Ethereum RPC create account

1.

what is Ethereum:

Ethereum is an innovation based on the application of technologies and concepts in bitcoin to computers. Ethereum itself imitates a lot of bitcoin technology to maintain the computer platform. blockchain technology is one of them
Ethereum platform can safely run any program users want

advantages of Ethereum over other competitive currencies before Ethereum appeared, some digital currencies imitated bitcoin. However, these projects have their own shortcomings, they can only support one or several specific applications at the same time< However, the reason why Ethereum can surpass the limitations of these projects in the past is because of the core idea of Ethereum

what Ethereum wants to implement is a blockchain protocol with built-in programming language. Since it supports programming language, in theory, any blockchain application can be defined with this language, and then run on Ethereum's blockchain protocol as an application

The design of Ethereum is very flexible and adaptable

Ethereum target sets the advantages of blockchain technology, in order to add the advantages of blockchain, such as decentralization, openness and security, to almost all computing fields

blockchain applications of Ethereum

Ethereum has many blockchain applications, such as digital applications of gold and stocks, financial derivatives applications, DNS and digital authentication, etc

Ethereum has achieved more than 100 blockchain applications by many start-ups

Ethereum has also been closely watched by some financial institutions, banking consortia (such as R3), as well as large companies like Samsung, Deloitte, RWE and IBM. As a result, a number of blockchain applications such as simplified and automated financial transactions, merchant loyalty index tracking, and gift cards designed to achieve decentralization of electronic transactions have emerged

the relationship between Ethereum and blockchain:

Ethereum is a programmable blockchain

Ethereum does not give users a series of preset operations (such as bitcoin transaction), but allows users to create complex operations according to their own wishes

in this way, Ethereum can be used as a platform for various types of decentralized blockchain applications, including but not limited to cryptocurrency

like other blockchains, Ethereum also has a peer-to-peer network protocol. Ethereum blockchain database is maintained and updated by many nodes connected to the network. Each network node runs the Ethereum simulator and executes the same instructions. Therefore, people sometimes call Ethereum "world computer"

2. At the top of Ethereum is DAPP. It exchanges with the smart contract layer through Web3. JS. All smart contracts run on EVM (Ethereum virtual machine) and use RPC calls. Below EVM and RPC are the four core contents of Ethereum, including: blockchain, consensus algorithm, mining and network layer. Except DAPP, all other parts are in the Ethereum client. The most popular Ethereum client is geth (go Ethereum)

3. How to run Ethereum source code go Ethereum
install MIPS based Linux header file
$CD $prjroot / kernel
$tar - xjvf linux-2.6.38. Tar. Bz2
$CD linux-2.6.38

create an include folder under the specified path to store related header files< br />$ mkdir -p $TARGET_ Prefix / include

ensures that the Linux source code is clean
$make mrproper

generates the required header file< br />$ make ARCH=mips headers_ check
$ make ARCH=mips INSTALL_ HDR_ PATH=dest headers_ Install

all the files in dest folder to the specified include folder< br />$ cp -rv dest/include/* $TARGET_ Prefix / include

delete dest folder at last
$RM - RF dest
$LS - L $target_ PREFIX/include

4.

If you want to query the transaction records on the main network, you can use Etherscan. However, if you build your own private chain, how should you query the transaction records

the answer is that you need to listen to the logs on the chain, save them in the database, and then query them in the database. For example:

< pre t = "code" L = "Java" > varaddr = & quot& quot;< br />varfilter=web3.eth.filter({fromB lock:0 ,toBlock:' latest', address:addr });< br />filter.get(function(err,transactions){
transactions.forEach(function(tx){
vartxInfo=web3.eth.getTransaction(tx.transactionHash);
/ / at this time, the transaction information txinfo can be stored in the database
})< br />});

Web3. Eth. Filter() is used to monitor the log on the chain, and Web3. Eth. Gettransaction() is used to extract the information of the specified transaction. Once the transaction information is obtained, it can be stored in the database for query

recommend a practical introction, you can see: Ethereum tutorial

5. Because blockchain technology has natural advantages in realizing smart contracts. Bitcoin, Ruitai, Laite, Ethereum and other digital cryptocurrencies all use blockchain technology. Blockchain is an important concept of bitcoin. In essence, it is a decentralized database and the underlying technology of bitcoin. Blockchain is a chain of uses

6.

Ethereum specifies the JSON RPC API application development interface that each node needs to implement. This interface is transport independent. Applications can use this interface protocol to operate Ethereum nodes through HTTP, websocket or IPC and other communication mechanisms:

7. Using Kushen cold wallet, the private key does not touch the net to ensure the security of assets

8. The Internet has just begun, intelligent life coming

9. Driving test: B2 can be tested directly. According to the regulations, Wuhai City should apply to Wuhai City's vehicle management office for driving test. After the vehicle management office has accepted the application, it will arrange to go to a regular driving school to study and take the test< Order No.139 of the Ministry of public security of the people's Republic of China; Regulations on application and use of motor vehicle driver's license & gt; The decision of the Ministry of public security has been adopted by the minister's office meeting of the Ministry of public security, which is hereby promulgated and shall come into force as of April 1, 2016
Article 14 those who apply for a motor vehicle driver's license for the first time can apply for the following types of permitted driving: city buses, large trucks, small cars, small automatic cars, low-speed trucks, three wheeled cars, small automatic passenger cars for the disabled, ordinary three wheeled motorcycles, ordinary two wheeled motorcycles, mopeds, wheeled self-propelled vehicles, trolleybuses Motor vehicle driving license of tram eighteenth, the person applying for a motor vehicle driving license shall apply to the vehicle management according to the following provisions:
(1) where the registered residence is located, the application should be made at the place where the registered residence is located;
(two) where the residence is located outside the registered residence, the application can be made at the place of residence;
Article 19 when applying for a motor vehicle driver's license for the first time, the applicant shall fill in the application form and submit the following certificates:
(1) the identity certificate of the applicant< (2) certificates of physical conditions issued by medical institutions at or above the county level or regimental level. If it is a small automatic passenger car for the disabled, the certificate of physical condition issued by a special medical institution designated by the Provincial Department of health shall be submitted
Article 25 If the certificates and certificates submitted by the applicant are complete and in accordance with the legal form, the vehicle management office shall accept them and examine the application conditions of the applicant's motor vehicle driver's license according to the provisions
for those who meet the application requirements, the vehicle management office should arrange an appointment for the examination according to the regulations.