural center bus station qingcuiyuan
foreign readers can take Metro Line 3 (from Tianjin station to South Station) Get off at Wujiayao station (exit A2), walk to decayli station, take air conditioning 47 (single floor) road, and get off at cultural center library station (Wenyue Beili station)
from the west station, you can take Metro Line 1 (to Shuanglin direction), get off at xiawafang station (exit C), walk to xiawafang station, take bus 668 (or 868), and get off at cultural center library station (Wenyue Beili station)

2) Tianjin Library (Fukang road library area) bus guide

Tianjin Library (Fukang road library area) is located at No. 15, Fukang Road, Nankai District, Tianjin
readers of the city can take the following bus lines to get off at Tianjin library station:
47 No.48: Xianyang North Road Xianyang North Road (Central Ring Road)
No.95: wangdingdi North Liulin
NO.175: Yangliuqing xiawafang
No.698: yashi bus station - Lushui renrenrenrenle
No.705 (West Road): xiguanxi Shuanggang xinjiayuan bus station
no.707: haiguangsi bus station - zhangjiawojiataili
831 Road: Central Park Haitai north bus station
no.845: Liuwei road Liujing road Houtai bus station
no.862: Sixth Avenue Haitai south bus station
no.866: taiyangcheng bus station Chengjiang road bus station
no.902: dajiangli wangdingdi bus station
foreign readers can take Metro Line 3 from Tianjin station (heading for South Station) From Tianjin South Station, you can take Metro Line 3 (heading for Xiaodian); From Tianjin west station, you can take Metro Line 1 (for Shuanglin direction) to Yingkou station and transfer to Metro Line 3 (for South Station direction). Get off at zhoudeng Memorial station (exit b) and walk 1.1km northward to


3) Tianjin Library (Haihe park area) bus guide

Tianjin Library (Haihe park area) is located at No.1, Xinhui Road, Haihe Ecation Park, Jinnan District, Tianjin
local readers can get off at Haihe Ecation Park Management Center Station by taking the following bus routes:
no.655: Tianjin Culture Square - Tianjin Haihe Ecation Park No.1 bus station
No.705 (East Road): TIBEI Station - Haihe Ecation Park No.2 bus station
from Tianjin station, readers can take Metro Line 3 (heading for South Station), Get off at Yingkou station, transfer to Metro Line 1 (to Shuanglin direction), get off at Fuxingmen station (exit b), walk to Fuxingmen station, take bus 655, and get off at Haihe Ecation Park Management Center Station
from the west station, you can take Metro Line 1 (to Shuanglin), get off at Fuxingmen station (exit b), walk to Fuxingmen station, take bus 655, and get off at Haihe Ecation Park Management Center Station.

9. It can be retrieved

10.

Transaction

the behavior of blockchain transaction follows different rule sets

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e to the distributed and unlicensed nature of public blockchain, anyone can sign the transaction and broadcast it to the network

according to different blockchains, traders will be charged a certain transaction fee, which depends on the needs of users rather than the value of assets in the transaction

blockchain transactions do not require any central authority verification. It only needs to use the digital signature algorithm (DSA) corresponding to its blockchain to sign it with the private key

once a transaction is signed, broadcast to the network and mined into a successful block in the network, the transaction cannot be recovered

Ethereum transaction structure

Ethereum transaction data structure: transaction 0.1 eth

{
& 39; nonce':&# 39; 0x00', // Decimal: 0
& 39; gasLimit': &# 39; 0x5208', // Decimal system: 21000
& 39; gasPrice': &# 39; 0x3b9aca00', // Decimal system: 10000000000
& 39; to': &# 39;&# 39; ，// Sending address
& 39; value': &# 39; 0x16345785d8a0000',// 100000000000000000 ，10^17
' data': &# 39; 0x', // Decimal representation of null data; chainId': 1 / / blockchain network ID
}

these data have nothing to do with the transaction content, but have something to do with the execution mode of the transaction. This is because when you send a transaction in Ethereum, you must define some other parameters to tell miners how to handle your transaction. Transaction data structure has two attribute designs & quot; gas": & quot; gasPrice",& quot; gasLimit"

" gasPrice": The unit is Gwei, which is 1 / 1000 eth, indicating the transaction cost

& quot; gasLimit": The maximum gas charge allowed for the transaction

these two values are usually filled in automatically by the wallet provider

in addition, you need to specify which Ethereum network to execute the transaction (chainid): 1 represents the Ethereum main network

ring development, tests are usually carried out locally and on the test network, and transactions are carried out through the test eth issued by the test network to avoid economic losses. After the test, enter the main network transaction

in addition, if you need to submit some other data, you can use & quot; data" And & quot; nonce" Attach as part of a transaction

a nonce (number used only once) is the value used by Ethereum to track transactions, which helps to avoid double spending and replay attacks in the network

Ethereum transaction signature

Ethereum transaction involves ECDSA algorithm. Taking JavaScript code as an example, the popular ethers.js is used to call ECDSA algorithm for transaction signature

const ethers = require(' ethers')

const signer = new ethers.Wallet(' Wallet address

signer.signTransaction({

' nonce':&# 39; 0x00', // Decimal: 0

& 39; gasLimit': &# 39; 0x5208', // Decimal: 21000

& 39; gasPrice': &# 39; 0x3b9aca00', // Decimal 10000000000

& 39; to': &# 39;&# 39; ，// Sending address

& 39; value': &# 39; 0x16345785d8a0000',// 100000000000000000 ，10^17

' data': &# 39; 0x', // Decimal representation of null data

& 39; chainId': 1 / / blockchain network ID

})

. Then (console. Log)

you can use the online application composer to deliver signed transactions to Ethereum. This is known as "offline signature.". Offline signatures are particularly useful for applications such as status channels, which are smart contracts that track the balance between two accounts and transfer funds after a signed transaction is submitted. Offline signature is also a common practice in dexes

you can also use online wallet to create signature verification and broadcast through Ethereum account

with Portis, you can sign a transaction to interact with the gas station network (GSN)

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the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system