Ethereum deploys private chain
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1.1 start with imitation, First knowledge of blockchain
1.2 basis of blockchain: analysis of consensus mechanism
1.3 design principle and method of consensus mechanism
1.4 how to quickly clone a blockchain
1.5 how to turn bitcoin into its own private chain - bifurcated bitcoin
1.6 how to turn Ethereum into its own private chain - bifurcated Ethereum
1.7 how to turn ripple into its own private chain - bifurcated Ripple
1.8 how to turn stellar into a private chain of its own, How to develop your own blockchain wallet (windows and MAC) 1.11 how to develop your own blockchain wallet (Android and IOS) 1.12 how to develop an online wallet similar to blockchain.info 1.13 how to increase the security and robustness of your own blockchain network 1.14 how to use coin to handle recharge withdrawal business
1.15 How to use the fund pool to build a mixed currency service
1.16 how to design a new mining algorithm
this process is generally used, but it is also very difficult for ordinary people to complete. The mature projects of blockchain include Ethereum, decent, bitcoin and so on.
make: * * [geth] error 1
there is no such directory, or the directory has insufficient permissions
The public chain is open to all, the private chain is open to indivials who meet specific conditions, and the alliance chain is open to authorized organizations or institutions
public chain, also known as public blockchains, refers to a consensus blockchain that can be read by anyone in the world, sent by anyone, and effectively confirmed
private chain, also known as fully private blockchains, refers to the blockchain in which the write permission is completely in the hands of an organization, and all nodes participating in the blockchain will be strictly controlled
alliance chain, or alliance blockchains, refers to a blockchain that is managed by several organizations or institutions. Each organization or institution controls one or more nodes and records transaction data together. Only these organizations and institutions can read, write and send transaction data in the alliance chain
blockchain has three types: public chain, private chain and alliance chain
blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies
blockchain is an important concept of bitcoin. It is essentially a disintermediated database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains the information of a bitcoin network transaction, Used to verify the validity of its information (anti-counterfeiting) and generate the next block
< H2 > reference: blockchain networkfirst, you need to create a "Genesis" JSON configuration file, which describes some parameters of the genesis block. The following is the content of the file:
{
& quot; coinbase": & quot;& quot;,< br />" config": {< br />" homesteadBlock": 5
},
" difficulty": & quot; 0x20000",< br />" extraData": & quot; 0x",< br />" gasLimit": & quot; 0x2FEFD8",< br />" mixhash": & quot;& quot;,< br />" nonce": & quot; 0x0",< br />" parentHash": & quot; 000000000000000000000000",< br />" timestamp": & quot; 0x00",< br />" alloc": {< br />"& quot;:< br />{
" balance":& quot;& quot;
}
}
} 1234567891011213141516171819
the above code into a text file and name it genesis.json
Genesis!:
in order not to conflict with the data of the main chain, it is recommended to establish your own private chain data folder. On my computer, I built an ethdbspace as the Ethereum experimental work area on disk e, and created a privchain folder as the data storage folder of my first private chain
here, in order to facilitate management, I put genesis.json under the ethdbspace folder
open the windows command line
type the following command
geth -- dataDir & quot; E:\ EthDBSpace\ PrivChain" init " E:\ EthDBSpace\ genesis.json" 1
– the dataDir option is used to specify the data directory of our private chain. On my computer, it's E: &; EthDBSpace\ Privchain
init is the genesis command, followed by our Genesis configuration file path
after clicking enter, the execution result is as follows
at this time, genesis is complete
create an account:
in order to do experiments on the private chain, we also need to create our own account on the private chain
windows command line, type
geth -- dataDir & quot; E:\ EthDBSpace\ PrivChain" Console1
we have successfully created the world, so when we enter the client for the second time, we do not need to specify the genesis.json file path again, but directly – dataDir to indicate the private link data path
the console command is used to open the command line of geth
after clicking enter, the client will be initialized for a while. After the command prompt appears, it means that you have entered the geth console
type
personal. Newaccount (& #) in the geth command line; Your Password') 1
the personal.newaccount function is used to create an account, in which the parameter is the account password.
after clicking enter, the account creation address will be listed in green below the command, that is, the public key of the account.
we can check the account balance first, In the geth command line, type:
My = eth. Accounts [0]
eth. Getbalance (my) 12
My = eth. Accounts [0]. The purpose of this sentence is to assign the account address we just created to my variable. This can simplify the subsequent account address input. Among them, eth.accounts records the addresses of all accounts on this machine. Since we created an account for the first time, there is only one account on the computer at present. So here we use eth. Accounts [0] to extract the first account address. The eth.getbalance function is used to obtain the account balance, and the parameters are filled in the account address. The my variable here records the address of the first account
I hope my answer can help you
According to the data of okcoin, a well-known digital asset trading platform in China, yesterday, the opening price of Ethereum was 1463.00, the highest price was 1545.00 and the lowest price was 1451.01, closing at 1490.99. The closing price rose by 1.85% and the amplitude was 6.48%. Today, Ethereum opened at 1487.29, basically flat
According to analysts of okcoin, the price has shown signs of strengthening in recent trading days, with the price moving up at the low point of each adjustment. At present, the price is in a high consolidation, most of the time trading in the 1480-1530 range To sum up, the 4-hour moving average system tends to be long, and the MACD index runs in strong regions, so it is more likely that the intraday price will continue to rise after a small adjustment. Focus on 1460 first-line support within the day. If the price stops falling and rebounds near this price, it means that the market is still strong. If it falls below this price, it will weaken, or test 1420 first-line long short watershed againNASDAQ has entered into an agreement with major Swiss stock exchange operators to integrate blockchain into OTC procts and services. According to an application document released by the US Securities and Exchange Commission, NASDAQ, which has been studying blockchain technology since 2015, has reached an agreement with six Swiss Exchange, a subsidiary of six group. It is worth noting that six group is also testing blockchain technology through its SiC securities business line
the SEC document said: "in July 2017, NASDAQ signed an agreement with six Swiss Exchange to implement a solution based on distributed ledger technology for six OTC procts, and further use the NASDAQ financial framework (NFF) to promote the commercialization of blockchain technology
although it is not clear when the OTC solution will be developed and whether the deployment timeline has been formulated, this news is the latest progress of NASDAQ in promoting the commercialization of blockchain
for other blockchain projects of NASDAQ, in May this year, the stock exchange and financial giant Citibank reached a cooperation to jointly carry out blockchain payment research. Earlier, in March this year, NASDAQ revealed that it was providing blockchain technical support for a digital media contract exchange
In addition, NASDAQ also expressed its desire to invest more blockchain start-ups, and plans to invest tens of millions of dollarsNASDAQ is one of the most active exchanges in the field of blockchain in the world. In addition, the London Stock Exchange, the Hong Kong Stock Exchange and the New York Stock Exchange have publicly developed blockchain solutions. Not long ago, the London Stock Exchange, one of the world's four largest exchanges, announced its cooperation with IBM to create a blockchain securities platform for small and medium-sized enterprises. The Hong Kong Stock Exchange also announced the launch of a blockchain private stock exchange in 2018